Observation 22277: Geastrum pectinatum Pers.
When: 2009-06-08
Herbarium specimen reported

Notes: Found growing in forest duff near decaying stump (tree species unclear). Specimen was dried (probably persisting from last year), but in excellent shape. The pectinate peristome and grooved apophysis are characteristic of this species. See article http://en.wikipedia.org/wiki/Geastrum_pectinatum for more information.

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By: Robert Sasata (Sasata)
2011-05-30 08:12:53 PDT (-0700)

The size of the hyphal swellings were in the range given by Sunhede’s 1989 monograph (“Geastraceae (Basidiomycotina): morphology, ecology, and systematics with special emphasis on the north European species”) without the extremes noted for G. striatum (although admittedly, I did not have a culture of G. striatum available for a side-by-side comparison). Regarding the collar, Sunhede disagrees, indicating it is present in both pectinatum and striatum. However, I have seen a couple of field guides published since then that contradict this, so someone’s in error (though I tend to put more faith in the guy who wrote the monograph). Additionally, I don’t know of any reports of striatum in my area.

How
By: Irene Andersson (irenea)
2011-05-30 00:02:55 PDT (-0700)

do the micro characters differ between striatum and pectinatum?

I just know that striatum has a collar below the endoperidium, pectinatum doesn’t have it.

.
By: Robert Sasata (Sasata)
2011-05-29 18:09:07 PDT (-0700)

Micromorphological characters from in vitro tissue culture (grown from spores) corroborate G. pectinatum ID.

Created: 2009-06-17 10:51:20 PDT (-0700)
Last modified: 2011-06-02 05:43:09 PDT (-0700)
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