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Lentinus
Lentinus
Lentinus
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Lentinus
Lentinus tigrinus, Italy
Scientific classification Edit this classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Polyporales
Family: Polyporaceae
Genus: Lentinus
Fr. (1825)[1]
Type species
Lentinus crinitus
(L.) Fr. (1825)
Synonyms[2]

Lentinus is a genus of fungi in the family Polyporaceae. The genus is widely distributed, with many species found in subtropical regions.[3]

The genus name Lentinus is derived from the Latin lent, meaning "pliable", and inus, meaning "resembling".

Species

[edit]
Lentinus berteroi
Lentinus squarrosulus
Lentinus swartzii

As of July 2017, Index Fungorum accepts 120 species of Lentinus.[4] The genus includes:

Some molecular studies showed that some Polyporus species belong to the Lentinus-radiation.[7]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Lentinus

View on Grokipedia
from Grokipedia
Lentinus is a of basidiomycete fungi in the family , characterized by wood-decaying, saprophytic that produce leathery to tough fruitbodies with decurrent lamellae and a dimitic to trimitic hyphal system featuring binding hyphae and hyphal pegs. Comprising over 100 worldwide, the genus is predominantly , with additional occurrences in temperate and subtropical zones, where it plays a key role in lignocellulose on decaying substrates. Notable for their ecological importance in nutrient cycling and potential applications in , several are also edible and exhibit medicinal properties, such as and activities. Recent taxonomic studies as of have described new , including L. punjabensis and L. saisamorniae. Taxonomically, Lentinus belongs to the phylum , class Agaricomycetes, order Polyporales, and family Polyporaceae, distinguished from related genera like Panus by its trama structure and presence of hyphal pegs in the hymenium. Morphologically, species typically feature a pileus ranging from 10 to 100 mm in diameter, often squamulose or hairy with colors varying from yellowish-brown to reddish-brown, paired with a central to eccentric stipe covered in scales and cylindrical basidiospores measuring 5.5–9.5 × 3–4 μm. The genus exhibits a but achieves highest diversity in tropical regions, with around 20 species documented in alone, including L. concinnus and L. tigrinus. Ecologically, Lentinus species are lignicolous, thriving on fallen logs, stumps, and branches during wet seasons, contributing to decomposition processes and . Several members, such as L. squarrosulus, are valued as mushrooms rich in proteins, vitamins, and minerals, and are cultivated or foraged in regions like , , and . Beyond nutrition, the genus holds biotechnological promise, with compounds from species like L. crinitus showing potential in nutraceuticals, agents, and environmental due to their bioactivity against pathogens and pollutants.

Taxonomy and classification

Etymology and history

The genus name Lentinus derives from the Latin adjective lentus, meaning tough, pliant, or tenacious, a reference to the chewy and resilient texture characteristic of the fruitbodies in this group of fungi. Lentinus was established as a genus by the Dutch mycologist Christiaan Hendrik Persoon in his 1801 publication Synopsis Methodica Fungorum, where he delineated it based on morphological traits such as the tough, leathery basidiocarps and lamellate hymenophore. This initial description built on earlier observations of tough-gilled fungi, separating them from softer agarics. In , Swedish mycologist Elias Magnus Fries provided a significant revision in Epicrisis Systematis Mycologici, refining species concepts within Lentinus and emphasizing its distinct position among hymenomycetes through detailed synonymy and distributional notes. Fries's work solidified the genus's framework, incorporating numerous species and establishing key diagnostic features like the decurrent gills and white prints. Throughout the 19th and early 20th centuries, Lentinus was classified within the due to its predominantly lamellate (gill-like) hymenophore, though some species exhibited labyrinthine or poroid structures that hinted at affinities with pore-bearing fungi. In the mid-20th century, taxonomic revisions based on these morphological traits—particularly the variable hymenophore transitioning from gills to pores and the reactions—led to its transfer to the , as proposed by Rolf Singer, who accommodated it alongside genera like in a broadened family concept. This shift reflected growing recognition of in hymenophore types across basidiomycetes. The 1970s saw intense debates on the generic boundaries of Lentinus, particularly concerning overlaps with related lentinoid genera such as Panus and Neolentinus, driven by field observations and microscopic analyses that questioned the stability of characters like hyphal pegs and clamp connections. These discussions, advanced by mycologists like David Pegler, resulted in species reassignments; for instance, certain tropical taxa were segregated into subgenera or new genera to better reflect evolutionary relationships, setting the stage for later molecular confirmations.

Phylogenetic relationships

The genus Lentinus is placed within the order and family , as supported by analyses of nuclear ribosomal (ITS) and large subunit (LSU) rDNA sequences, which nest it firmly within the core polyporoid of the Polyporales. These molecular markers have been instrumental in resolving the evolutionary relationships of Lentinus relative to other polyporoid genera, demonstrating its close affinity to poroid fungi while highlighting gilled forms as derived within this group. Early molecular studies revealed Lentinus sensu lato to be polyphyletic, with species distributed across multiple lineages in the Polyporales; for instance, Binder et al. (2005) used LSU rDNA and other markers to show that traditional Lentinus encompassed taxa now recognized in distinct genera, prompting taxonomic revisions. Consequently, several species have been transferred, such as certain North American and temperate taxa to Neolentinus (e.g., N. lepideus) and delicate, omphalinoid species to Lentinellus, based on phylogenetic evidence from combined ITS-LSU datasets that separate these from the core Lentinus. This polyphyly underscores convergent evolution of lamellate hymenophores in unrelated polyporoid lineages. Phylogenetic analyses delineate a core Lentinus clade characterized by tough, decurrent lamellae, distinct from outgroups like Polyporus, with Polyporus tricholoma often resolving as the sister species to Lentinus in multi-locus trees. Multi-gene phylogenies incorporating ITS, LSU rDNA, RNA polymerase II subunits (RPB1 and RPB2) from the 2010s further refine these relationships, confirming a monophyletic Lentinus/Polyporellus subclade within Polyporaceae and revealing biogeographic structure, such as divergent Asian and Australasian lineages exemplified by southeastern Asian species clustering separately from Australasian ones like L. exilis. These studies, building on Binder et al. (2005), emphasize the role of multi-locus data in stabilizing the phylogeny and resolving infrageneric divisions. Recent taxonomic research as of November 2025 has continued to expand the , with new such as Lentinus saisamorniae described from in 2023 based on morphological and molecular data, and a new variety L. squarrosulus var. odoratus identified in 2025 for its distinctive aroma. Additionally, an NSF-funded initiated in 2023 is investigating the phylogeny of Lentinus with a focus on global diversity, potentially leading to further revisions.

Morphology and characteristics

Macroscopic features

Lentinus species produce leathery to woody basidiocarps that are tough and persistent, often growing in a funnel-shaped or fan-like form suitable for field identification. These fruitbodies typically feature a solid, tough pileus that is round to convex when young, becoming depressed or infundibuliform with maturity, and measuring 2–20 cm in diameter depending on the . The pileal surface is generally dry to velutinous or scaly, with colors ranging from light brown to reddish-brown or darker with blackish scales, and margins that may appear saw-toothed or serrated. The stipe is central or eccentric, fibrous and tough, often 2–10 cm long and 0.5–2 cm thick, with a scaly or roughened surface that is paler than the , sometimes white to yellowish. The hymenophore consists of decurrent gills that are thick, distant, and white to yellow, occasionally labyrinthine or anastomosing in appearance, aiding in distinguishing the from pore-bearing polypores. Young fruitbodies may show hygrophanous caps that change color when moist, while mature specimens develop a drier, more rigid texture overall.

Microscopic features

The microscopic features of Lentinus are critical for taxonomic identification, revealing a combination of cellular structures that distinguish the within the Polyporaceae family. Basidiospores are typically , smooth, thin-walled, and non-amyloid, exhibiting an to cylindrical shape with dimensions ranging from 6-10 × 3-5 μm across . The hyphal system is trimitic, comprising generative hyphae (thin- to thick-walled, , branched, with clamp connections at ), thick-walled skeletal hyphae (aseptate, rigid, and non-branching), and binding hyphae (thick-walled, branched, and interwoven). This trimitic construction, often described variably as dimitic to trimitic in literature, contributes to the genus's characteristic toughness and coriaceous texture under . Basidia are club-shaped (clavate), thin-walled, , and tetrasterigmatic (bearing four sterigmata), measuring 20-30 μm in length. Cystidia are generally absent or sparsely distributed, though some species may feature cheilocystidia along lamella edges; pleurocystidia are rare. Key diagnostic traits include the presence of hyphal pegs in the for certain subgenera and the thick-walled skeletal hyphae, which provide structural reinforcement and aid in distinguishing Lentinus from related genera like Panus.

Habitat and ecology

Global distribution

The genus Lentinus exhibits a predominantly tropical and subtropical global distribution, with the majority of its approximately 63 accepted occurring in warm, humid environments across these regions. are typically saprotrophic, colonizing decaying wood in rainforests and woodlands, which aligns with the prevalence of such habitats in the . Paleotropical areas, including and , host several widespread taxa, such as L. squarrosulus, which extends from through to the Pacific islands. Asia represents a major center of diversity for Lentinus, with significant documented in countries like (20 species), (9 species), and (6 species), contributing to over half of the globally reported taxa in recent surveys. For instance, L. polychrous is commonly found in East and Southeast Asian forests, thriving on logs. This regional concentration underscores Asia's role as a hotspot, where environmental conditions favor the genus's wood-decaying lifestyle. Neotropical regions also show high diversity, particularly in , where species like L. crinitus are recorded across multiple countries including , , and , with endemics such as certain Amazonian variants restricted to ecosystems. Occurrences in temperate zones are rare and limited, primarily in southern Australia—where species like L. fasciatus appear on native eucalypt wood—and southern Africa, with sparse records in subtropical-transition areas of and neighboring regions. These distributions reflect the genus's adaptation to warmer climates, with temperate extensions likely facilitated by milder conditions. Recent biogeographic surveys from the 2020s, including molecular phylogenies, confirm these patterns while highlighting gaps in understudied areas like . Conservation assessments by the IUCN's Global Fungal Red List Initiative indicate threats to certain Lentinus species, primarily from habitat loss due to and in tropical ranges. For example, L. concavus is classified as Near Threatened, with population declines projected at around 15% in Amazonian habitats from ongoing land conversion, based on 2020s distribution modeling. Similarly, L. scleropus is widespread in the Neotropics and classified as Least Concern, emphasizing the need for protected forest reserves to sustain the genus's global ranges.

Ecological interactions

Lentinus species are primarily wood-decaying saprotrophs that colonize fallen logs and stumps of angiosperm trees, facilitating the breakdown of lignocellulosic materials in forest ecosystems. As white-rot fungi, they degrade , , and simultaneously, resulting in a fibrous, appearance of the substrate. This decay process is mediated by extracellular enzymes, including , which oxidizes in lignin to initiate . These fungi contribute significantly to nutrient cycling by releasing bound carbon and essential minerals from wood debris back into the soil, enhancing and supporting in terrestrial habitats. Studies on wood decomposition by Lentinus species indicate substantial mass loss rates, underscoring their efficiency in lignocellulose . This process aids in the gradual recycling of nutrients like and . Certain Lentinus species, such as L. squarrosulus, exhibit interactions with through their growth on mounds in African savannas, where they colonize the nutrient-rich, organic substrates created by activity. This association indirectly benefits from foraging and nest-building, which provide favorable microhabitats for fungal sporocarp development, though Lentinus does not form the seen in . Some Lentinus species, such as L. polychrous and L. squarrosulus, have been observed in association with dipterocarp trees in Southeast Asian forests, appearing in fertile areas dominated by these trees, though they are non-mycorrhizal.

Species and diversity

The genus Lentinus comprises approximately 63 worldwide, with the highest diversity in regions; for example, around 20 species are documented in .

Type species

The type species of the genus Lentinus is Lentinus crinitus (L.) Fr., designated as the lectotype to anchor the nomenclatural stability of the genus. Originally described as Agaricus crinitus by in 1753 based on European collections, it was transferred to Lentinus by in his 1821 , where the genus was established to encompass fungi with tough, leathery basidiomata and decurrent lamellae. Lentinus crinitus features small, clustered fruiting bodies growing on decaying , with pilei measuring 2.5–7.5 in , initially convex with a depressed center and becoming funnel-shaped; the surface is dry, covered in dense, radiating pale hairs that are yellowish-brown to dark reddish-brown, fading to pale yellowish-brown with age. The stipe is 2.0–4.0 long and 2.0–6.0 mm thick, leathery, slightly roughened, and often bearing a small basal , matching the pileus color but paler. Lamellae are decurrent, narrow, and forked, with white to pale cream spores measuring 5.5–8.0 × 1.8–3.0 µm, smooth and non-amyloid; the hyphal system is dimitic with clamp connections and includes generative and binding (skeleto-ligative) hyphae, contributing to the species' tough texture. This species' taxonomic placement has been confirmed in modern molecular phylogenies, which support its position within Lentinus sensu stricto in the Polyporaceae, distinguishing it from synonyms such as L. chaetoloma Fr. and related taxa previously confused due to morphological variability. During 19th-century classifications, L. crinitus played a pivotal role in Fries' delineation of generic boundaries, emphasizing the pliable, resilient consistency (from Latin lentus, meaning pliant) and gilled structure that separated Lentinus from polyporoid genera like Polyporus.

Notable species

Lentinus sajor-caju is a saprophytic species prevalent in , where it grows on decaying wood and is valued for its culinary applications in local cuisines. The develops vase-shaped to funnel-form fruiting bodies with caps that exhibit pale pinkish to whitish tones, often measuring several centimeters across, and a stem bearing a yellowish annulus. Lentinus crinitus, known as the fringed sawgill, has a widespread pantropical distribution, occurring on dead wood in forests across , , and Asia. It is distinguished by its hairy, shaggy caps, which are typically reddish-brown and up to 10 cm broad, contributing to its distinctive appearance among wood-decaying fungi. Extracts from its fruiting bodies demonstrate potential medicinal properties, including and activities that support its traditional use in some regions. Regarding conservation, is assessed as globally secure (G5) due to its broad distribution on decaying wood in temperate and boreal forests, though specialists within the face vulnerability from and loss of woody debris.

Human uses and significance

Culinary applications

Several in the Lentinus are and valued for their nutritional content, particularly in tropical regions of , , and . Lentinus squarrosulus, a common in these areas, is foraged and cultivated for its meaty fruitbodies, which are consumed fresh or dried in soups, stews, and stir-fries. It is rich in proteins (approximately 20-30% by dry weight), carbohydrates (45-55 g/100 g dry weight), and essential minerals like and , making it a nutrient-dense food source low in fat (around 2-3 g/100 g dry weight). Other include L. crinitus and L. connatus, which provide (up to 50% in some analyses) and , supporting their use in health-focused diets. Cultivation of L. squarrosulus has been successfully developed since the 2010s using substrates like , rice bran, and agricultural wastes such as , enabling year-round production in tropical climates. As of 2023, small-scale farming in countries like and has increased availability, though global production remains limited compared to more commercial mushrooms. These species are generally safe when cooked, improving digestibility, but overconsumption may cause mild gastrointestinal discomfort in sensitive individuals.

Medicinal and cultural roles

Species of Lentinus exhibit promising medicinal properties, primarily through bioactive compounds like and phenolics that demonstrate , , and activities. Lentinus crinitus, for instance, has shown antitumor effects against cells and antibacterial activity against pathogens like , attributed to its high phenolic content. Extracts from L. squarrosulus possess antifungal properties and support immune modulation, with studies indicating potential in and reducing . L. tigrinus is noted for its against cells in preclinical research. In , L. squarrosulus is used in African practices to treat ulcers, , and , often as decoctions or powders to boost vitality. In , species like L. crinitus are employed for their purported and antiviral effects, reflecting cultural significance in ethnopharmacology. While preclinical evidence is strong, clinical trials remain limited, with post-2020 reviews calling for further human studies to validate these benefits across diverse populations. No major toxicities have been reported, but proper identification is essential to avoid confusion with inedible look-alikes.

References

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