Foodplant / mycorrhiza / ectomycorrhiza
fruitbody of Russula claroflava is ectomycorrhizal with live root of Betula
Remarks: Other: uncertain
Other: sole host/prey

Plant / associate
fruitbody of Russula claroflava is associated with Sphagnum

In Great Britain and/or Ireland:
Fungus / saprobe
fruitbody of Tephrocybe mephitica is saprobic on dead, decayed, buried fruitbody of Russula claroflava
Other: unusual host/prey


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Russula claroflava

Russula claroflava
View the Mycomorphbox template that generates the following list
Mycological characteristics
gills on hymenium
cap is convex
hymenium is free
stipe is bare
spore print is white
ecology is mycorrhizal
edibility: choice

Russula claroflava, commonly known as the yellow swamp russula or yellow swamp brittlegill, is a basidiomycete mushroom of the genus Russula. It is found in wet places under birch and aspen woodlands across Europe and North America. It has a yellow cap, white gills and stipe and bruises grey. It is mild-tasting and regarded as good to eat.


It was described in 1888 by William Bywater Grove.[1] Its specific epithet is derived from the Latin clarus 'bright' or 'clear', and flava 'light yellow'.[2]


This medium-sized member of the genus Russula has a cap that is an egg-yolk yellow. Measuring 4–10 cm (1.5 4 in) in diameter, it is slightly sticky, and leaves and other debris often stick to it. There is usually a slight depression in the centre of mature specimens, with the margin becoming furrowed. The cap is half peeling. The 4–10 cm (1.5–4 in) high stem is white, fairly firm, straight and 1–2 cm thick. Its gills are pale ochre, and are adnexed to almost free. All parts turn dark grey on aging or bruising. The smell is fruity and the spore print is pale ochre, and the oval warty spores average 9.5 x 8 μm.[3] The edible but acrid Russula ochroleuca resembles this species, but has a duller yellow cap.[4]

Distribution and habitat[edit]

Russula claroflava appears in summer and autumn, usually with birch (Betula), or aspen (Populus), on heaths and moors, preferring damp places near ponds or lakes, often occurring in sphagnum. It is occasionally found in drier places. It occurs in Britain,[3] across northern Europe, and throughout North America.


This mushroom is edible and good, with a mild taste, both in Europe and North America.[3][4]

See also[edit]


  1. ^ Grove WB. (1888). "Wayside notes". Midland Naturalist 11: 265–266. 
  2. ^ Nilson S, Persson O (1977). Fungi of Northern Europe 2: Gill-Fungi. Penguin. p. 114. ISBN 0-14-063006-6. 
  3. ^ a b c Phillips R (2006). Mushrooms. London: Pan MacMillan. p. 40. ISBN 0-330-44237-6. 
  4. ^ a b Arora, David (1986). Mushrooms demystified: a comprehensive guide to the fleshy fungi (2nd ed. ed.). Berkeley: Ten Speed Press. p. 92. ISBN 0-89815-169-4. 

Cited literature[edit]

  • Marcel Bon, The Mushrooms and Toadstools of Britain and North Western Europe.
  • Courtecuisse and Duhem, Mushrooms and Toadstools of Britain and Europe.
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