Unidentified fungus in greenhouse flat top decurrent gills, ringed stem

imgareth · #1 (**permalink**) 18-09-2011, 10:26 AM

Hi,

This is probably a really common one, and although I've done an arbitary 'search of the web' I've not found any images that look similar. I may be giving too much significance to the fact that this currently has a very flat top to it. My very inexperienced description:
Cream coloured fungus with a flat top - not scaly with some large diameter pits; decurrent gills; ring on stem. I'm not sure how I find out what colour the spores are!

Located in a greenhouse (more of a 'giant cold frame' at the moment!)
The soil I think is generic compost from the garden centre.
This fungus is growing under some very tall tomato plants.
It is the only one growing.

I hope the photographs are more useful than my description.

Chris Yeates · #2 (**permalink**) 18-09-2011, 10:36 AM

hi (and welcome to WAB)

probably an Agaricus species; pop a piece of white card under the gills for 24 hours - that will give you a spore print - you could also try popping a small mirror underneath to show gill colour/attachment

cheers

Chris

imgareth · #3 (**permalink**) 19-09-2011, 11:20 AM

Thank you for your one (and the only) reply. I guess it's not as intereting as some others to get any other, more specific opinions.

The spores are dark brown in colour (slightly ruined by dad watering the tomatoes and getting water on the card!!)
I do not have a small mirror to look underneath, and my phone cam can't quite focus as it is ver low to the ground so that clue will have to remain a mystery.

I noticed in the third photo that I posted above (click to see it in much better detail, larger) that there is some yellow on the side - I can't see this with the naked eye so it may be a result of the flash; all of the photos I tried to take of the underside came out distinctly yellow as well. LED flashes aren't the best for accuracy in colour I suppose...