Heteroradulum yunnanensis C.L. Zhao, 2020

Guan, Qian-Xin, Liu, Chao-Mao, Zhao, Tang-Jie & Zhao, Chang-Lin, 2020, Heteroradulum yunnanensis sp. nov. (Auriculariales, Basidiomycota) evidenced by morphological characters and phylogenetic analyses in China, Phytotaxa 437 (2), pp. 51-59 : 57

Heteroradulum yunnanensis C.L. Zhao , sp. nov. ( Figs. 2 , 3 )

Mycobank no.: MB 834997

Holotype.— China. Yunnan Province: Yuxi, Xinping County, Jinshan Forestry Park , on a fallen angiosperm branch, 2 January 2019, CLZhao 9132 ( SWFC).

Etymology.— Yunnanensis (Lat.): referring to the locality (Yunnan) of the type specimens.

Description.—Basidiomata annual, resupinate, leathery, without odour or taste when fresh, becoming membranaceous upon drying, up to 15 cm long, 100–300 µm thick. Hymenial surface odontoid, 50–100 µm long, white to slightly grey when fresh, becoming white to smoke grey upon drying, older basidiomata with more or less pronounced yellow stains. Sterile margin smoke grey. Hyphal system monomitic; generative hyphae with clamp connections, IKI–, CB –; tissues unchanged in KOH; subiculum almost absent or indistinct; hymenium thickening, hyphae colorless, more or less interwoven, thin-walled, unbranched, 2–4 µm in diameter.

Hymenium.—Cystidia clavate to fusiform, 13–35 × 2–6 µm; basidia narrowly ovoid to obconical, longitudinally septate, two to three-celled, embedded, often with a well-developed enucleate stalk, 28–41 × 9–14 µm. Basidiospores hyaline, thin-walled, smooth, cylindrical sometimes curved, with oily inclusions, IKI–, CB –, (15–)17–24(–24.5) × (4.5–)5–8(–8.5) µm, L = 20.6 µm, W = 6.71 µm, Q = 2.63–3.42 (n = 90/3).

Ecology and distribution.—Lignicolous, causing a white rot. Found in China.

Additional specimens (paratypes) examined.— China. Yunan Province : Yuxi , Xinping County, Jishan Forestry Park, on a fallen angiosperm branch, 2 January 2019, CLZhao 9200 ( SWFC) , 21 August 2018, CLZhao 8106 ( SWFC) ; Puer , Jingdong County, Ailaoshan National Nature Reserve, on the fallen angiosperm branch, 4 October 2017, CLZhao 4023 ( SWFC) .

Figures

FIGURE 2. Basidiomata of Heteroradulum yunnanensis (holotype). Bars:A = 2 cm, B = 2 mm.

FIGURE 3. Microscopic structures of Heteroradulum yunnanensis (drawn from the holotype). a. Basidiospores. b. Basidia. c. Cystidia. d. A section of hymenium. Bars: a,b,c,d = 10 µm.