Radulotubus resupinatus Y.C. Dai, S.H. He & C.L. Zhao, in Zhao et al., Nova Hedwigia 103(1-2): 271 (2016)
Etymology: Resupinatus (Lat.): referring to resupinate basidiocarps
Basidiocarps annual, resupinate, waxy to hygrophanous, without odor or taste when fresh, becoming soft corky to slightly brittle when dry, up to 8 cm long, 4 cm wide, 3 mm thick at center. Pore surface white when fresh, cream to buff when dry, the fresh pores becoming pale brown to brown when bruised, the bruised part becoming greyish brown to brown when dry; pores round to angular, 2–4 per mm; dissepiments thin, entire to lacerate. Sterile margin narrow, white to cream, slightly fimbriate, up to 1 mm wide. Subiculum cream, membranous, up to 0.5 mm thick. Tubes concolorous with pore surface, brittle, up to 2.5 mm long. Hyphal system monomitic; generative hyphae hyaline, thin- to slightly thick-walled, bearing clamp connections, IKI-, CB-; tissues unchanged in KOH.
Basidiospores globose, hyaline, thin-to slightly thick-walled, smooth, usually bearing one guttule and a distinct apiculus, IKI-, CB-, (5–)5.5–6(–6.5) × (4.5–)5–5.5 (–6) μm, L = 5.74 μm, W = 5.3 μm, Q = 1.01–1.09 (n = 120/4). Subiculum Generative hyphae hyaline, thin- to thick-walled, frequently with clamp connections, occasionally branched, more or less regularly arranged, 3–3.5 μm in diameter. Tubes Generative hyphae hyaline, thin- to thick-walled, frequently with clamp connections, occasionally branched, 2–3 μm in diameter. Cystidia and cystidioles absent; basidia distinctly pleural, pyriform to barrel-shaped, with four sterigmata and a basal clamp connection, 18–21 × 8–10 μm; basidioles dominant, in shape similar to basidia, but slightly smaller. Rot type: A white rot.
Figure 1. Maximum Parsimony strict consensus tree illustrating the phylogeny of Radulotubus resupinatus and related species in Agaricales based on ITS sequences datasets. Branches are labeled
with maximum likelihood bootstrap (BS) higher than 70%, parsimony bootstrap proportions (BP) higher than 50% and Bayesian posterior probabilities (BPP) more than 0.95 respectively.