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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This thing looks like it has successive growth rings like a sea shell does?
Impressive fungus. Whats the white underneath all about?
Yes, they grow over a long time (years?).
The white surface is where the pores are.
The spores are rusty brown and colour the adjacent vegetation.
One of the experts here may be able to tell you which species it is.
I noticed the spores all over the vegetation all around it. I found some other patches of much darker spores in other places, no sign of what they came out of though. Maybe a puffball?
The only way to be sure of which species is to cut it in half and study the inside or look at the spores under a microscope and measure them.
i thought i'd typed in G. adspersum
G adspersum is now G australe.
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