Polyporales » Polyporaceae » Polyporus

Polyporus tuberaster

Polyporus tuberaster (Jacq. ex Pers.) Fr. 1821, in Cui, et al., Fungal Diversity 97, 137392 (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, 0.52 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 diamHyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae IKI, CB +; tissues unchanged in KOH. Generative hyphae frequent, hyaline, thin-walled, occasionally branched, 412 µm in diam; skeletal hyphae dominant, hyaline, thick-walled, moderately branched, flexuous, tightly interwoven, 212 µm in diam.  Generative hyphae frequent, hyaline, thin-walled to slightly thick-walled, 26 µm in diam; skeletal hyphae dominant, thick-walled, moderately branched, tightly interwoven, 27 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, 2548 × 813 µm; basidioles in shape similar to basidia, but slightly smaller. Generative hyphae frequent, hyaline, thin-walled, occasionally branched, 38 µm in diam; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, moderately branched, interwoven,27.5 µm in diamBasidiospores mostly cylindrical, few oblong, hyaline, thin-walled, smooth, usually with one or more guttules, IKI, CB, (9.4–)1016.3(–17) × (4.1–)4.57.2 (–7.7) µm, L = 13.36 µm, W = 5.86 µm, Q = 1.842.76 (n = 300/10).

Index Fungorum NumberIF201272

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