Observation 5829: Leratiomyces percevalii (Berk. & Broome) Bridge & Spooner
When: 2008-01-01
No herbarium specimen

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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By: Erin Page Blanchard (CureCat)
2008-01-05 05:32:06 CST (-0600)

The size difference is all to a degree of course. Generally speaking, S. ambigua is larger than S. riparia, however, during wet season I have seen some abnormally humongous S. riparia, and when especially dry I have seen really small S. ambigua. But once you’ve seen enough populations of both species, you’ll recognize the variable distinctions.

>Are their any less qualitative characters? Like micro differences?

From MushroomExpert:

S. ambigua
Microscopic Features: Spores 11-14 × 6-7.5 µ; smooth; elliptical; with a germ pore. Chrysocystidia present.

S. riparia
Microscopic Features: Spores 11-15 × 6-8 µ; smooth; elliptical to subfusoid. Chrysocystidia absent. Cheilocystidia abundant; clavate to cylindric; flexuous.

???
By: Joshua Birkebak (Shua)
2008-01-05 00:17:20 CST (-0600)

I am not at all convinced… I must say I have never collected S. riparia up here… I am not even sure it grows up here bu I have looked at many pictures (especially those on here…) and mine look nothing really like those… These stropharias were big and ambigua like… But since I don’t have any experience with this species I don’t want to jump to any conclusions…. Are their any less qualitative characters? Like micro differences?

yea
By: Alan Rockefeller (Alan Rockefeller)
2008-01-04 14:09:28 CST (-0600)

I think she has a point there.

.
By: Erin Page Blanchard (CureCat)
2008-01-03 18:19:04 CST (-0600)

S. riparia has a stipe which is thinner, more yellow to cream colour, and more twisted.
http://mushroomexpert.com/stropharia_riparia.html

S. ambigua is larger, and has a stipe which is thick, white, and straight.
http://www.mykoweb.com/CAF/species/Stropharia_ambigua.html

riparia?
By: Joshua Birkebak (Shua)
2008-01-03 17:34:26 CST (-0600)

What would lead you to call this riparia? I will say that I havn’t thought of that species… The large ohnje in the picture is about 12cm broad… Another thing is that these specimens are atleast a week old and thus lost any veil remnants…

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By: Erin Page Blanchard (CureCat)
2008-01-01 21:51:36 CST (-0600)

Actually, that is S. riparia.

S. ambigua is larger, with a thicker and straighter stipe.

Created: 2008-01-01 18:46:35 CST (-0600)
Last modified: 2011-11-02 13:35:45 CST (-0600)
Viewed: 65 times, last viewed: 2016-10-26 15:47:35 CST (-0600)
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