Entoloma mougeotii (Fr.) Hesler

Phylum: Basidiomycota - Class: Agaricomycetes - Order: Agaricales - Family: Entolomataceae

Entoloma mougeotii

Very few mushrooms are blue, and Entoloma mougeotii is one of the 'chosen few', most of which belong in the genera Entoloma or Cortinarius. (Other blue Entoloma species include Entoloma Bloxamii, which is a chunky Tricholoma-like mushroom; Entoloma chalybaeum; Entoloma nitidum; and Entoloma serrulatum.) All of the blue pinkgills are rare or uncommon to rare, and Entoloma mougeotii is such a rare find that it has not been given a formal common name in the British Mycological Society's list of recommended English names of Fungi.

Distribution

Entoloma mougeotii is a very rare find in Britain and Ireland; this attractive little mushroom occurs throughout much of mainland northern and central Europe, where it is also very rare. It is also recorded in parts of Asia.

Entoloma mougeotii, Wales

Taxonomic history

This lovely pinkgill owes its basionym to the great Swedish mycologist Elias Magnus Fries, who in describing this species scientifically in 1873 named it Eccilia mougeotii. The currently-accepted scientific name of this species dates from 1967, when American mycologist Lexemuel Ray Hesler (1888 - 1977) transferred it (with several other pinkgills) to the genus Entoloma, thus establishing its scientific name as Entoloma mougeotii.

Synonyms of Entoloma mougeotii var. mougeotii include Eccilia mougeotii Fr., Leptonia serrulata var. berkeleyi Maire,
Entoloma ardosiacum var. mougeotii (Fr) A. Pearson & Dennis, Leptonia mougeotii (Fr) P. D. Orton, and Entoloma mougeotii (Fr) Hesler.

Etymology

The generic name Entoloma comes from ancient Greek words entos, meaning inner, and lóma, meaning a fringe or a hem. It is a reference to the inrolled margins of many of the mushrooms in this genus.

The specific epithet mougeotii honours French naturalist Jean Baptists Mougeot (1776 - 1858); he was a botanist-mycologist and one of Christiaan Hendrik Persoon's most ardent correspondents and followers.

Identification guide

Entoloma mougeotiii, cap and gills

Cap

1.5 to 4cm across; initially convex with an involute non-striate margin, and slightly umbilicate, flattening, eventually with a straight margin; not hygrophanous; dark violaceous black, becoming violaceous brown with age; cap surface is tomentose or finely scaly.

Gills of Entoloma mougeotii

Gills

Adnate, sometimes with a decurrent tooth, white then pink (including the sterile gill edges, a feature which clearly differentiates this species from the otherwise very similar Entoloma serrulatum).

Stem

2 to 6cm long and 1 to 4mm diameter, cylindrical or slightly compressed laterally; steely grey with a whitish tomentose base; initially with longitudinal silky fibrils, becoming smooth with age; no stem ring.

Spores, Entoloma mougeotii

Spores

Mostly five- to eight-angled (pentagonal to octagonal) in side view; 9-11.5 x 6-8μm.

Show larger image

Spore print

Brownish pink.

Odour/taste

Not distinctive.

Habitat & Ecological role

Saprobic in grassland.

Season

Fruiting from summer to late autumn in Britain and Ireland.

Similar species

Entoloma serrulatum is similar but has black-edged serrulate gills.

Culinary Notes

Entoloma mougeotii is far too rare to be collected for anything but essential research. Let's treat it as deadly poisonous!

Reference Sources

Fascinated by Fungi, Pat O'Reilly 2016.

Knudsen H., Vesterholt J. (eds) Funga Nordica: agaricoid, boletoid and cyphelloid genera - Nordsvamp, 2008

Dictionary of the Fungi; Paul M. Kirk, Paul F. Cannon, David W. Minter and J. A. Stalpers; CABI, 2008

Taxonomic history and synonym information on these pages is drawn from many sources but in particular from the British Mycological Society's GB Checklist of Fungi and (for basidiomycetes) on Kew's Checklist of the British & Irish Basidiomycota.

Acknowledgements

This page includes pictures kindly contributed by David Kelly.

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