Theleporus rimosus H.S. Yuan, 2015

Yuan, Hai-Sheng, 2015, Molecular and morphological evidences reveal two new species in Grammothele and Theleporus (Basidiomycota) from southern China, Phytotaxa 213 (1), pp. 46-56 : 52-53

Theleporus rimosus H.S. Yuan , sp. nov. ( Figs. 4 & 5 )

MycoBank no.: MB 812580

Differs from Theleporus membranaceus in having thicker, cracked basidiocarps, a di-trimitic hyphal system and ellipsoid to fusiform basidiospores.

Holotype:— China. Guangxi Auto. Reg., Jinxiu County, Lianhuashan Mt. , on angiosperm stump, 24.VIII.2011 Yuan 5822 (holotype in IFP).

Etymology:— rimosus : referring to the cracked basidiocarps when dry.

Fruiting body:—Basidiocarps annual, resupinate, effused, leathery, without special odor or taste when fresh, corky and cracked to small patches when dry, up to 40 cm long, 10 cm wide and 0.8 mm thick; sterile margin white, up to 1 mm wide. Pores surface white when fresh, white with vinaceous buff tint upon drying; pores angular to round, 7–8 per mm; dissepiments thin. Subiculum homogenous, white, corky, azonate, up to 0.5 mm thick. Tubes concolourous with pore surface, corky, up to 0.3 mm long; hymenium restricted to the base of the pores.

Hyphal structure:—Hyphal system di-trimitic; generative hyphae bearing clamp connections; skeletal and binding hyphae hyaline, IKI–, CB–; tissue unchanged in KOH.

Subiculum:—Dominated by skeletal hyphae; generative hyphae hyaline, bearing clamp connections, thin-walled, unbranched, 1.5–2 μm diam; skeletal hyphae hyaline, thick-walled to subsolid, occasionally branched, strongly interwoven, 1.5–3 μm diam; binding hyphae hyaline, thick-walled to subsolid, frequently branched, 1.5–2.5 μm diam.

Tubes:—Dominated by skeletal hyphae; generative hyphae hyaline, bearing clamp connections, thin-walled, rarely branched, 1.2–1.8 μm diam; skeletal hyphae hyaline, thick-walled to subsolid, unbranched, strongly interwoven, 1.5– 2.5 μm diam. Dendrohyphidia present in hymenium and tubes dissepiment; cystidia absent; basidia clavate, bearing four sterigmata and a clamp connection, 15–18 × 5–6 μm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores.—Ellipsoid to fusiform, hyaline, thin-walled, smooth, IKI–, CB–, (5.2–)5.8–7.8(–8) × (2.7–)3–3.7(– 3.8) μm, L = 6.93 μm, W = 3.18 μm, Q = 2.18–2.19 (n = 60/2).

Additional specimens examined:— China. Guangxi Auto. Reg., Jinxiu County, Dayaoshan Nat. Res., on fallen angiosperm branch, 23.VIII.2011 Yuan 5808 ; Hezhou County, Guposhan Forest Park, on fallen angiosperm trunk, 16.VI.2014 Yuan 6873 ( IFP) .

Figures

FIGURE 4.—Basidiocarps of Theleporus rimosus (holotype).

FIGURE 5.—Microscopic structures of Theleporus rimosus. —a: Basidiospores. —b: Basidia and basidioles. —c: Dendrohyphidia. —d: Hyphae from trama. —e: Hyphae from subiculum.