Observation 49742: Leucoagaricus americanus (Peck) Vellinga

When: 2010-08-05

Collection location: St. Louis, Missouri, USA [Click for map]

Who: Rob (gourmand)

No specimen available

This is a complicated group, and they are dangerous if you eat the wrong ones, so I wrote out the reasons I think this is L. americana:

Reddening lepiota, Lepiota americana (also called “American Parasol,” Leucocoprinus americana in Peterson).

1. stained dark red/orange immediately when cut.
2. growing in clump on wood
3. smooth, thick stem
4. too large to be Lepiota josserandi (deadly lepiota)
5. doesn’t look like Shaggy parasol (L. rachodes), and doesn’t stain saffron (although, Peterson says rachodes can stain “reddish orange”)
6. Leucoagaricus brunnea? can’t find any records of this mushroom anywhere, except in Peterson which mentions it as a deadly look alike. it stains brown instead of red. this could be Leucoagaricus/Lepiota rubrotincta??
7. C. molybdites just looks a lot different, has greenish gills, is larger, grows on grass not stumps or in clumps, etc. Although, it stains brown?
8. L. procera (Parasol) looks different, doesn’t grow in clumps.

the second most likely thing this could be is L. rachodes, which apparently is highly variable.

It is extremely unlikely to be either of two poisonous species, C. molybdites (impossible) or L. brunnea (can’t find much about this one?)

Volvolepiota or Macrolepiota pulchella are proposed as synonyms for L. brunnea?

[admin – Sat Aug 14 02:06:22 +0000 2010]: Changed location name from ‘St. Louis, MO’ to ‘Saint Louis, Missouri, USA

Species Lists


In this picture, you can see how even the gills begin to stain an orange/reddish color when cut

Proposed Names

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Created: 2010-08-05 23:19:53 CDT (-0400)
Last modified: 2013-12-01 16:01:40 CST (-0500)
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