Polyporus tuberaster
Polyporus tuberaster (Jacq. ex Pers.) Fr. 1821, in Cui, et al., Fungal Diversity 97, 137–392 (2019)
Diagnosis: Basidiocarps annual, centrally to laterally stipitate, solitary when growing on wood and solitary to caespitose when growing on the ground from a black sclerotium, fleshy when fresh and fragile upon drying. Pilei circular to semicircular, infundibuliform, up to 8.5 cm in diam and 8 mm thick. Pileal surface covered with small yellowish-brown to reddish-brown scales, radially aligned; margin thin, straight when fresh and incurved when dry. Pore surface white to cream when fresh, light brown upon drying; pores angular, 0.5–2 per mm; dissepiments thin, entire to lacerate. Context white when fresh and buff upon drying, up to 5 mm thick. Tubes concolorous with pore surface, decurrent, fragile when dry, up to 3 mm long. Stipe white when fresh and buff to ochraceous when dry, up to 2 cm long and 8 mm in diam. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae IKI–, CB +; tissues unchanged in KOH. Generative hyphae frequent, hyaline, thin-walled, occasionally branched, 4–12 µm in diam; skeletal hyphae dominant, hyaline, thick-walled, moderately branched, flexuous, tightly interwoven, 2–12 µm in diam. Generative hyphae frequent, hyaline, thin-walled to slightly thick-walled, 2–6 µm in diam; skeletal hyphae dominant, thick-walled, moderately branched, tightly interwoven, 2–7 µm in diam, occasionally inflated up to 23 µm in diam. Cystidia and cystidioles absent. Basidia clavate, with four sterigmata and a basal clamp connection, 25–48 × 8–13 µm; basidioles in shape similar to basidia, but slightly smaller. Generative hyphae frequent, hyaline, thin-walled, occasionally branched, 3–8 µm in diam; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, moderately branched, interwoven,2–7.5 µm in diam. Basidiospores mostly cylindrical, few oblong, hyaline, thin-walled, smooth, usually with one or more guttules, IKI–, CB–, (9.4–)10–16.3(–17) × (4.1–)4.5–7.2 (–7.7) µm, L = 13.36 µm, W = 5.86 µm, Q = 1.84–2.76 (n = 300/10).
Index Fungorum Number: IF201272
Notes: Polyporus umbellatus also grows on the ground from a sclerotium, but it differs from P. tuberaster by its strongly branched stipe.
Figure 1. Basidiocarps of Polyporus tuberaster
Figure 2. Microscopic structures of Polyporus tuberaster (drawn from Dai 11271). a. Basidiospores; b. Basidia and basidioles; c. Hyphae from trama. Bars: a–c = 10 µm
Reference:
Cui, B.K., & Li, H.J., & Ji, X., & Zhou, J.L., & Song, J. & Si, J., & Yang, Z.L., & Dai, Y.C. (2019). Species diversity, taxonomy and phylogeny of Polyporaceae (Basidiomycota) in China. Fungal Diversity 97, 137–392
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