Collection location: Point Reyes National Seashore, Marin Co., California, USA [Click for map]
DD532 – Leucoagaricus rubrofolia nom. prov.
Originally one of two photos for Observation 1038, but later found to be a different species.
From Dr. Else Vellinga: DD532 is a mixture of two species; most specimens are what Dr. Sundberg called L. rubrofolia; there is one specimen of L. roseifolia. The names are similar, but the species actually are quite different.
L. rubrofolia is quite close to Leucoagaricus croceovelutinus from Europe and L. haemorrhagica from Australia and forms a group of species separate from species like L. roseifolia, L. flammeotincta, L. badhamii, L. cupresseus etc. The differences are manifold, very striking is the fact that the reddening reaction in L. rubrofolia is that and that the red does not change into the dark dirty blackish colour which so spoils the finds of L. flammeotincta and the such. A drop of KOH or ammonia has a different effect: orange-red in L. rubrofolia, and greyishgreenish in the others. Microscopically, again a wide array of characters; the spores in L. rubrofolia and its allies have a small but persistent papilla at the apex, giving them a very characteristic look.
By the way, the name L. rubrofolia has never been published officially.
I am still not 100% sure whether there are enough morphological characters distinguishing it from L. croceovelutinus to warrant a separate species, and if so, i would never use the name L. rubrofolia, as i think the name should refer to the pileus, and not to the lamellae.
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It turns out that there was an American name available for this species:
Lepiota castanescens Murrill. Though, it does not belong in Lepiota s.str., but has to be transferred at some point to Leucocoprinus/Leucoagaricus or what ever genus this fits best in.
This species forms, together with the European La. croceovelutinus and the Australian L. haemorrhagica a separate group, of species that change to red when pestered with ammonia (species like L. flammeatincta and L. badhamii turn green in ammonia).
Just so you know provisional names are supported and are expected to be given in quote. For example, Cantharellus “californicus”. If you want to change it, I would go into the actual name and change it there rather than just changing the observation.
I’ve also wondered about putting in accession numbers, but haven’t really thought it through. Is that something you think would be useful?
DD532 is currently unnamed