Agaricales » Cystostereaceae » Rigidotubus

Rigidotubus tephroleucus

Rigidotubus tephroleucus J. Song, Y.C. Dai & B.K. Cui, in Song et al., Phytotaxa 333(2): 263 (2018)


Etymology: Tephroleucus (Lat.): referring to the grayish white pore surface.

Diagnosis: Rigidotubus tephroleucus is characterized by resupinate, tough basidiomata, grayish white pore surface, white sterile margin, a monomitic hyphal system with clamped generative hyphae, ovoid to ellipsoid and thin-walled basidiospores, 3.54.5 × 2.33 μm.

Basidiomata annual, resupinate, adnate, tough, without odor or taste when fresh, up to 20 cm long, 5 cm wide and 3 mm thick at centre. Pore surface grayish white when dry; pores round to angular, 24 per mm; dissepiments thin, entire to slightly lacerate; margin sterile, irregular, white, up to 3 mm wide. Subiculum white to buff when dry, membranous, up to 0.5 mm thick. Tubes concolorous with pore surface, tough, up to 2.5 mm long. Hyphal system monomitic; generative hyphae with clamp connections, all hyphae IKI, CB; tissues unchanged in KOH. Subiculum Generative hyphae hyaline, thin-walled, frequently branched, interwoven, 12 μm in diam. Tubes Generative hyphae hyaline, thin-walled, frequently branched, 0.52 μm in diam. Cystidia and cystidioles absent. Basidia clavate, with four sterigmata and a basal clamp connection, 812 × 35 μm in diam; basidioles dominant, similar in shape to basidia but smaller. Basidiospores ovoid to ellipsoid, thin-walled, hyaline, smooth, IKI, CB, 3.54.5 × 2.33 μm, L = 3.96 μm, W = 2.6 μm, Q = 1.491.52 (n=60/2). Rot type A white rot.

Index fungorum number: IF823703



Figure 1. Maximum parsimony (MP) tree of Rigidotubus and related genera based on ITS+28S sequence data. Branches are labeled with bootstrap value (MP/ML) higher than 50%, and posterior probabilities (BI) more than 0.95 respectively. Bold names = New species.


Figure 2. Basidiomata of Rigidotubus tephroleucus. Scale bar = 1.5 cm.


Figure 3. Microscopic structures of Rigidotubus tephroleucus (draw from the holotype). a Basidiospores. b Basidia. c Basidioles. d Hyphae from trama. e Hyphae from subiculum. Scale bars: ae = 10 μm.


Song J., Xing J.-H., Ji X., Sun Y.-F., Cui B.-K., & Dai Y.C.. 2018. Rigidotubus tephroleucus gen. et sp. nov. (Cystostereaceae, Agaricales) evidenced by morphological characters and phylogenetic analyses. Phytotaxa, 333(2), 259. doi:10.11646/phytotaxa.333.2.10


About Basidiomycota

The webpage Basidiomycota provides an up-to-date classification and account of all genera of the phylum Basidiomycota.


Supported by 

Thailand Science Research and Innovation (TSRI)

project entitled:

"Macrofungi diversity research from the Lancang-Mekong Watershed and surrounding areas"

(Grant No. DBG6280009)


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