Russula illota Romagn. - Freckled Brittlegill

Russula illota, Freckled Brittlegill

Phylum: Basidiomycota - Class: Agaricomycetes - Order: Russulales - Family: Russulaceae

Russula illota (syn. Russula laurocerasi var. illota) is an untidy fungus, usually damaged before it emerges from the forest floor, and very often with a hole in the cap through to the centre of the hollow stipe.

The macroscopic characters of this brittlegill differ very little from those of Russula grata and Russula foetens, and confident separation of these three very similar species is difficult and usually requires microscopic examination.

Distribution

This scruffy brittlegill is rare in Britain, as it is also in many other parts of Europe. The Freckled Brittlegill is recorded as occurring also in North America.

Taxonomic history

The Freckled Brittlegill was described in 1954 by French mycologist Henri Charles Louis Romagnesi (1912 - 1999), who gave it the scientific name Russula illota by which it is generally recognised today.

Etymology

Russula, the generic name, means red or reddish, and indeed many of the brittlegills do have reddish caps (but many more of the brittlegill mushrooms are not red, and several of those that are usually red can also occur in a range of other colours!).

The specific epithet illota means dirty or unwashed - a reference to the freckled appearance of caps of this brittlegill.

Identification guide

Cap of Russula illota, Freckled Brittlegill

Cap

5 to 10cm in diameter and more or less flat or slightly depressed in the centre when fully developed, the caps are spherical when young.

Honey brown and rather blotchy, the cap surface is viscid and develops intense radial ridges.

Gills of Russula illota

Gills

The narrow, adnexed gills are moderately close together; they are very brittle. Initially cream, the gills darken with age and their edges develop violaceous-brown 'dots and dashes'.

Stem

15 to 35mm in diameter and 4 to 8cm tall, the stems are white and solid, developing internal cavities; vinaceous-brown dashes devlelop longitudinally down the stems as they age.

 

Spores

Ellipsoidal, 8-9 x 6.5-7.5µm, ornamented with sharp warts up to 1.2µm tall with a few connecting lines but not forming a reticulum.

Spore print

Cream.

Odour/taste

Very variable (often in between Russula grata and Russula foetens) and so not generally of much help with identification.

Habitat & Ecological role

Coniferous and broad-leaf woodland, most often on chalky soil. In common with other members of the Russulaceae, Russula illota is an ectomycorrhizal mushroom.

Season

August to November in Britain and Ireland.

Similar species

Russula grata and Russula foetens are similar to Russula illota in appearance, habitat and season. Few people can tell these three fungi apart with any certainty without resorting to microscopic examination.

Culinary Notes

Russula caerulea is reported to be inedible.

Reference Sources

Pat O'Reilly (2016). Fascinated by Fungi, First Nature Publishing

Geoffrey Kibby (2011).The Genus Russula in Great Britain, published by G Kibby.

Roberto Galli (1996). Le Russule. Edinatura, Milan.

English Names for fungi; British Mycological Society, 2013.

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.

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