Cortinarius parvisporus Vizzini nom. nov.

MycoBank MB 852973

Cortinarius brunneocarpus var. microsporus J.Khan, in Khan, Sher, Hussain & Khalid 2020: 5.

Etymology

The specific name is from the Latin word parvus (small) and sporus (spore) and refers to its small spores.

Type material

Holotype PAKISTAN • Khyber Pakhtunkhwa, Swat District, Miandam Valley; 2250 m a.s.l.; 7 Aug. 2016; on moist soil under Abies pindrow Royle; J. Khan MM1609; GenBank no.: MT250929 (ITS); SWAT [SWATMM1609].

Remarks

According to the phylogenetic analysis (Fig. 1), C. brunneocarpus var. microsporus and C. brunneocarpus are considered distinct species. Recombination at species level cannot be done because “ C. microsporus ” is pre-occupied by C. microsporus (Velen.) G.Garnier (Bibliographie des Cortinaires. D - O: 207 (1991). Consequently, a nomen novum is established above.

Cortinarius parvisporus, so far known from Pakistan, Estonia (Fig. 1) and Norway (Khan et al. 2020) differs from C. brunneocarpus mainly by the much smaller spores (6.1–7.6 × 4.8–5.4 μm versus 8.5–11.5 × 6.0–8.5 μm) (Song et al. 2019; Khan et al. 2020).