Ceriporia humilis Spirin & Miettinen

Miettinen, Otto, Spirin, Viacheslav, Vlasak, Josef, Rivoire, Bernard, Stenroos, Soili & Hibbett, David S., 2016, Polypores and genus concepts in Phanerochaetaceae (Polyporales, Basidiomycota), MycoKeys 17, pp. 1-46 : 27-28

Ceriporia humilis Spirin & Miettinen sp. nov. Figures 10band 11a

Holotype.

Russia. Nizhny Novgorod: Lukoyanov Dist., Sanki, Quercus robur , 14 Jul 2012, Spirin 4706 (H).

Etymology.

Humilis (Lat.), simple, shy; refers to basidiocarps devoid of good characters.

Description.

Basidiocarp 0.1-0.2 mm thick. Pore surface white to cream-colored, pores 5-6 per mm. Sterile margin narrow (up to 0.5 mm wide). Subicular hyphae irregularly arranged to subparallel, 4-8.3 µm in diameter. Tramal hyphae 4.1-5.3 µm in diameter. Subhymenial hyphae 3-4.7 µm in diameter. Basidia 9.2 –13.3×4.2– 5.1 µm. Basidiospores narrowly ellipsoid to cylindrical, ventral side flat, rarely concave, (3.1)3.2 –4.2(5.0)×(1.8)1.9– 2.2(2.3) µm, L=3.78 µm, W=2.09 µm, Q=1.81.

Remarks.

Ceriporia humilis produces rather large basidiocarps with rhizomorphs at the marginal area or in the substrate. The type specimen was collected from a fallen oak log in Nizhny Novgorod Region, European part of Russia. Another, much older collection derives from Helsinki, Finland (HFR009978, a fallen log of Acer platanoides ). One sequence of Ceriporia viridans in the INSDC from Shanxi, China belongs to Ceriporia humilis (KC182775, Dai 7642) showing that the species is present in East Asia, too. Ceriporia humilis has the narrowest spores in the whole species complex.