Terrestriporia alba
Terrestriporia alba Y.C. Dai, B.K. Cui, F. Wu, Y. Yuan & Jia J. Chen, in Wu, et al., Mycosphere 11(1): 2761 (2020)
Etymology: Alba (Lat.): referring to the species having white pores.
Diagnosis: Differs from other poroid species of Russulales by its annual and resupinate habit, a monomitic hyphal structure with both simple septa and clamp connections, the presence of both gloeoplerous hyphae and gloeocystidiole
Basidioma annual, resupinate, inseparable from substrate, soft and without odour or taste when fresh, soft corky when dry. Pore surface white when fresh, becoming buff when dry; margin distinct, fimbriate, concolorous with pore surface, up to 3 mm wide, thinning out; pores round to angular, 2–3 per mm; dissepiment thick, entire to slightly lacerate, cottony. Subiculum concolorous with pores, cottony to soft corky, up to 0.4 mm thick. Tubes concolorous with hymenophore, soft corky, up to 0.7 mm long.
Hyphal system monomitic; generative hyphae mostly simple septate, occasionally bearing clamp connections; all hyphae IKI–, CB–, frequently encrusted by fine crystals; tissues unchanged in KOH.
Generative hyphae hyaline, thin-walled with a wide lumen, frequently branched and simple septate, rarely bearing clamp connections, mostly smooth, rarely bearing crystals, interwoven, 3.5–5 μm in diam.; gloeoplerous hyphae present, almost the same size as generative hyphae.
Generative hyphae hyaline, thin-walled with a wide lumen, frequently branched and simple septate, occasionally bearing clamp connections, frequently bearing fine crystals, interwoven, 2.5–4.5 μm in diam; gloeoplerous hyphae present, almost the same size as generative hyphae; gloeocystidioles present, fusoid, 17–40 × 4–7 μm; fusoid cystidioles present, hyaline, thin-walled,s, ellipsoid, hyaline, thin-walled, smooth basidiospores. almost the same size as gloeocystidioles; basidia clavate to barrel-shaped, bearing four sterigmata and a basal simple septum, 18–27 × 5–8 μm; basidioles in shape similar to basidia, but slightly smaller.
Basidiospores ellipsoid, hyaline, thin-walled, smooth, IKI+, CB–, (4.1–)4.2–6(–7.2) × (2.8–)3–3.6(–3.8) μm, L = 5.08 μm, W = 3.11 μm, Q = 1.5–1.69 (n =90/3).
Index Fungorum Number: IF834545
Figure 1. BI tree illustrating the phylogeny of Terrestriporia alba, and related species in Agaricomycetes based on the combined ITS+nLSU+RPB1+RPB2+TEF1 dataset. Branches are labelled with maximum parsimony and maximum likelihood bootstrap proportions higher than 75% and Bayesian posterior probabilities more than 0.95 respectively.
Figure 2. Chronogram and estimated divergence times of Terrestriporiaceae generated by molecular clock analysis using the RPB1 and RPB2 dataset. The chronogram was obtained using the Ascomycota–Basidiomycota divergence time of 582 Mya as the calibration point. The calibration point and objects of this study are marked in the chronogram. The geological time scale is in millions of years ago (Mya)
Figure 3. Basidioma of Terrestriporia alba. Scale bar = 4 cm (Dai 18548, holotype).
Figure 4. Basidioma of Terrestriporia alba. Scale bar = 4 cm (Dai 18547, paratype).
Figure 5. Microscopic structures of Terrestriporia alba (drawn from the holotype). a Basidiospores. b Basidia and basidioles. c Cystidioles. d Gloeocystidioles. e Hyphae from subiculum. f Hyphae from trama.
Reference:
Wu, F; Yuan, Y; Chen, JJ; Cui, BK; Zhou, M; Dai, YC. 2020. Terrestriporiaceae fam. nov., a new family of Russulales (Basidiomycota). Mycosphere. 11(1):2755-2766
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