Entoloma clypeatum (L.) P. Kumm. - Shield Pinkgill

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

Entoloma clypeatum – Shield Pinkgill


Often with a wavy margin and a small central umbo, the form of the grey-brown cap of this largish (for an Entoloma) mushroom is the source of its common name.

Unlike most grassland pinkgills, which generally appear in summer and autumn, the Shield Pinkgill is a mushroom of spring and early summer, and it is probably mycorrhizal with trees of the family Rosaceae, under which it is most often seen.

Entoloma clypeatum – Shield Pinkgill, Lampeter, Wales UK

Distribution

This pinkgill mushroom is rarely seen in Wales but more commonly recorded in England and in some parts of Scotland. The Shield Pinkgill occurs fairly frequently also in most central and northern parts of mainland Europe and is recorded also from North America.

Taxonomic history

This impressive mushroom was described scientifically in 1753 by Carl Linnaeus, who gave it the name Agaricus clypeatus. (In those early days of fungal taxonomy most of the gilled mushrooms were included initially in the genus Agaricus!) It was the German mycologist Paul Kummer who, in 1871, transferred this species to its current genus, at which point its binomial scientific name became Entoloma clypeatum. Since then more than one form of this mushroom has been recognised, and so the formal name of the nominate (primary) form became Entoloma clypeatum f. clypeatum. (L.) P. Kumm.

Entoloma clypeatum – Shield Pinkgill, Lampeter, southern EnglandSynonyms of Entoloma clypeatum f. clypeatum include Agaricus clypeatus L., Agaricus fertilis Pers., Entoloma clypeatum (L.) P. Kumm., Entoloma clypeatum var. clypeatum (L.) P. Kumm., Entoloma fertile (Pers.) Gillet, and Rhodophyllus clypeatus (L.) Quél.

Entoloma clypeatum f. pallidogriseum Noordel. is a very rare pale grey form of the Shield Pinkgill, formally recorded from one site in England and one in southern Ireland but a little more common in some parts of mainland Europe.

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 clypeatum is Latin and means shaped like a round shield.

Identification guide

Cap of Entoloma clypeatum

Cap

3 to 10 cm across; initially convex, expanding to become broadly convex with a low umbo and occasionally a broad depression; various shades of grey-brown with darker brown radial fibrils; sometimes tinged yellow; hygrophanous, becoming much paler when dry; flesh thin, whitish and firm.

Gills of Entoloma clypeatum, Shield Pinkgill

Gills

Adnate; pale grey at first becoming pink and later a dirty brownish-pink at maturity.

Stem

3 to 5cm long and 8 to 15mm diameter; whitish with longitudinal silky brown fibrils, paler towards base; cylindrical, sometimes laterally compressed; no stem ring.

Spores of Entoloma clypeatum, Shield Pinkgill

Spores

Angular, pentagonal to heptagonal, 9-11 x 7.5-10µm.

Show larger image

Spore print

Pink.

Odour/taste

Not distinctive.

Habitat & Ecological role

This saprobic pinkgill is fairly common under trees of the family Rosaceae in open woodlands and in parkland.

Season

Fruiting from spring to midsummer in Britain and Ireland.

Similar species

The Wood Pinkgill, Entoloma rhodopolium, can be similar in cap colour, although the surface is smooth and silky.

Culinary Notes

Entoloma clypeatum is reported to be of 'suspect edibility', which I interpret to mean possibly poisonous. The Shield Pinkgill is quite similar in appearance to Entoloma species that are known to be seriously poisonous - for example Entoloma sinuatum, the Livid Pinkgill, which has caused the painful deaths of several people who have eaten it.

Reference Sources

Fascinated by Fungi, Pat O'Reilly 2016.

Studies in the genus Entoloma (Basidiomycota, Agaricales) from the Kiklades (C. Aegean, Greece), Machiel Noordeloos & Elias Polemis; Mycotaxon, Volume 105, pp. 301–312 July–September 2008.

Funga Nordica: 2nd edition 2012. Edited by Knudsen, H. & Vesterholt, J. ISBN 9788798396130

BMS List of English Names for Fungi

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 Simon Harding.

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