Date waxcap (Hygrocybe spadicea)

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Date coloured wax caps
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Date waxcap fact file

Date waxcap description

KingdomFungi
PhylumBasidiomycota
ClassBasidiomycetes
OrderAgaricales
FamilyHygrophoraceae
GenusHygrocybe (1)

Waxcaps are a group of fungi that have thick gills, watery flesh and a waxy texture (5). This waxcap has a brown, chestnut or coffee-coloured cap, which is slightly flattened but conical at first, becoming increasingly flattened in older specimens (2). The gills and the stem ('stipe') are bright yellow. The flesh is lemon yellow or yellowish white in colour, and the generic name Hygrocybe means 'moist head' (6).

WARNING: many species of fungus are poisonous or contain chemicals that can cause sickness. Never pick and eat any species of fungus that you cannot positively recognise or are unsure about. Some species are deadly poisonous and can cause death within a few hours if swallowed.

Size
Stem height: 4 - 7 cm (2)
Cap diameter: 3 - 7 cm (2)
Stem diameter: 0.5 - 1.2 cm (2)
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Date waxcap biology

Fungi are neither plants nor animals but belong to their own kingdom. They are unable to produce their own food through the process of photosynthesis, as plants do; instead, they acquire nutrients from living or dead plants, animals, or other fungi, as animals do. In many larger fungi (lichens excepted) the only visible parts are the fruit bodies, which arise from a largely unseen network of threads called 'hyphae'. These hyphae permeate the fungus' food source, which may be soil, leaf litter, rotten wood, dung, and so on, depending on the species. Fruit bodies of the date waxcap appear following heavy rainfall (3) between July and December (2).

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Date waxcap range

The date waxcap is found throughout much of Europe. In the UK it occurs in scattered localities including parts of Wales, Cumberland, Shropshire, Devon and the island of Colonsay in the Hebrides (3).

You can view distribution information for this species at the National Biodiversity Network Gateway.
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Date waxcap habitat

The often brightly coloured Hygrocybe waxcaps are generally associated with unimproved grassland (5). This species is found mainly on limestone pastures with a southern aspect, but has also been recorded from calcareous dunes and mown parkland (3).

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Date waxcap status

Provisionally classified as Vulnerable in Great Britain (3). Digging up fungi without permission could constitute theft under the Theft Act 1968 (4).

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Date waxcap threats

Although the historical and recent population trends of this species are not fully known, it seems likely that the following factors would have a detrimental effect on this species: changes in grassland management including fertiliser use and a reduction in grazing levels resulting in scrub invasion, trampling by humans, and vegetation succession on the dune sites (3).

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Date waxcap conservation

This fungus is a priority species under the UK Biodiversity Action Plan (UK BAP), and is included in English Nature's Species Recovery Programme. The Action Plan for this species aims to maintain all current populations through a number of measures. The lead partner for this species is Plantlife (3). Guidelines on minimising the impact of fungi collecting have been produced by English Nature (4).

The UK Biodiversity Action Plan for this species is available at UK BAP.
There may be further information about this species available via the National Biodiversity Network Gateway.
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Find out more

The Species Action Plan is available from:
http://www.ukbap.org.uk/

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Authentication

Information authenticated by Carl Borges of English Nature
http://www.english-nature.org.uk/ and by Dr Peter Roberts of Royal Botanic Gardens, Kew.
http://www.rbgkew.org.uk/

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Glossary

Calcareous
Containing free calcium carbonate, chalky.
fruit body
In fungi, the fruit body is the visible part of the fungus which bears spores (microscopic particles involved in both dispersal and reproduction).
Natural succession
The progressive sequence of changes in vegetation types and animal life within a community that, if allowed to continue, result in the formation of a 'climax community' (the last stage in a succession where the vegetation reaches equilibrium with the environment).
Photosynthesis
Metabolic process characteristic of plants in which carbon dioxide is broken down, using energy from sunlight absorbed by the green pigment chlorophyll. Organic compounds are made and oxygen is given off as a by-product.
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References

  1. National Biodiversity Network Species Dictionary ( December 2002) http://www.nhm.ac.uk/nbn/nhm/index.html
  2. Courtecuisse. R. (1999) Collins mushrooms of Britain and Europe. HarperCollins Publishers, London.
  3. UK Biodiversity Species Action Plan (November 2001): http://www.ukbap.org.uk
  4. English Nature (1998) The wild mushroom pickers code of conduct. English Nature, Peterborough.
  5. Boertmann, D. (1995) The genus Hygrocybe (Fungi of Northern Europe 1). Copenhagen: Danish Mycol. Soc.
  6. P. Marren (1998) Fungal flowers. The waxcaps and their world. British Wildlife9: 164-172.
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Image credit

Date coloured wax caps  
Date coloured wax caps

© Dave Shorten

Dave Shorten
daveshorten@cotswold-fungus.freeserve.co.uk

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