Lentinus squarrosulus

Lentinus squarrosulus Mont

Index Fungorum number: IF477648; Facesoffungi number: FoF 3143

Pileus 20–70 mm diam., convex to applanate with a depressed at center or infundiliform shaped, with concentrically fibrillose squamules crowded at center toward margin, yellowish brown (5E4–8) to brown (6E6–8), with white background, margin smooth or broken when mature, with white fibrillose. Lamellae decurrent, white, narrowed, up to 2 mm wide, with white smooth margin. Stipe central to lateral, 3–70× 20–40 mm, equal, smooth or with white fibrillose. Annulus absent. Context white at pileus and stipe, fleshy–tough to leathery. Oder and Taste not observed. Spore print white. Hyphal system at tramal structure dimitic with generative hyphae and skeletal–ligative hyphae; generative hyphae thin–walled, hyaline, with clamp connection, up to 7 µm wide, branched; Skeletal–ligative hyphae up to 12µm wide, hyaline, thick–wall, with a continuous lumen, with 2–3 lateral branches. Hyphae on pileus not observed. Basidiospores 5–8 × 1.5–3 µm, cylindrical, thin–walled, hyaline, non–dextrinoid. Basidia 18–23 × 4–7 µm, clavate, thin–walled, hyaline, 4–spored. Cheilocystidia not observed.

Habitat and distribution: mostly grow in large clusters, rarely solitary; widespread in every forest type and found in all parts of Thailand (Chandrasrikul et al. 2011).

Material examined: Thailand, Chiang Rai Province, Toeng District, 19 June 2018, P. Sysouphanthong, PS2018–17 (MFLU22–0033); Chiang Mai Province, Muang District, Forest around Chiang Mai University, 19 May 2018, L. Keokaenngeun PS2018–51 (MFLU22–0034); Chiang Rai Province, Muang District, Hua Doi Village, 04 September 2018, P. Sysouphanthong, PS2018–183 (MFLU22–0037); Chiang Rai Province, Pa Daed Disrict, Pha Ngae, 29 August 2018, P. Sysouphanthong, PS2018–164 (MFLU22–0035); Chiang Rai Province, Mae Fah Luang District, forest near Doi Tung , 31 August 2018, coll. P. Sysouphanthong, PS2018–177 (MFLU22–0036).

Notes: In this study, this species was very common and found in several different habitats such as grasslands, agricultural areas, degraded forests and evergreen forests (Chandrasrikul et al. 2011). This species is also cultivated and sold in markets (Thawthong et al. 2014, Pukahuta et al. 2008, Sakaew et al. 2013).

Fig. 1 Maximum likelihood tree of Lentinus based on ITS–LSU sequences. The taxa in blue are specimens from Thailand. Support values of ML and MP≥70% and BI ≥ 0.95 are indicated on the nodes. Specimen voucher numbers are indicated after species names. Ganoderma boninense Pat. was used as the outgroup.

Fig. 2 Fresh basidiomata of Lentinus squarrosulus. a MFLU22–0037. b MFLU22–0034. c–d MFLU22–0035. e MFLU22–0033. f MFLU22–0036