Observation 61072: Leucoagaricus adelphicus Vellinga

When: 2010-12-07

Collection location: Huddart Park, Woodside, California, USA [Click for map]

Who: Len (placeport)

No specimen available

Not sure about this, but looks like a Lepiota. Fairly small, and flesh very soft and fragile. No specific odor.

Proposed Names

53% (3)
Eye3 Eyes3
Recognized by sight: one of the many CA species that change colour with KOH, or when scratched in the genus Leucoagaricus
-64% (2)
Recognized by sight: Based on the East-West distinction, I’d recommend L. rubrotinctoides. However, if you look closely at th surface of the pileus, there are series of scales towards the margin, which do not form rays, radiating from the center, as in images of both L. rubrotinctus and rubrotinctoides.The center of the cap also does not have a marked dark circle as do many images of L. rubrotinctus and rubrotinctoides Many other features do match including the spores. I udnerstand there are many unidientified species and variants in this genus, so I am still not convinced that this specimen is rightly named. Spore print white.
Used references: “According to the specialists in the Genus Lepiota there seem to be several hidden species in the rubrotinctoides complex. According to Index Fungorum this taxon still hasn’t been formally transferred to Leucoagaricus and remains as Lepiota rubrotinctoides. Until we have more clarity on the matter, I assume that we do not see the original Leucoagaricus rubrotinctus in the Western USA.” http://www.mushroomhobby.com/...
Based on microscopic features: Spores about 4-5 × 8-9 u, elliptical, smooth, resemble published images.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Updated vote
By: Len (placeport)
2010-12-21 10:36:48 PST (-0800)

Update: after a little more research and contemplation, I will downgrade my vote for the rubrotinctoides name. I withdrew the Lepiota sp. name. (I am withdrawing more names now to avoid them wrongly popping up in searches and possibly misleading others. The web interface uses the term “destroy” to withdraw a name. I’d suggest to the site management to replace the word “destroy” with “withdraw,” which sounds less drastic.) I still can’t be too sure about the adelphicus name, as adelphicus is a fairly new species and there are very few references for it. I have requested some more references and will update my vote again if needed. Unfortunately I hadn’t time to do KOH tests or much else before the specimens deteriorated. However, I did not notice any reddening reactions due to handling. Not to say I was looking for that, as I did not do any crushing or cutting other than to sever one cap from the stipe for a spore print.

It didn’t burise red
By: Len (placeport)
2010-12-20 10:58:33 PST (-0800)
OK Else…
By: Debbie Viess (amanitarita)
2010-12-20 10:52:37 PST (-0800)

for those of us who are NOT world experts in this group, how do you distinguish adelphicus from other local, reddening Leucoagaricus species?

Created: 2010-12-20 00:03:02 PST (-0800)
Last modified: 2010-12-21 10:38:21 PST (-0800)
Viewed: 110 times, last viewed: 2017-06-08 04:59:20 PDT (-0700)
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