Collection location: Sebastopol, Sonoma Co., California, USA [Click for map]
Apex of the stipe shows the cone projecting down from the cap into the hollow stipe.
Wow – I said to myself “poison pie” as I collected it, but when it was cut, changed that opinion to H. sinapizans because of the cone. I should have brought it home for a closer scrutiny! So, it looks like both species have the cone.
It’s very interesting that you post this today. I was just looking at a fresh collection of East Bay Hebeloma this morning. Macroscopically I thought “Hebeloma crustuliniforme” group. After cutting the the mushroom longitudinally, it had the same projecting cone as in your picture…so I thought “maybe H. sinapizans”. After scoping the mushroom, I find non-dextrinoid spores. Jan Vesterholt, in “The Genus Hebeloma” says that H. sinapizans has dextrinoid spores, H. crustuliniforme has non-dextrinoid spores. That seems to leave out H. sinapizans…and the cheilocystidia are not ventricose like description of H. sinapizans in the Vesterholt book. I’m puzzled…maybe this isn’t a good character for H. sinapizans…the specimen is sitting next to my scope for further work, which I did not have time to do today. Further study is needed!