Observation 25451: Leucoagaricus Locq. ex Singer
When: 2009-09-18
No herbarium specimen

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By: Paul Derbyshire (Twizzler)
2009-09-18 12:16:42 CDT (-0400)

What’s the story with this genus? It seems to be a fairly recent (post-Lincoff) split from Lepiota.

Are the initially-white-gilled, free-gilled mushrooms a monophyletic clade? We have the black-spored Coprinus and relatives whose gills go white→black and then melt; dark-spored Agaricus whose gills go white→pink→dark brown; pink-spored Pluteus and Volvariella (no partial veil, UV on latter) whose gills go white→pink; and a bunch of pale-spored whose gills mostly stay white: Amanita (UV in evidence), Lepiota, and now Leucoagaricus and Leucocoprinus.

I’m curious as to what the phylogenetic relationships among these are. It’s notable that most of the deadly mushrooms are there (amatoxins and the Amanita smithiana toxin), in Amanita and Lepiota especially; the rest seem to be in two other sizable groups, Helvellaceae (gyromitrin) and Cortinariaceae (orellanin, amatoxins, and the worst muscarine-poisoners, Inocybe). The big question mark there being the amatoxic Pholiotina species — how closely related are the Bolbitiaceae and the Cortinariaceae, phylogenetically speaking? (A related speculation: there’s a deadly Crepidotus lurking out there somewhere.) The other wildcard is the cumulative/high-dose dangerous toxin in otherwise edible mushrooms that causes rhabdomyolysis and is found in a handful of trichs and russulas.

Perhaps L. barssii
By: Douglas Smith (douglas)
2009-09-18 05:40:23 CDT (-0400)

Are these shaggy enough to be called L. barssii? Can someone remind of the main Leucoagaricus in the grassy areas of the bay area, and the main differences in them? I need to be reminded every Sept., I don’t collect these much myself. There is something about the shaggy-ness of the cap, and the ability to stain red or brown? There is also the presence of germ-pore thing, and I forget that also, although I went through that detail a couple years ago…

Created: 2009-09-18 03:42:49 CDT (-0400)
Last modified: 2009-09-18 03:42:49 CDT (-0400)
Viewed: 22 times, last viewed: 2016-10-23 04:21:51 CDT (-0400)
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