Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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When you 3 say 'Chlorophyllum' is that specific species (only one in my Phillips) or does it include the macrolepiota and other lepiota? I'd rather assumed it could be a macrolepiota, quite similar to Phillips pic of m. konradii (and right time and habitat) but apparently that isn't common.
Paul Seligman. Flickr: http://www.flickr.com/photos/paul_seligman_cardiff/collections/721576087...
This group started out as Lepiota moved to Macroleptiota and now to Chlorophyllum. C brunneum was Lepiota rhacodes var. hortensis and also Lepiota bohemica. Lepiota olivieri is now C olivieri and the common or garden C rachodes has been through Lepiota and Macrolepiota rhacodes.
Lepiota konradii moved to Macrolepiota but as yet has not moved as far as Chlorophyllum.
All I can say is it is one of that group. Someone else might feel confident enough to give it a species name
Lat/Lng: 52.47559, -2.79055
OS grid ref: SO464867