Polyporales » Polyporaceae » Megasporoporia

Megasporoporia setulosa

Megasporoporia setulosa (Henn.) Rajchenb. 1982, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Diagnosis: Basidiocarps annual, resupinate, adnate, leathery, without odor or taste when fresh, becoming corky upon drying, up to 7 cm long, 1.5 cm wide and 1 mm thick at center. Pore surface buff, ochraceous to pale yellowish brown when dry; pores angular, hexagonal, 0.5–1 per mm; dissepiments thin, entire; tube wall with hyphal pegs. Sterile margin indistinct. Subiculum cream to pale yellowish brown, corky, up to 0.2 mm thick. Tubes concolorous with the pore surface, corky, up to 0.8 mm long. Hyphal system trimitic; generative hyphae bearing clamp connections; skeletal and binding hyphae strongly dextrinoid, CB+; tissues unchanged in KOH. Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 1.5–3 µm in diam; skeletal hyphae dominant, hyaline to yellowish brown, thick-walled with a narrow lumen to subsolid, often branched, interwoven, 3–4.7 µm in diam; binding hyphae hyaline to yellowish brown, thick-walled with a narrow lumen to subsolid, flexuous, frequently branched, interwoven, 1–3 µm in diam. Generative hyphae infrequent, hyaline, thin-walled, usually unbranched, 1.5–3 µm in diam; skeletal hyphae dominant, hyaline to yellowish brown, thick-walled with a narrow lumen to subsolid, often branched, interwoven, 3–5 µm in diam; binding hyphae hyaline to yellowish brown, thick-walled with a narrow lumen to subsolid, flexuous, frequently branched, interwoven, 1–3 µm in diam. Cystidia and cystidioles absent. Dendrohyphidia absent. Hyphal pegs present. Basidia clavate, with four sterigmata and a basal clamp connection, 20–35 × 8–15 µm; basidioles in shape similar to basidia, but smaller. Polyhedric crystals frequently present. Basidiospores oblong-ellipsoid to cylindrical, hyaline, thin-walled, smooth, IKI–, CB–, (15.3–)15.6–19.3(–19.6) × (5.1–)5.3–7(–7.6) µm, L = 17.34 µm, W = 6.59 µm, Q = 2.85 (n = 30/1).

Index Fungorum Number:  IF110222

Notes: Megasporoporia setulosa is characterized by big and hexagonal pores, buff, ochraceous to pale yellowish-brown pore surface, a trimitic hyphal system, and oblong-ellipsoid to cylindrical basidiospores.

Figure 1.  Basidiocarps of Megasporoporia setulosa

Figure 2. Microscopic structures of Megasporoporia setulosa (drawn from Cui 8169). 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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