Hygrocybe pratensis var. pratensis (Pers.) Murrill - Meadow Waxcap

Distribution - Taxonomic History - Etymology - Identification - Culinary Notes - Reference Sources

Taxonomy

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Agaricales

One of the largest of the waxcap fungi, and commonly known as the Meadow Wax cap, Hygrocybe pratensis is a common find on cropped grassland and upland pastures. It appears from late August until December and is generally considered edible although not highly prized.

In some fairly recent field guides you may find this species listed under one of its many synonyms, which include Camarophyllus pratensis and Hygrophorus pratensis.

Distribution

Widespread and fairly common in Britain and Ireland, particularly in upland areas on acidic soil, the Meadow Waxcap is one of the few Hygrocybe species that can tolerate small amounts of fertiliser being applied to its grassland habitat. The Meadow Waxcap often forms small groups or lines of mushrooms but also occurs as widely scattered singletons.

A pure white variety of the Meadow Waxcap occurs. Hygrocybe pratensis var. pallida (Cooke) Arnolds is very rare. You may find this waxcap recorded as Hygrocybe pallida, Hygrocybe ortonii or one of several other synonyms. In the USA it is common cited as Hygrocybe berkeleyi. Apart from colour, in all macroscopic and microscopic characters the white form is the same as the coloured form of Hygrocybe pratensis. The dry and fibrous, flattening cap tops of Hygrocybe pratensis var. pallida are distinctive, and if the caps of Hygrocybe virginea, the Snowy Waxcap, always had translucent edges then differentiating between the two would not be difficult, but a dry old Snowy Waxcap could perhaps be mistaken for what some people call the White Meadow Waxcap. We found the specimen shown on the left in an orchard at Mount Stuart, on the Isle of Bute in western Scotland. (Intermediate white forms with pinkish-centred caps are quite common.)

Hygrocybe pratensis at the National Botanic Garden of Wales

Taxonomic history

Although earlier naturalists had described the Meadow Waxcap - for example in 1796 the Shropshire botanist William Withering (1741-1799) described this grassland waxcap and called it Agaricus claviformis - it was Christiaan Hendrik Persoon who, when describing this species in his milestone publication Synopsis Methodicae Fungorum of 1801, created its basionym by naming it Agaricus pratensis. (In those days most gilled mushrooms were included initially in the genus Agaricus; the vast majority of them have since been redistributed to many other genera.)

It was not until 1914 that the famous American mycologist William Alphonso Murrill (1869 - 1957), writing in the journal Mycologia, transferred this waxcap to the genus Hygrocybe, establishing its currently accepted scientific name of Hygrocybe pratensis.

Two varieties of the Meadow Waxcap occur in Britain. The nominate form Hygrocybe pratensis var. pratensis, pictured at the top of this page and described in detail below, has a peach-coloured cap and stem, while Hygrocybe pratensis var. pallida (also pictured above) is pure white.

Being a large, conspicuous, attractive and edible mushroom, Hygrocybe pratensis var. pratensis has caught the eye of many great mycologists down the ages. As a result it has acquired several synonyms including Agaricus pratensis(Pers. Gymnopus pratensis (Pers.) Gray, Hygrophorus pratensis (Pers.) Fr., Camarophyllus pratensis (Pers.) P. Kumm., Hygrocybe pratensis (Pers.) Murrill, and Cuphophyllus pratensis (Pers.) Fr.

Etymology

The genus Hygrocybe is so named because fungi in this group are always very moist. Hygrocybe means 'watery head'.

As a specific epithet pratensis is equally easy to fathom out provided you have had a basic grounding in Latin. For those who have not, you will nevertheless be unsurprised to know that it it translates to 'of meadows'. That's where these chunky waxcaps are most often found.

Identification guide

	Cap The cap is slightly umbonate, 2 to 7cm in diameter and variable in colour from pale yellowish to buff or sometimes pinkish-red. Apart from during rain, the caps feel dry and smooth. As the fungus ages so the cap fades and its flesh turns from white to a pinkish buff.
	Gills Thick, broad and distant, the cross-connected whitish gills of Hygrocybe pratensis are decurrent - often extending more than 1cm down the stem.. With age the gills become more cap coloured. Stem White at first and later cap coloured, the solid stem of the Meadow Waxcap is stout and becomes hollow with age.
	Spores Ellipsoidal or teardrop-shaped to subglobose, smooth; 5.5-7 x 3.5-5μm. The spores shown on the left were from Hygrocybe pratensis var. pallida; however, there seems to be no significant difference in size between spores of the white and the coloured varieties of this mushroom. Spore print White.
Odour/taste	Not distinctive.
Habitat	Closely mown grassland where artificial fertilisers have not been spread in large quantities (although this waxcap will tolerate small amounts of fertiliser), and in some sheep-cropped upland pastures, notably near roadsides. Waxcaps have long been considered to be saprobic on the dead roots of grasses and other grassland plants, but it is now considered likely that there is some kind of mutual relationship between waxcaps and mosses.
Season	August to December in Britain and Ireland.
Similar species	Hygrocybe calyptriformis has a pink pointed cap and the cap invariably splits as it expands.

Culinary Notes

Hygrocybe pratensis with expanded caps that are firm and colourful rather than flabby and faded On a Europe-wide scale most waxcap fungi are now quite rare, and so although in western Britain many of the acid-soil species are still plentiful most mycologists deplore the suggestion of these lovely fungi being gathered to eat. Nevertheless, the Meadow Waxcap is quite well known as an edible mushroom, and in areas where there are enough of these fruitbodies to make collecting them worthwhile there are a few fungiphages who rate them very highly indeed.

Being fleshy and containing plenty of moisture (the latter a characteristic of waxcaps), Meadow Waxcaps can be fried in their own juices. Simply drop them into a hot pan with a bit of salt and pepper; there is no need to add fat or oil. When young and fresh the texture is firm, and so these wild mushrooms are good served with either meat or fish dishes.

One other plus point for this grassland mushroom (in its var pratensis form shown immediately above, of course, not the very rare var. pallida) is that it is difficult to confuse it with any of the poisonous gilled fungi that you are likely to find well away from trees.

Reference Sources

Fascinated by Fungi, Pat O'Reilly 2011

Fungi of Northern Europe, Volume 1 - The Genus Hygrocybe, David Boertmann, 2010.

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.