Observation 31029: Amanita gemmata group

Growing on a fairly open slope with shaly,mineral soil. Under Madrones (Arbutus menziesii).

The Universal veil can be rubbed off easily.
I am drying it

[admin – Sat Aug 14 01:58:19 +0000 2010]: Changed location name from ‘Bear Creek Trail, Briones Reservoir, Contra Costa County, California, USA’ to ‘Bear Creek Trail, Briones Reservoir, Contra Costa Co., California, USA


paler specimens
paler specimens
paler specimens
Spores at 1000x smooth, inamyloid, oblong to ellipsoid 11.5-13 (14)µm x 7-8 µm

Proposed Names

24% (5)
Recognized by sight: Pale yellow cap, No partial veil
Based on microscopic features: Spores smooth, inamyloid, oblong to ellipsoid 11.5-13 (14)µm x 7-8 µm
30% (4)
Recognized by sight: not aprica. not exannulata with its membranous volva. something that needs a new name, in the gemmata group.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Erlon (Herbert Baker)
2009-12-29 17:15:58 CET (+0100)

Using one variable morphological characteristic like veil remnants to define a species may not be the best approach. The spores seem to be well within the range for A. aprica. Perhaps A. aprica “group” would be more correct, as they are probably closer to that species than than they are to A. gemmata, which does not occur in north america.

for the record…
By: Debbie Viess (amanitarita)
2009-12-29 17:06:10 CET (+0100)

the UV or warts on the cap of an aprica cannot be easily removed; the veil actually grows into the cap tissue. it is simple to test this in the field…just try to scrape a bit of the warts off with your fingernail.

By: Richard Sullivan (enchplant)
2009-12-29 15:18:27 CET (+0100)

For what that is worth I have added a picture of the spores.

I thought A. aprica was a Mountain species
By: Richard Sullivan (enchplant)
2009-12-29 14:59:39 CET (+0100)

Hi Herbert, I didn’t go with A. aprica because I thought it was a Sierra Nevada species, but It seems to fit fine otherwise. There were some specimens nearby that were very pale almost white.

Created: 2009-12-29 03:29:05 CET (+0100)
Last modified: 2010-11-26 10:11:13 CET (+0100)
Viewed: 123 times, last viewed: 2018-07-16 17:55:53 CEST (+0200)
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