Polyporales » Polyporaceae » Abundisporus

Abundisporus fuscopurpureus

Abundisporus fuscopurpureus (Pers.) Ryvarden 1999, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Basidiocarps perennial, pileate, corky, without odor or taste when fresh, becoming hard corky upon drying. Pilei applanate to slightly dimidiate or semicircular, projecting up to 5 cm, 9 cm wide and 2 cm thick at base. Pileal surface umber brown to dark brown or black, smooth, with indistinct concentric zones; margin acute, white to pale brown. Pore surface pinkish to buff when fresh, grayish brown to orange brown upon drying; pores round, 7–9 per mm; dissepiments thin, entire. Sterile margin narrow, grayish brown, up to 1 mm wide. Context clay-buff, corky, up to 2 mm thick. Tubes concolorous with pore surface, corky, up to 1.8 cm long.

Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae dextrinoid, CB+; tissues becoming brownish in KOH.

Generative hyphae infrequent, hyaline, thin walled, usually unbranched, 2.5–3.5 µm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a wide lumen, branched, flexuous, interwoven, 3–4.5 µm in diam. Tubes. — Generative hyphae infrequent, hyaline, thin walled, usually unbranched, 2–2.5 µm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a wide lumen, occasionally branched, flexuous, interwoven, 2–3.5 µm in diam. Cystidia absent; cystidioles occasionally present, fusiform, 10–16 9 3–5 µm. Basidia barrel-shaped to pear-shaped, with four sterigmata and a basal clamp connection, 12–16 9 6–10 µlm; basidioles dominant, in shape similar to basidia, but slightly smaller.

Basidiospores ellipsoid, yellowish, slightly thick-walled, smooth, non-dextrinoid, CB+, (2–)2.5–3.3(– 3.5) 9 (1.5–)1.7–2 (–2.5) µm, L = 2.82 µm, W = 1.87 µm, Q = 1.47–1.55 (n = 120/4).

Index Fungorum Number: IF447058

Notes: Abundisporus fuscopurpureus is similar to A. mollissimus B.K. Cui & C.L. Zhao in producing perennial basidiocarps, similar pores (7–9 per mm) and dextrinoid skeletal hyphae. However, A. mollissimus is distinguished in having soft corky basidiocarp and larger basidiospores (4–4.5 9 3–3.5 µm).


Figure 1. The bayesian inference (BI) tree of selected taxa in different genera of Polyporaceae based on the combined sequences dataset of ITS+nLSU+TEF1+mt     SSU+TBB1+RPB1+RPB2+nSSU sequences. The maximum likelihood bootstrap values (C 50), maximum parsimony bootstrap values (C 50) and bayesian posterior probability values (C 0.95) are indicated above the branches.


Figure 2. A basidiocarp of Abundisporus fuscopurpureus.



Figure 3. Microscopic structures of Abundisporus fuscopurpureus (drawn from Cui 10969). a. Basidiospores; b. Basidia and basidioles; c. Cystidioles; d. Hyphae from trama. Bars: a = 5 µm; b–d = 10 µm.



Cui, Bao-Kai & Li, Hai-Jiao & Ji, Xing & Zhou, Jun-Liang & Song, Jie & Si, Jing & Yang, Zhu-Liang & Dai, Yu-Cheng. (2019). Species diversity, taxonomy and phylogeny of Polyporaceae (Basidiomycota) in China. Fungal Diversity 97, 137–392.



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