Sistotremastrum chilensis Telleria, M. Dueñas & M.P. Martín, sp. nov. (Fig. 2)

Mycobank MB804754

Type:— CHILE, Los Lagos (X Region), Palena province, Comuna Hualaihué, Comau fjord, Huinay Reserve, path to Cerro del Tambor, 100 m, 42º22’44.5”S 72º24’25.8”W, on unidentified wood, 26 April 2012, M. Dueñas, M.P. Martín & M.T. Telleria, 19610Tell. (holotype, MA-Fungi 86368!)

Diagnosis:—This new species is closely related to S. guttuliferum but differs by the shape of subicular and subhymenial hyphae and its unique ITS sequence.

Basidioma resupinate, adnate, very thin; hymenophore whitish, under the lens reticulate to porose; margin indeterminate. Hyphal system monomitic, hyphae with clamps, distinct; subicular hyphae up to 6 µm wide, irregular and sometimes arranged parallely next to the substrate; subhymenial hyphae thinner, 3−4 µm wide, straighter and with vertical direction; both with small oil drops in the cytoplasm, and loosely interwoven. Cystidia absent. Basidia subclavate to subtubular, thin-walled, with a basal clamp, (16−)21−27 × 6.5−8 µm, and six to eight short, 3 µm long sterigmata. Spores narrowly ellipsoid, thin walled, 5−6.5 × 2.5−3 µm, inamyloid, indextrinoid and acyanophilous.

Etymology:—Relating to Chile

Known distribution:—Valdivian temperate rainforest in Chilean Northern Patagonian region.

Additional specimens examined: — CHILE. Los Lagos (X Region), Palena province, Comuna Hualaihué, Comau fjord, Huinay Reserve, path to Cerro del Tambor, 100 m, 42º22’44.5”S 72º24’25.8”W, on unidentified wood, 26 April 2012, M. Dueñas, M.P. Martín & M.T. Telleria, 19594Tell. (MA-Fungi 86366!) . Los Lagos (X Region), Palena province, Comuna Hualaihué, Comau fjord, Huinay Reserve, 147 m, 42º22’9.0”S 72º24’42.7”W, on Lophosoria quadripinnata, 30 April 2012, M. Dueñas, M.P. Martín & M.T. Telleria, 19709Tell. (MA-Fungi 86367!) .