When: 2008-01-01

Collection location: Fauntleroy Park, Seattle, King Co., Washington, USA [Click for map]

Who: Joshua Birkebak (Shua)

No specimen available

Proposed Names

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By: Erin Page Blanchard (CureCat)
2008-01-05 06:32:06 CST (-0500)

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 01:17:20 CST (-0500)

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?

By: Alan Rockefeller (Alan Rockefeller)
2008-01-04 15:09:28 CST (-0500)

I think she has a point there.

By: Erin Page Blanchard (CureCat)
2008-01-03 19:19:04 CST (-0500)

S. riparia has a stipe which is thinner, more yellow to cream colour, and more twisted.

S. ambigua is larger, and has a stipe which is thick, white, and straight.

By: Joshua Birkebak (Shua)
2008-01-03 18:34:26 CST (-0500)

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…

By: Erin Page Blanchard (CureCat)
2008-01-01 22:51:36 CST (-0500)

Actually, that is S. riparia.

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