▁to ▁refer ▁to ▁another ▁species ▁in ▁his ▁ 1 8 0 1 ▁Syn opsis ▁method ica ▁fung orum , ▁which ▁is ▁a ▁san ction ed ▁work . ▁St roph aria ▁ca er ule a ▁was ▁officially ▁described ▁by ▁my colog ist ▁Hann s ▁Kreis el ▁in ▁ 1 9 7 9 ▁from ▁collections ▁made ▁near ▁Wol deg k , ▁Germany . ▁Mach iel ▁No ord elo os ▁transferred ▁the ▁species ▁to ▁Ps il ocy be ▁in ▁ 1 9 9 5 , ▁but ▁today ▁this ▁genus ▁is ▁mostly ▁reserved ▁for ▁species ▁that ▁contain ▁the ▁ps y cho active ▁comp ounds ▁ps il ocy bin ▁and ▁ps il oc in . ▁Although ▁ps il ocy bin ▁had ▁once ▁been ▁reported ▁from ▁S .   ca er ule a , ▁subsequent ▁anal ys es ▁have ▁not ▁revealed ▁any ▁traces ▁of ▁the ▁subst ance ▁in ▁the ▁fruit ▁bodies . ▁ ▁The ▁specific ▁ep ith et ▁ca er ule a ▁is ▁Latin ▁for ▁" blue ". ▁The ▁m ush room ▁is ▁commonly ▁known ▁as ▁the ▁blue ▁round head . ▁French ▁my colog ist ▁Rég is ▁Cour te c uis se ▁has ▁called ▁the ▁m ush room ▁" ver dig ris ▁ag ar ic ", ▁but ▁numerous ▁other ▁authors ▁use ▁this ▁name ▁to ▁refer ▁instead ▁to ▁St roph aria ▁aer ugin osa . ▁ ▁Description ▁ ▁F ruit b od ies ▁have ▁con ical ▁to ▁fl atten ed ▁caps ▁meas uring ▁ ▁in ▁diameter . ▁They ▁usually ▁have ▁a ▁low , ▁broad ▁um bo . ▁The ▁colour ▁of