Cortinarius wiebeae (SDA 040)

Cortinarius wiebeae Thiers & A.H. Sm., Mycologia 61: 529 (1969) [MB#329174]
= Phlegmacium wiebeae (Thiers & A.H. Sm.) Niskanen & Liimat., Fungal Diversity 112: 154 (2022)

Collection date: May 28, 2017
Collector: Shannon Adams
Location: Lake Almanor area, CA
Habitat: Mixed fir (white fir, ponderosa pine)

Description:
Pileus: 39-55mm across.  Bright white developing yellowish tan stains.
Flesh: Off-white with faint tan stain. Taste: Mild to slightly sweet.  Lamellae: Pallid when young, developing rusty tones in maturity. Veil: Thick, membranous, white veil persisting through maturity. Stipe: Creamy white, mostly dirt encrusted. 19-38mm at stipe apex. 17-21mm at widest point. KOH: Slightly yellow on flesh.

Comparison of C.wiebeae (left) and C.verruciosporus (right)

ITS

Analysis: I have not found the type of Cortinarius magnivelatus publicly available.  However, the relatively short sequence I have from this collection matches several magnivelatus collections as well as being close to a sequence for the type collection of Cortinarius wiebeae. It also matches the description of the species. A phylogeny by Dimitar Bojantchev determined that this is in fact Cortinarius wiebeae.

Work is needed to clarify the several velate species in our region. There is another non-sequestrate species called Cortinarius weberi, described from Florida that can sound close on pronounciation but is separate to the above species.