(14 votes, average: 4.00 out of 5)
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Blue Roundhead
Inedible 
Autumn 
Winter 
Not a poisonous mushroom but can cause gastric upsets.
| Mushroom Type | |
| Common Names | Blue Roundhead (EN), Pengrwn Glas (CY), Pierścieniak Niebieskawy (PL), Zöldeskék Harmatgomba (HU) |
| Scientific Name | Stropharia caerulea |
| Season Start | Aug |
| Season End | Dec |
| Average Mushroom height (CM) | 9 |
| Average Cap width (CM) | 8 |
Cap
Convex opening to flattened cone. Green/blue when young turning pale tan/green.
Gills
White turning grey/brown. Not crowded.
Stem
White turning pale blue. Covered in scales.
Skirt
Has a long-lasting white ring, the top surface of which becomes coloured with the brown spores.
Flesh
White/pale blue.
Habitat
Mixed woodland, heath and grassland.
Possible Confusion
The only similar looking mushroom is the Verdigris Agaric (Stropharia aeruginosa), which is rarer and has white edged gills.
Spore Print
Purple/brown. Ellipsoid. The spores should be scrapped into a small pile to get an accurate spore colour.
Frequency
Fairly common.
Other Facts
This mushroom suspected to contains psilocybin and psilocin, powerful hallucinogens. There is a single study back from 1981 which reported these substances from the fruit body of S. caerulea, but it seems to be just a mistake, because none of the later analytical studies were able to find any of these even in traces.
This mushroom will also cause gastric upsets so is not a safe mushroom for consumption.
7 comments for Blue Roundhead
I have found these in my garden, should I report them?
For trespassing in their natural habitat?
Hahaha, you should pick them and make spore prints. Perhaps you could do something else with them if you so chose….
But thats a hilarious comment haha, call the authorities some mushrooms are growing hahahahahaha so funny 🤣
Please could you Send them my way please it would be much appreciate for mycology purposes of course x kind regards T
Hey can we make contact
Hi I found this mushroom on my allotment it is blue / green in colour and slimy is it a bad one
It could be a Blue Roundhead but we would need to see photos of the cap, stem and gills to be sure.