Polyporales » Phanerochaetaceae » Oxychaete

Oxychaete cervinogilva

Oxychaete cervinogilva (Jungh.) Miettinen 2016, in Miettinen, et al., MycoKeys 17, 1-46 (2016)

Basionym: Polyporus cervinogilvus Jungh., Praemissa in floram cryptogamicam Javae insulae, 45 (1838).

Diagnosis: Basidiocarp half-resupinate to pileate, annual, upper surface felt-like, yellowish brown with a lighter margin, lower surface brownish yellow or light ochraceous, 1–2 mm thick, caps projecting up to 3 cm, can fuse to form wide fruiting bodies. Consistency light cardboard-like when dry, somewhat flexible but easy to break apart. Pores regular, thin-walled, mouths rather smooth, (1)2–3 per mm. Cap context and subiculum yellowish brown, homogenous, upper surface not differentiated, up to 1 mm thick. Cap with a sharp, 1 mm wide sterile margin. Hyphal system monomitic, clamps absent. Hyphae homogenous throughout, mostly thick-walled, always with a wide lumen, rather stiff and straight, CB− to CB(+), IKI−, KOH−, CRB lilac. Encrustation absent except on cystidia. Subicular hyphae interwoven, loosely arranged, (3.2)4–5.4(7.5) μm in diameter, walls up to 1.5 μm thick, mostly ≤1 μm. Contextual hyphae mostly horizontally arranged but not strictly parallel, (3.8)4–5.1(5.5) μm in diameter. Tramal tissue loose and easy to study, hyphae rather straight, parallel in lower trama, subparallel and interwoven towards subiculum, (3)3.5– 4.8(6.2) μm in diameter, walls mostly 0.8–1.2 μm thick. Subhymenial hyphae thin- to slightly thick-walled, richly branching mostly like a corymb, not much winding. Cystidia abundant, hymenial, thick-walled, often with an apical crystal cap, (15)20–40(55)×4.5–9, projecting 5–25 μm above hymenium. Hymenium dominated by basidioles and cystidia, cells with constrictions especially in older basidiocarps. Basidia cylindrical to narrowly clavate, collapsing upon spore release and difficult to spot, with 4 sterigmata. Cystidioles absent. Basidiospores cylindrical, curved, thin-walled, smooth, (5.9)6–8.4(8.9) ×2.8–3.7(3.8) μm, L=6.93 μm, W=3.17 μm, Q’=(1.8)1.9–2.5(2.6), Q=2.19, CB−, IKI−, plasma stains in CB.

Index Fungorum Number:  IF811535

            Notes: Junghuhn (1838) provides a good painting of the species (Tab. IX), available through Google books (https://books.google.fi/books?id=AFJUAAAAcAAJ).

 

 

Figure 1. Microscopic characters of Oxychaete cervinogilvus, Schigel 5216, a subicular hyphae b tube trama and hymenium c hymenial cells d hymenial cystidia e spores.

 

Reference:

Magnago, A. C., & Alves-Silva, G., & Henkel, T. W., & da Silveira, R. M. B. (2022). New genera, species, and combinations of Boletaceae from Brazil and Guyana. Mycologia 114, 607-625.

 

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