Tubulicium bambusicola S.H. He & S.L. Liu

Liu, Shi-Liang, Ma, Hai-Xia, He, Shuang-Hui & Dai, Yu-Cheng, 2019, Four new corticioid species in Trechisporales (Basidiomycota) from East Asia and notes on phylogeny of the order, MycoKeys 48, pp. 97-113 : 106-108

Tubulicium bambusicola S.H. He & S.L. Liu sp. nov. Fig. 6

Typification.

THAILAND. Chiang Rai Province, Doi Mae Salong, on dead culms of bamboo, 22 Jul 2016, He 4058 (holotype, BJFC 023499).

Etymology.

“bambusicola” refers to growing on bamboo.

Basidiomata.

Annual, resupinate, effused, closely adnate, thin, at first as irregular small patches, later confluent up to 15 cm long, 5 cm wide. Hymenophore surface smooth, pilose under lens due to the projecting cystidia, pale orange (5A3) to greyish-orange [5B(3-6)], finely cracked with age; margin undifferentiated.

Microscopic structures.

Hyphal system monomitic; generative hyphae with clamp connections, hyaline, thin-walled, moderately branched, frequently septate, loosely interwoven, 2-3 µm in diam. Cystidia abundant, subulate, projecting beyond hymenium, multi-rooted, hyaline, distinctly thick-walled, slightly amyloid, covered with dendroid branching hyphae, 70-100 × 10-16 µm. Basidia subclavate, hyaline, thin-walled, with 4 sterigmata and a basal clamp connection, 18-25 × 8-10 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores narrowly fusiform to vermicular, bi-apiculate, hyaline, thin-walled, smooth, negative in Melzer’s reagent, acyanophilous, (17 –)20–29(– 30) × (2 –)2.2–3(– 3.2) µm, L = 23.9 µm, W = 2.6 µm, Q = 9-9.5 (n = 60/2).

Additional specimens examined.

CHINA. Guizhou Province, Libo County, Maolan Nature Reserve, on rotten culms of bamboo, 11 Jul 2017, He 4776 (BJFC 024293).

Remarks.

Tubulicium bambusicola is distinguished by its large vermicular basidiospores and growing on bamboo. Three taxa, T. raphidisporum (Boidin & Gilles) Oberw., Kisim.-Hor. & L.D. Gómez, T. vermiferum (Bourdot) Oberw. and T. vermiferum var. hexasterigmatum J. Kaur & Dhingra are similar to T. bambusicola by sharing long vermicular basidiospores but differ in the width of basidiospores (≥ 3.5 µm) and growing on woody plant. Tubulicium junci-acuti Boidin & Gaignon on Juncus acutus differs from T. bambusicola by having shorter and wider basidiospores (15-20 × 3-4.25 µm, Boidin and Gaignon 1992).