Cortinarius pseudobulliardioides Kyto ¨v., Niskanen, Liimat. & Ammirati.
Index Fungorum number: IF551704 Facesoffungi number: FoF02468
Etymology: The name refers to affinity and similar appearance to C. bulliardioides.
Holotype: J.F. Ammirati & K. Liimatainen 11-452 (H).
Pileus 25–45 mm diam., at first conical, later low conical to almost plane with an umbo surface mat, dark reddish-brown, somewhat paler towards the margin, hygrophanous. Lamellae adnexed-emarginate, subdistant, moderately broad, moderately thick, at first light medium brown, becoming medium brown, edges remaining pale for some time, then concolor. Stipe 40–90 mm long, apex 4–7 mm thick, equal, whitish silky-fibrillose. Universal veil pink, forming broad, incomplete girdles on the stipe. Basal mycelium white. Context in pileus dark red brown, in stipe medium to light yellow brown. Odor indistinct. Basidia 4-spored, 9–11 x 35–40 um, clavate. Basidiospores 8.4–10 x 5.5–6.6 um, Q = 1.38–1.54, ellipsoid, finely verrucose, moderately dextrinoid. Lamella trama hyphae moderately to strongly encrusted in MLZ. Pileipellis duplex (in MLZ): Epicutis hyphae 6–14 um wide, encrusted. Hypoderm distinct, elements up to 25 x 40 um. Trama hyphae 5–12 um wide, encrusted. ITS sequence (holotype) distinct from the other known members of the clade Fulvescentes/Laeti, and differs from them in the ITS region by more than 7 substitutions and indel positions.
Ecology and distribution: In coniferous forests (Abies, Picea, Pinus, Tsuga). Widely distributed and known from western North America and Europe.
Material examined: FINLAND, Koillismaa, Kuusamo, Oulanka National Park, forests close to Kiutako ¨nga ¨s, dry Pinus sylvestris heath forest with some Picea and Betula on sandy and calcareous soil, 18 September 2002, leg. I. Kyto ¨vuori, K. Liimatainen & T. Niskanen 02-689 (H). U.S.A, Washington, Kittitas County, Table Mountain, coniferous forest (Abies, Picea, Pinus, Larix), 9 October 2011, leg. J.F. Ammirati & K. Liimatainen 11-452 (holotype, H;isotype, K). Additional specimens: CANADA, British Columbia, Tsuga heterophylla, cloneSLUBC12.
Notes: Cortinarius pseudobulliardioides is a rather large species in clade Fulvescentes/Laeti, in appearance similar to sister species C. subfloccopus and somewhat more distantly related C. bulliardioides. Cortinarius subfloccopus, however, usually has vinaceous red universal veil and C. bulliardioides has broader spores, >6 um wide.