Crassisporus macroporus
Crassisporus macroporus B.K. Cui & Xing in Ji, Wu, Liu, Si & Cui, MycoKeys. 57:61-84 (2019)
Etymology: Macroporus (Lat.): referring to the large pores.
Diagnosis: Fruitbody: Basidiocarps annual, effused-reflexed to pileate, corky to leathery, without odor or taste when fresh, soft leathery upon drying. Pilei flabelliform, semicircular or elongated, projecting up to 1.5 cm, 4 cm wide and 5 mm thick at base; resupinate part up to 7 cm long, 4 cm wide, and 5 mm thick at center. Pileal surface buff to yellowish brown when fresh, becoming yellowish brown upon drying, finely velutinate, concentrically sulcate. Pore surface cream, buff to cinnamon-buff when fresh, becoming buff, pale yellowish brown to yellowish brown when dry; sterile margin distinct, buff to pale yellowish brown, up to 2 mm wide; pores round to angular, 2–3 per mm; dissepiments thin, entire to lacerate. Context yellowish brown to pale yellowish brown, leathery, up to 1.5 mm thick. Tubes pale yellowish brown, corky, up to 2 mm long. Hyphal structure: Hyphal system trimitic; generative hyphae bearing clamp connections; skeletal and binding hyphae IKI-, CB+; tissues turning to black in KOH. Context: Generative hyphae infrequent, hyaline, thin-walled, unbranched, 1.5– 3.5 μm in diam.; skeletal hyphae dominant, pale yellowish brown, thick-walled with a narrow lumen to subsolid, unbranched, more or less straight, interwoven, occasionally simple-septate, 2–5.5 μm in diam.; binding hyphae hyaline to pale yellowish brown, thick-walled with a narrow lumen to subsolid, flexuous, frequently branched, interwoven, 1–3 μm in diam. Tubes: Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 1–2 μm in diam.; skeletal hyphae dominant, hyaline to pale yellowish brown, thick walled with a narrow lumen to subsolid, occasionally branched, more or less straight, strongly interwoven, 1.5–3 μm in diam.; binding hyphae hyaline to pale yellowish brown, thick-walled with a narrow lumen to subsolid, flexuous, frequently branched, interwoven, 0.8–2 μm in diam. Cystidia absent, cystidioles fusoid, hyaline, thin-walled, 13–20 × 4.5–6 μm. Basidia clavate, bearing four sterigmata and a basal clamp connection, 17–28 × 7–8 μm; basidioles dominant, in shape similar to basidia, but smaller. Spores: Basidiospores oblong ellipsoid, hyaline, smooth, slightly thick-walled, IKI-, CB-, 9.5–13.2(–14) × 4–6.2(–6.5) μm, L = 11.24 μm, W = 4.96 μm, Q = 2.26–2.31 (n = 60/2).
Index Fungorum Number: IF 828489
Figure 1. Phylogeny of Crassisporus and related genera in Polyporales based on combined ITS and nLSU sequences. Topology is from ML analysis with parsimony bootstrap support values (≥50 %), maximum likelihood bootstrap support values (≥50 %) and Bayesian posterior probability values (≥0.95).
Figure 2. Phylogeny of Crassisporus and related species obtained for more representative taxa in the Polyporaceae based on combined sequences dataset of ITS+nLSU+mtSSU+EF1-α+RPB2. Topology is from ML analysis with parsimony bootstrap support values (≥50 %), maximum likelihood bootstrap support values (≥50 %), and Bayesian posterior probability values (≥0.95).
Figure 3. Basidiocarps of Crassisporus macroporus. Scale bars: 2 cm.
Figure 4. Microscopic structures of Crassisporus macroporus (drawn from the holotype) A basidiospores B basidia and basidioles C cystidioles D hyphae from trama e hyphae from context.
Reference:
Ji, X; Wu, DM; Liu, S; Si, J; Cui, BK. 2019. Crassisporus gen. nov. (Polyporaceae, Basidiomycota) evidenced by morphological characters and phylogenetic analyses with descriptions of four new species. MycoKeys. 57:61-84
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