Datronia mollis
Datronia mollis (Sommerf.) Donk 1996, in Cui, et al., Fungal Diversity 97, 137–392 (2019)
Diagnosis: Basidiocarps annual, effused-reflexed, easily separate from the substrate, soft corky, without odor or taste when fresh, corky upon drying. Pilei conchoidal or semicircular, projecting up to 5 cm, 8 cm wide and 6 mm thick at base; resupinate parts up to 40 cm long, 5 cm wide, and 4 mm thick at center. Pileal surface dark brown to blackish, velutinate when juvenile, turning to glabrous with age, concentrically zonate, with radial longitudinal stripe, sometimes slightly warted in old specimens; margin acute. Pore surface gyey, grayish brown, pale brown, dark brown or dirty brown; pores irregular, 0.5–2 per mm; dissepiments thin, entire to lacerate. Sterile margin distinct, up to 1.5 mm wide. Context duplex, an irregular black line present, the upper tomentum layer pale brown, soft, up to 1.5 mm thick; the lower context layer pale buff to pale yellowish brown, corky to fibrous, up to 1.5 mm thick. Tubes pale grayish brown, corky, up to 3 mm long. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae IKI–, weakly CB+; tissues darkening in KOH. Generative hyphae hyaline, thin-walled, branched, 1.2–3.5 µm in diam; skeletal hyphae dominant, hyaline to pale brown, thick-walled, with a wide to narrow lumen to subsolid, frequently branched, interwoven, 2–4 µm in diam. Generative hyphae hyaline, thin-walled, branched, 1.2–3 µm in diam; skeletal hyphae dominant, hyaline to pale brown, thick-walled, with a wide to narrow lumen or subsolid, often branched, interwoven, 1.5–3.5 µm in diam. Cystidia absent; fusoid cystidioles present, thin-walled, smooth, 15–27 9 4–6 µm. Dendrohyphidia sometimes present. Basidia clavate, with four sterigmata and a basal clamp connection, 19–30 9 5–7.5 lm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores cylindrical, slightly curved, hyaline, thin-walled, smooth, IKI–, CB–, 6.5–9 9 2.5–3.5 µm, L = 7.76 µm, W = 3 µm, Q = 2.59 (n=30/1).
Index Fungorum Number: IF329707
Notes: Datronia mollis is characterized by effusedreflexed basidiocarps with blackish brown pilei, large, irregular pores, duplex context with a black line.
Figure 1. Basidiocarps of Datronia mollis
Figure 2. Microscopic structures of Datronia mollis (drawn from Dai 11456). a. Basidiospores; b. Basidia and basidioles; c. Hyphae from trama; d. Cystidioles. Bars: a–d = 10 µm
Reference:
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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