Spongispora G. Wu, S.M.L. Lee, E. Horak & Zhu L. Yang, in Wu et al. Mycologia 110(5): 922 (2018)
Etymology: Spongispora (Latin), in reference to the sponge-like ornamentation of the basidiospore walls.
Diagnosis: Distinguished from all other genera of Boletaceae by the combination of the following features: whitish to pale yellow hymenophore turning brownish to brown where bruised, coarsely reticulate to reticulate stipe, basidiospores covered with sponge-like ornamentation with irregular clefts, cracks, and warts under SEM, and interwoven trichodermial pileipellis.
Basidiomes stipitate-pileate with tubular hymenophore. Pileus convex or plano-convex, surface dry, subtomentose to squamulose, in age often cracked into isolated squamules; context whitish to cream, very slowly staining pale brown after exposure. Tubes adnexed, concolorous with pores when young, becoming yellowish brown to light brown with age, not narrow. Pores roundish to irregular-angular, creamcolored when young, becoming apricot yellow to grayish orange with age, staining brownish to brown where bruised. Stipe central, coarsely reticulate to reticulate; context whitish to cream in the upper part, pale yellow in lower half, slowly staining pale brown to light brown on exposure. Basidiospores nearly elliptical to ovoid, surface irregularly warty under light microscopy but with sponge-like perforated exospore under SEM. Pleurocystidia and cheilocystidia subfusiform-ventricose, sometimes with apical beak. Pileipellis an interwoven trichodermium. Clamp connections absent.
Index Fungorum number: IF823811
Type species: Spongispora temasekensis G. Wu, S.M.L. Lee, E. Horak & Zhu L. Yang 2018, in Wu et al. Mycologia 110(5): 922 (2018)
Wu G, Lee SML, Horak E, Yang ZL. 2018. Spongispora temasekensis, a new boletoid genus and species from Singapore. Mycologia. 110(5):919-929