Polyporales » Polyporaceae » Truncospora

Truncospora ochroleuca

Truncospora ochroleuca (Berk.) Pilát 1953, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Diagnosis: Basidiocarps annual to perennial, pileate, corky to wood corky upon drying. Pilei usually semicircular, projecting up to 1.7 cm, 2.6 cm wide and 1.5 cm thick at base. Pileal surface buff to pale ochraceous when fresh, ochraceous upon drying, glabrous; margin obtuse. Pore surface cream buff when fresh, becoming buff upon drying; pores round, 4–5 per mm; dissepiments thick, entire. Sterile margin narrow, cream, up to 0.5 mm wide Context buff, corky, about 1 mm thick. Tubes concolorous with pore surface, woody hard, up to 14 mm thick. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae dextrinoid, CB+; tissues unchanged in KOH. Generative hyphae infrequent, hyaline, thin-walled, usually unbranched, 1.8–3.1 µm in diam; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, unbranched, interwoven, 3.2–5.2 µm in diam. Generative hyphae infrequent, hyaline, thin-walled, unbranched, 1.5–3.1 µm in diam; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, unbranched, interwoven, 3.1–4.7 µm in diam. Cystidia absent; fusoid cystidioles present, hyaline, thin-walled, 13.1–17 × 5.5–7.5 µm. Basidia barrel-shaped, with four sterigmata and a basal clamp connection, 20.5–28.1 × 10.6–12.1 µm; basidioles dominant, in shape similar to basidia, but slightly smaller.  Basidiospores ellipsoid, truncate, hyaline, thick-walled, smooth, strongly dextrinoid, CB+, (11.2–)13.1–15.1(–16.7) × (7.1–)7.3–8.7(–9.1) µm, L = 14.7 µm, W = 8.04 µm, Q = 1.78–1.88 (n = 90/3).

Index Fungorum Number:  IF291632

Notes: Truncospora ohiensis, T. detrita and T. ochroleuca share similar characters by having small basidiocarps, a dimitic hyphal system. However, T. ohiensis and T. detrita differ from T. ochroleuca by having brown to blackish-brown pileate basidiocarps (Gilbertson & Ryvarden 1987; Núñez & Ryvarden 2001)

 

Figure 1. Basidiocarps of Truncospora ochroleuca

 

Figure 2.  Microscopic structures of Truncospora ochroleuca (drawn from Cui 5673). a. Basidiospores; b. Basidia and basidioles; c. Cystidioles; d. Hyphae from trama. Bars: a–d = 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

Gilbertson RL, Ryvarden L (1987) North American polypores 2. Fungiflora, Oslo

Núñez, M, & Ryvarden, L. (2001) East Asian polypores 2. Synopsis Fungorum 14, 170–522

 

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