Observation 361291: Entoloma chalybaeum

When: 2019-03-13

Collection location: Briones Reservoir, Contra Costa Co., California, USA [Click for map]

Who: Pgrunow

No specimen available

very dark blue with bumps on cap; small white tomentum at base; gills bright white initially, then becoming grayer before eventually pink from spores;
when smelled closely it has an odd, but inoffensive, plastic smell
under poison oak, but in open mixed hardwood forest
taste weak, slightly bitter


Proposed Names

29% (1)
Recognized by sight: aka Leptonia
one of the “cyanula” leptonias
57% (1)
Recognized by sight: sensu Largent/Pacific Coast (aka Leptonia chalybaea group). This seems to fit best under Largent’s concept of chalybaeum versus other described Leptonias but is known to be genetically distinct and will need a new name. There is a collection by Calhoun in similar habitat from Marin county in 1978.
Some important characters include: a very gray glabrous stipe, with intense dark blue blotching near the apex only, blue-gray gills that fade slightly and become faintly marginate, general cap shape/color/pattern, bluish-white flesh, and clavate gill cystidia.
Basal tomentum perhaps is problematic, but matches some specimens so labeled and was barely visible at ground surface.
Mushroom is in series Caesicaules.
Used references: Entolomataceae in the PNW key, mycoportal/ specimen database, alpental.com, iNaturalist
Based on microscopic features: size and shape of spores and cystidia

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= Observer’s choice
= Current consensus


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