Observation 188484: Agaricus xanthodermus Genev.
When: 2014-11-13
No herbarium specimen

Notes: The specimen at right is a spectacular example showing the large, membranous veil.
A. californicus always has a much more modest veil.

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Differences
By: Christian (Christian Schwarz)
2014-11-15 20:00:33 CST (-0500)

are subtle at first, but the more you see each species, the easier it gets:
A. xanthodermus has a more prominent, often huge, “billowing” partial veil.
A. californicus has a thicker-edged, much more modest PV.
A. xanthodermus stains violently yellow (usually), whereas A. californicus is much more reluctant to bruise, and then not so saturated “highlighter” yellow.
A. xanthodermus tends to have a constricted and then bulbous and right-angle crooked stipe base, whereas A. californicus tends to have a simple cyindrical and straight base.
A. xanthodermus can get much larger.

Cryptic species
By: Jacob Kalichman (Pulk)
2014-11-15 16:30:23 CST (-0500)

Couldn’t the question of whether there are cryptic species be applied to every observation on this site?

Hey
By: Byrain
2014-11-15 10:36:28 CST (-0500)

Do you mind sharing the different criteria that help you differentiate A. xanthodermus and A. californicus? I’m especially interested in what you meant when you said spores could distinguish them in the past? Could there be cryptic species?

Created: 2014-11-14 15:20:43 CST (-0500)
Last modified: 2014-11-14 15:23:42 CST (-0500)
Viewed: 32 times, last viewed: 2016-10-28 20:40:40 CDT (-0400)
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