Geliporus exilisporus
Geliporus exilisporus (Y.C. Dai & Niemelä) Yuan Yuan, Jia J. Chen & S.H. He 2017, in Yuan et al., Mycoscience, 58(3), 197-203 (2017).
Diagnosis: Basidiocarps perennial with a new layer of subiculum develops each year, resupinate, adnate, inseparable, corky and without odor or taste when fresh, hard corky when dry, usually making an ellipsoid patch, up to 20 cm long, 5 cm wide, and 9 mm thick at center. Pore surface white to cream when fresh, buff-yellow to greyish brown when dry; margin up to 3 mm wide, yellowish brown to rust-brown, cottony to tomentose; pores round to angular, 4e5 per mm; dissepiment thin, more or less entire. Subiculum yellowish brown to dark brown and hard corky when dry, up to 1mmin each year. Tubes concolorous with pore surface, corky when dry, up to 2 mm long.
Hyphal structure: Hyphal system monomitic; generative hyphae with simple septa; hyphae IKI–, CB+; tissues darkening but otherwise unchanged in KOH.
Subiculum: Generative hyphae hyaline, pale yellow to yellow, thin- to distinctly thick-walled, occasionally branched, interwoven, 4–7 µm diam.
Tubes: Generative hyphae hyaline to pale yellow, thin- to slightly thick-walled, occasionally branched, loosely interwoven and subparallel along the tubes, 3–4 µm diam; cystidia absent; basidia subclavate to barrel-shaped, with four sterigmata and a simple basal septum, 12–17 × 4.5–7 µm; basidioles in shape similar to basidia, but smaller; some rhomboid crystals present among tube trama.
Spores: Basidiospores cylindric to oblong-ellipsoid, hyaline, thin-walled, smooth, sometimes bearing one or two small guttules, IKI–, CB+, (5.9–)6–7.5(–8) × (2.5–) 2.8–3.4(–3.6) µm, L = 6.67 µm, W = 2.96 µm, Q = 2.16–2.32 (n = 120/4).
Index Fungorum Number: IF815750
Figure 1. Maximum parsimony strict consensus tree illustrating the phylogeny of Geliporus exilisporus and related species based on the 5.8SþnLSU sequences. Branches are labeled with parsimony bootstrap proportions (before slanting line) higher than 50% and Bayesian posterior probabilities (after slanting line) higher than 0.95. Bayesian posterior probabilities lower than 1 but higher than 0.95 were in bold.
Figure 2. Basidiomata of Geliporus exilisporus. A: A juvenile basidioma (Dai 10926). B: A mature basidioma (Dai 15244). Bars: A 1 cm; B 3 cm.
Figure 3. Microscopic structures of Geliporus exilisporus (Dai 15244). A: Basidiospores. B: Basidia and basidioles. C: Hyphae from trama. D: Hyphae from subiculum. Bars: A 5 µm; B–D 10 µm.
Reference:
Yuan, Y., Chen, J. J., & He, S. H. (2017). Geliporus exilisporus gen. et comb. nov., a xanthochroic polypore in Phanerochaetaceae from China. Mycoscience, 58(3), 197-203.
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