Kavinia chacoserrana Robledo & Urcelay

Mycobank: MB821874 Facesoffungi number: FoF03450

Type – Argentina, Córdoba, Dpto. San Alberto, Los Hornillos, on dead fallen branch of Lithraea molleoides, 31°54’0.8”S, 64°58”0.6”W, 1280 m a.s.l., 28 Apr 2012 Robledo 2516 (CORD holotype, ITS MF377531).

Etymology – Referring to the ecoregion where it was collected, Chaco Serrano.

Basidiomata seasonal, resupinate, loosely attached, arising from the substrate in several surrounding points and then confluent with development. Hymenophore hydnoid, with spines up to 10 mm long, about 3 mm diam at the base slimming gradually to end in a sharp apex, white when immature, pale yellowish at maturity. Margin sterile, whitish, myceliar, with rizhomorphic strands. Subiculum whitish, loose, extremely thin. Hyphal system monomitic. Generative hyphae with clamps, ampuliform clamps occasionally observed, hyaline and thin-walled to very slightly thickwalled, up to 5 μm diam; hyphae parallel ordered and compact in the trama of spines, loosely interwoven in the subiculum. Cystidia absent. Basidia clavate, 30–40 long, 5–6 (–12) μm in the apex with four sterigmata and 2–3 μm at the base where present a basal clamp. Hymenium not reaching the apex of the spine which is sterile. Basidiospores cylindrical to fusiform in side view, with a distinctly supra-apicular concavity and a tapering to rounded apex; in dorsi-ventral view cylindrical to subcylindrical and then ovoid to slightly ellipsoid, (9.0–)10.0–12.0(–13.0) × (2.5–)3.0–4.0(–4.0) μm, ( X = 10.7 × 3.3 μm), Q = 2.5–4.2, (Q = 3.3), slightly thick-walled, hyaline to pale yellowish, warted, IKI–, CB–; commonly grouped in tetrads.

Known distribution – So far known only from the type locality.

Strict consensus tree from Bayesian inference of the combined ITS dataset. T= type

Kavinia chacoserrana (Robledo 2516 CORD Holotype). 2–4 Macromorphological characters. 2 General view in situ. 3 Close-up of margin showing rhizomoprhs. 4 Detail of the spiny hymenophore. 5 Basidiospores. Black arrows () indicate tetrads of basidiospores. These pictures are copyright of Gerardo Robledo.