Dentipellis tasmanica Y.C. Dai, G.M. Gates, X.H. Ji & P. Du

Ji, Xiao-Hong, Chen, Qian, Gates, Genevieve & Du, Ping, 2018, Dentipellistasmanica sp. nov. (Hericiaceae, Basidiomycota) from Australia, MycoKeys 41, pp. 29-38 : 33-35

Dentipellis tasmanica Y.C. Dai, G.M. Gates, X.H. Ji & P. Du sp. nov. Figs 1, 2

Diagnosis.

Differs from other Dentipellis species by its gloeoplerous hyphae and gloeocystidia that become dark blue in Melzer’s reagent and the presence of chlamydospores in subiculum.

Holotype.

AUSTRALIA. Tasmania: Arve River Streamside Reserve, 43°10'S, 146°48.5'E, elev. 160 m, on fallen trunk of Nothofagus sp., 15 May 2018, Dai 18767 (M, isotype in BJFC; ITS GenBank accession number: MH571699, 28S GenBank accession number: MH571702).

Etymology.

Tasmanica (Lat.): referring to the species collected from Tasmania of Australia.

Basidiomata.

Annual, resupinate, inseparable from substratum, soft corky, without odour or taste when fresh, fragile upon drying, up to 100 cm long, 40 cm wide and 3.5 mm thick at centre. Hymenophore with spines, cream when fresh and cinnamon when dry, spines up to 3 mm long, 2-3 per mm across base, soft corky to fragile, a few glued at tips when dry; margin distinct, white, fibrillous to cottony, up to 5 mm wide; spines, cream, becoming fragile and clay-buff when dry, up to 3 mm long. Subiculum very thin, soft corky, white to cream, <1 mm thick.

Hyphal structure.

Hyphal system monomitic; generative hyphae with clamp connections, IKI–, CB+; the colour and size unchanged in KOH.

Subiculum.

Generative hyphae colourless, thin- to slightly thick-walled, frequently branched, flexuous, interwoven, 3-4.5 μm in diam. Gloeoplerous hyphae occasionally present, dark blue in Melzer’s reagent. Chlamydospores present, ellipsoid, thick-walled, 5-5.6 × 2.8-3.3 μm.

Hymenophoral trama.

Generative hyphae colourless, thin-walled, frequently branched, straight, parallel along the spines, 2.8-4 μm in diam. Gloeocystidia abundant, colourless, thin- to slightly thick-walled, clavate, contents oily and dark blue in Melzer’s reagent, rooting deep from the trama, up to a few hundred microns long, the cystidia-like apical part 30-45 × 5-8 μm. Oily material abundant amongst trama.

Hymenium.

Cystidioles colorless, thin-walled, ventricose with elongated apical portion, bearing some irregular crystals, 30-45 × 5-8 μm; basidia clavate with four sterigmata and a basal clamp connection, 20-26 × 3-4.5 μm. Basidiospores ellipsoid, coloruless, thin-walled, densely echinulate, IKI+, CB+, (3.4 –)3.5–4.5(– 4.8) × 2.4 –3.2(– 3.5) μm, L = 3.99 μm, W = 2.92 μm, Q = 1.36-1.39 (n = 90/3).

Additional specimens examined (paratypes).

AUSTRALIA. Tasmania: Arve River Streamside Reserve, on fallen trunk of Nothofagus sp., 15 May 2018, Dai 18768 (M, duplicate in BJFC; ITS GenBank accession number: MH571700, 28S GenBank accession number: MH571703); Mt Field National Park, 42°41'S, 146°42'E, elev., 180 m, on fallen trunk of Nothofagus sp., 14 May 2018, Dai 18737 (M, duplicate in BJFC; ITS GenBank accession number: MH571698, 28S GenBank accession number: MH571701).