Panus bambusinus (T.K.A. Kumar & Manim.) N. Vinjusha & T.K.A. Kumar

Arun Kumar, T. K., 2021, Two new combinations in the genus Panus (Panaceae, Polyporales) based on morphology and molecular phylogeny, Phytotaxa 514 (3), pp. 287-294 : 289

Panus bambusinus (T.K.A. Kumar & Manim.) N. Vinjusha & T.K.A. Kumar comb. nov.

Basionym:— Lentinus bambusinus T.K.A. Kumar & Manim., Mycotaxon 92: 119 (2005) ( Fig. 1 )

Description: —Basidiomata annual, small to large, solitary or caespitose, centrally stipitate. Pileus 15‒200 mm diam, weakly depressed in the centre or infundibuliform, concentric zone absent, squamulose when young, almost glabrous with age, wrinkled in dried specimens, yellowish brown to light brown, margin entire, dentate or irregularly lobed. Hymenophore lamellate. Lamellae close, decurrent, sometimes dichotomously branched, edge finely fimbriate under a 10×lens, lamellulae present in 3‒4 tiers, yellowish white. Context up to 6 mm thick, white. Stipe 40‒100 mm long, 5‒25 mm thick, central, cylindrical, even in younger specimens, tapering towards the base in older specimens, surface glabrous to matted fibrillose or strigose, sometimes with sparse and scattered squamules, yellowish white to brown, tissue solid, cream. Odour not distinct. Spore print not observed.

Basidiospores 5–6.5 × 4–4.5 μm, Q=1.3–1.7, Q m =1.32, ellipsoid to ovoid, hyaline, smooth, thin-walled, with refractive guttules, inamyloid in Melzer’s reagent. Basidia 20‒37 × 5‒7 μm, clavate, 4 sterigmate. Cheilocystidia present, 22‒68 × 3‒5 μm, versiform, generally flexuose, branched towards apex, hyaline, smooth, thin-walled with obtuse tips. Gloeocystidia frequent on edges and sides of lamellae, 24‒48 × 6‒15 μm, mostly fusoid with acuminate tips, or narrowly clavate, hyaline, smooth, thin-walled. Hyphal pegs absent. Hymenial trama radially arranged, and dimitic. Generative hyphae 2‒6 μm wide, hyaline, smooth, thin to slightly thick-walled (up to 1 μm), branched, with clamp connections. Skeletal hyphae dominant, 2‒4 μm wide, hyaline, thick-walled (1 μm), mostly unbranched, rarely branched, septations not observed. Skeleto ligative hyphae not observed. Pileal trama radially arranged. Generative hyphae 2‒6 μm wide, rarely inflated up to 10 µm, hyaline, smooth, thin to slightly thick-walled (up to 1 μm), branched, with clamp connections. Skeletal hyphae dominant, 2‒6 μm wide, hyaline, thick-walled (1 μm), mostly unbranched, rarely branched, septations not observed. Skeleto ligative hyphae not observed. Pileipellis with scattered trichodermial patches, up to 100 μm long, made of hyphae that are 2‒4 μm wide, hyaline, thin to slightly thick-walled (up to 1 µm), with obtuse ends. Stipe trama interwoven. Generative hyphae 2‒5 μm wide, hyaline, smooth, thin to slightly thickwalled (up to 1 μm), branched, with clamp connections. Skeletal hyphae 2‒5 μm wide, hyaline, thick-walled (1 μm), mostly unbranched, rarely branched, septations not observed. Stipitipellis similar as pileipellis, made of hyphae that are 2‒4 μm wide, hyaline, mostly thin-walled, with obtuse ends.

Specimens examined:— INDIA. Kerala State: Malappuram district, Thenjipalam , Calicut University Campus , Alt. 2 m, 1.1339° N, 75.8940° E, on dead roots and rhizomes of Bambusa bambos , 2 July 2004, Arun Kumar AK61 a; 5 July 2004, Arun Kumar AK61 b (part of the holotype deposited at L); 18 October 2004, Arun Kumar AK61 c; 20 October 2004, Arun Kumar AK61 d; 26 October 2004, Arun Kumar AK61 e.

Figures

FIGURE 1. Panus bambusinus-A. Basidiomata (photo of dried herbarium specimen at ZGC, which is a part of the holotype at L) B. Generative hyphae showing clamp connection (arrow) C. Skeletal hyphae D. Hymenium with projecting gloeocystidia E, F, G. Gloeocystidia H. Cheilocystidia I. Pileipellis J. Basidiospores K. Basidiospore enlarged. Scale bars: A=20 mm, B, C=16 µm, D=26 µm, E, F, G=12 µm, H=18 µm, I=24 µm, J, K=6 µm. Photos by: Vinjusha N.