Observation 119726: Amanita gemmata (Fr.) Bertill.
When: 2012-12-09
Who: zaca
No herbarium specimen

Notes: Several collections growing under Quercus trees (see also observation 1197254 and observation 119725).

Proposed Names

61% (2)
Eye3 Eyes3
Recognized by sight

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Thank you both,
By: zaca
2012-12-14 10:14:52 PST (-0800)

Nimmo and RET, for your comments.

Hm…!
By: Nimmo (barky)
2012-12-12 13:30:58 PST (-0800)

I’m definitely not familiar with european Amanitas. I can see what you mean (from Google) that European collections have a more subtle partial veil that seems to disappear easily.

Also I agree I don’t see as much striation on the cap margins of the others that were found. In the second photo particularly the cap margin seems more striate, but that also could be the effect of the rain.

The gemmata here in California seem to more resemble A. muscaria, whiter stipes and more obvious annulus.

This confirms that my own limited amanita knowledge is only local and specific. :))

edit I just noticed the last response was from you, Rod, rather than the collector!

In the pictures for 119724 there is a younger cap that hasn’t faded.
By: R. E. Tulloss (ret)
2012-12-12 13:13:49 PST (-0800)

It is quite yellow. The margin of the cap is faintly striate, and not the sort of striation which is the trademark for section Vaginatae. Amanita gemmata is often reported with its partial veil lost. It would be fairly typical for it to have flaring volval limbs on its bulb due to the submembranous or thin-membranous nature of the universal veil.

I am most familiar with material referred to gemmata from Norway and Turkey and much less familiar with actual specimens from the western Mediterranean countries or Portugal). There is some suspicion that the name is applied to more than one taxon or that there is significant regional color variation (e.g., tan in Norway, quite pallid in Turkey, sometimes yellow with an orange disc in France, etc.). These thoughts were passed on to me by Dr. Bas quite a few years ago.

The original description says very little, but does say the cap is golden yellow (jaune d’orée). The spores are usually treated as ranging from broadly ellipsoid to ellipsoid with an average length/width ratio in the low 1.30s.

Perhaps, soon, someone in Europe will plan a vast population study using molecular methods and sampling as many gemmata-like populations as can be located in Europe and environs. :)

R

We need Amanitarita or Rod!
By: Nimmo (barky)
2012-12-12 12:23:10 PST (-0800)

I’m not seeing an annulus – this looks more like it could be a species in sect. vaginatae
possibly A. vaginata, A. crocea or A. fulva

But there is no umbo (bump) in the center of the pileus.
In my limited experience it most seems to resemble A. velosa from California.

Also the universal veil tissue seems smooth rather than “gemmata” or studded.
Your observation 119725 did look more like gemmata, at least the universal veil remnants on the pileus.

At the base of the stipe, when you peel away the volval sac, is the stipe straight, or does the stipe tissue itself form a bulb?
Was the tissue of the stipe white or butter-colored?

Created: 2012-12-12 11:22:43 PST (-0800)
Last modified: 2012-12-12 12:57:35 PST (-0800)
Viewed: 57 times, last viewed: 2016-10-21 07:49:29 PDT (-0700)
Show Log