Observation 48844: Amanita umbrinolutea (Secr. ex Gillet) Bataille
When: 2010-07-19
No herbarium specimen

Notes: Found and id’ed by others at the SMG meeting.

This one I found the most interesting of the night. It was just marked A. vaginata at first, and I thought, no, that’s not right. When I pointed out the dark margins of the gills, we went back to the books. Came up with this id from a few books, seems to agree ok with Rod’s Amanita studies web site. I’m not sure that he mentions the dark marginate gills though…

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Marginate gills…
By: R. E. Tulloss (ret)
2010-07-21 08:44:50 PDT (-0700)

In my revision of A. umbinolutea, I wrote about the gills:

“with thin rather straight gray-brown to yellowish gray-brown edge.”

I’m sorry that I can’t remember my translation of the Latin from Battarra’s description of the mushroom that became A. battarrae. I have to get that translated again and on-line on the new web site.

R.

Um, ah,…
By: Douglas Smith (douglas)
2010-07-21 08:40:46 PDT (-0700)

Eee… um, well, not sure? I would say the color on the younger one looks about right. Which I would say is brownish? Not sure I can step into greyish vs. reddish in the brownish territory…

Amanita battarrae?
By: R. E. Tulloss (ret)
2010-07-21 08:33:36 PDT (-0700)

I see the clearly zonate cap now. Would you say the specimen was more grayish than reddish brown?

The volval sac seems to have orangish staining on the exterior. This could fit with Andreas Gminder’s concept of A. battarrae.

I’m not sure what to say about the marginate gills. Some taxa show marginate gills in some specimens and not in others. Marginate gills are often present when the stipe has dark fibrils on its surface. This is because the marginal tissue of taxa in section Vaginatae is connected to the surface of the stipe during development of the fruiting body; hence, there is a good chance than pigments developing in the tissue in question will end up on both of the surfaces separated by that tissue. The fact that the remnants of this tissue on gill edges is deciduous after the mushroom has expanded (dries up, decays, falls off, etc.) contributes to variation in the coloring (or lack of same) on the gill edge.

More in a bit.

R.

Another image for you.
By: Douglas Smith (douglas)
2010-07-21 08:23:40 PDT (-0700)

Here is another photo for you.

Any comment on the marginate gills? Is that just not a significant feature here?

Did you …
By: R. E. Tulloss (ret)
2010-07-21 06:22:57 PDT (-0700)

Douglas,

Did you get an image of the upward flaring cap from the top? The zonate color on the less expanded specimen could be caused by disease or decay…possibly related to the odd form of the warts on the cap. Also, there is a distinct reddish quality to the brown on the cap of umbrinolutea (hence, “umbrino-”).

Very best,

Rod

Created: 2010-07-21 04:32:55 PDT (-0700)
Last modified: 2010-07-21 06:19:59 PDT (-0700)
Viewed: 84 times, last viewed: 2016-07-11 02:51:26 PDT (-0700)
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