Polyporales » Polyporaceae » Megasporia

Megasporia hexagonoides

Megasporia hexagonoides (Speg.) B.K. Cui, Y.C. Dai & Hai J. Li 2013, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Diagnosis: Basidiocarps annual, resupinate, difficult to separate from the substrate, without odor or taste, leathery when fresh, becoming hard corky upon drying, up to 10 cm long, 5 cm wide and 3 mm thick at center. Pore surface cream to pale grayish buff when fresh, becoming pale yellowish brown when dry; pores round to angular, 0.5–1 per mm; dissepiments thin, entire to lacerate; hyphal pegs absent. Sterile margin indistinct. Subiculum pale brown, corky, up to 1 mm thick. Tubes concolorous with the pore surface, corky, up to 2 mm long. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae dextrinoid, CB+; tissues unchanged in KOH. Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 2.5–3 µm in diam; skeletal hyphae dominant, hyaline to yellowish, thick-walled with a narrow lumen, frequently branched, interwoven, 2.5–5 µm in diam. Generative hyphae infrequent, hyaline, thin-walled, often branched, 1.5–3.5 µm in diam; skeletal hyphae dominant, hyaline to yellowish, thick-walled with a narrow lumen, frequently branched, interwoven, 2–4 µm in diam. Cystidia and cystidioles absent. Hyphal pegs and dendrohyphidia absent. Basidia clavate, with four sterigmata and a basal clamp connection, 28–40 9 8–12 µm; basidioles in shape similar to basidia, but smaller. Rhomboid crystals frequently present. Basidiospores cylindrical to allantoid, hyaline, thin-walled, smooth, IKI–, CB–, (15–)17–21(–18) × 5–6(–6.7) µm, L = 18.5 µm, W = 5.67 µm, Q = 3.26 (n = 30/1).

Index Fungorum Number:  IF801185

Notes: Megasporia hexagonoides is characterized by big pores, large and cylindrical to allantoid basidiospores (17–21× 5–6 µm), the absence of hyphal pegs and dendrohyphidia.

 

Figure 1.  Basidiocarps of Megasporia hexagonoides

 

Figure 2. Microscopic structures of Megasporia hexagonoides (drawn from Dai 7834). 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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