Images of British Lichenicolous Fungi
Arrhenia peltigerina (Peck) Redhead, Lutzoni, Moncalvo & Vilgalys
(= Omphalina cupulatoides P.D. Orton)
Basidiomycota, Agaricales: fruitbody a milky coffee to dull brown 'omphalioid' toadstool, drying pale grey-brown to pallid, cap translucently-striate when fresh, gills few, thick, widely-spaced, arcuate-decurrent, sometimes forking, pallid brown, stem concolorous with cap or paler, thinly and minutely pubescent. Widespread but scarce or overlooked, parasitising Peltigera (always P. hymenina?).
Refs: Orton (1977), Kew Bulletin 31: 712 (as O. cupulatoides); Elborne in Knudsen & Vesterholt (2008), 229; Purvis et al. (1992), 402 (as O. cupulatoides); Hawksworth (1983), 33 (as O. cupulatoides).
Very similar in size, colour and general appearance to Lichenomphalia velutina, other species of Arrhenia and to certain species of Omphalina sens.strict., recognisable by host and by microscopic characters.
Rather wind-dried material on moribund Peltigera hymenina, in short, basalt turf, Glennifer Braes, Renfrewshire, November 2008 — with apologies to Chris Jones, co-finder and project student, who steadily approached hypothermia in the failing light and bitterly cold, gusting wind, while I proceeded to take 88 photographs in the hope that just one or two might be sharp.
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Uploaded March 2009, last modified March 2013