Grammothele separabillima 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 : 50-52

Grammothele separabillima H.S. Yuan , sp. nov. ( Figs. 2 & 3 )

MycoBank no.: MB 812579

Differs from Grammothele delicatula in having dendrohyphidia, smaller pores and basidiospores.

Holotype:— China. Guangxi Auto. Reg., Longzhou County, Nonggang Nat. Res., on fallen angiosperm branch, 22.VII.2012 Yuan 6235 (holotype in IFP).

Etymology:— separabillima : referring to the basidiocarps easily separate from substrates.

Fruiting body:—Basidiocarps annual, resupinate, effused, often elongated along thin branches, easily separate from the substrate, leathery, without special odor or taste when fresh, soft corky when dry, up to 15 cm long, 2.5 cm wide and 0.3 mm thick; sterile margin white, up to 1 mm wide when fresh. Pores surface yellowish brown to cinnamon when fresh, pale orange-brown upon drying; pores distinct, entire, angular, 4–6 per mm; dissepiments thin, finely pruinose. Subiculum duplex, azonate, soft corky, up to 0.2 mm thick, upper layer concolourous with pore surface, lower layer dark brown. Tubes concolourous with pore surface, soft corky, up to 0.1 mm long; hymenium restricted to the base of the pores.

Hyphal structure:—Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae pale brown, dextrinoid in IKI, CB–; tissue unchanged in KOH.

Subiculum:—Generative hyphae hyaline, bearing clamp connections, thin- to slightly thick-walled, occasionally branched, 1.8–2.8 μm diam; skeletal hyphae pale yellow, thick-walled to subsolid, occasionally branched, interwoven, 1.8–4 μm diam.

Tubes:—Dominated by skeletal hyphae; generative hyphae hyaline, bearing clamp connections, thin-walled, occasionally branched, 1.5–2.5 μm diam; skeletal hyphae hyaline to pale yellow, thick-walled to subsolid, occasionally branched, strongly interwoven, 1.5–3 μm diam. Dendrohyphidia present in hymenium and tubes dissepiment; cystidia absent; basidia clavate with a narrow base, bearing four sterigmata and a clamp connection, 23–31 × 8–12 μm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores:—Oblong ellipsoid, hyaline, thin-walled, smooth, IKI–, CB–, (9.4–)9.8–11.4(–11.6) × (6.2–)6.4– 7.3(–7.7) μm, L = 10.75 μm, W = 6.92 μm, Q = 1.54–1.56 (n = 70/2).

Additional specimens examined:— China. Yunnan Prov., Jinghong County, National Forest Park, on fallen angiosperm branch, 13.VIII.2005 Yuan 1551, 1540, 1582 ; Nabanhe Nat. Res., on fallen angiosperm branch, 15.VIII.2005 Yuan 1680 ( IFP) .

Figures

FIGURE 2.—Basidiocarps of Grammothele separabillima (holotype).

FIGURE3.—Microscopicstructures ofGrammotheleseparabillima.—a:Basidiospores.—b:Basidiaandbasidioles.—c:Dendrohyphidia. —d: Hyphae from trama. —e: Hyphae from subiculum.