Calocera tibetica F. Wu, L.F. Fan & Y.C. Dai, 2021

Fan, Long-Fei, Wu, Ying-Da, Wu, Fang & Dai, Yu-Cheng, 2021, Calocera tibetica sp. nov. (Dacrymycetaceae, Dacrymycetales) from southwestern China, Phytotaxa 500 (2), pp. 133-141 : 136-138

Calocera tibetica F. Wu, L.F. Fan & Y.C. Dai , sp. nov. Figs. 2 , 3

MycoBank number:—MB 838631

Type:— CHINA. Tibet, Linzhi, Between Bomi County and Motuo County , on rotten wood of Abies , 18 July 2019, Y. C . Dai 20171 ( BJFC031842 ) .

Etymology:— Tibetica (Lat.): refers to the species being found in Tibet, China.

Description:— Basidioma stipitate, when fresh fasciculate or scattered, tough, gelatinous, yellowish to bright orange, dichotomously branched, dendroid or staghorn-like, with blunt tips, up to 2.3 cm high, stipe 0.2–1.8 mm in diam, when dry corneous and reddish brown, surface smooth. Marginal hyphae hyaline, smooth, thin - walled, septate, simple or branched, without clamp connections, 2.2–6.3 µm in diam; internal hyphae hyaline, smooth or scabrous, thinto slightly thick-walled, interwoven, with nodose-septa, without clamp connections, 1.3–5.8 µm in diam; hyphidia hyaline, smooth, thin-walled, with a simple septum at base, occasionally terminally branched; probasidia hyaline, thin-walled, subclavate to clavate, without basal clamp connection, bifurcate, 45.0–53.0 × 4.8–6.0 µm; basidiospores hyaline, smooth, thin-walled, oblong-ellipsoid to navicular, straight or curved, apiculate, usually 3–4-septate when mature, occasionally 5-septate, 9.0–13.0(–14.0) × 5.0–6.0(–6.3) μm, L = 11.18 µm, W = 5.62 µm, Q = 1.90–1.99 (n = 60/2), germinating by germ tubes.

Notes:— Calocera tibetica is characterized by stipitate, tough, gelatinous, dichotomously branched, dendroid or staghorn-like basidioma, and oblong-ellipsoid to navicular mature basidiospores usually with 3–4 septa. The 3–4- septate mature basidiospores are a unique characteristic of Calocera tibetica . The new species is morphologically similar to C. viscosa and C. mangshanensis , but the latter two species have 1-septate mature basidiospores.

Additional specimens examined (paratypes):— CHINA. Tibet, Linzhi, Between Bomi County to Motuo County , on angiosperm stump, 18 July 2019, Y. C . Dai 20178 ( BJFC031849 ); Y. C . Dai 20179 ( BJFC031850 ) .

Figures

FIGURE 2. Basidioma of Calocera tibetica (Holotype). Scale bar = 1.0 cm. Photos by: Yu-Cheng Dai.

FIGURE 3. Microscopic structures of Calocera tibetica (Holotype). A. Basidiospores without septum. B. Basidiospores with septa and germinations. C. Marginal hyphae and mature basidia. D. Probasidia and hyphidia. E. Hyphae with nodose-septa. F. A section of hymenium. Scale bars = 10 µm. Photos by: Long-Fei Fan.