Observation 174639: Amanita amerifulva Tulloss nom. prov.
When: 2014-08-19
No herbarium specimen

Proposed Names

28% (1)
Recognized by sight: Under pine in mixed woods with sandy soil.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Hello, Eric.
By: R. E. Tulloss (ret)
2014-08-23 19:34:14 PDT (-0700)

The ratio of cap striation length to cap radius is helpful. So is the ratio of the stipe width at mid-stem to the width of the (often empty) central cylinder of the stem at the same point. So is the presence (and, if present, the thickness) or absence of a thin layer of cap skin (pileipellis) on the inner surface of the volval sac. There are probably some additional clues in the microanatomy. The job of finding characters with useful variation is not completed. Much is left undone.

It is a hard thing to try to deal with the taxonomy of Vaginatae.

Tools for genetic comparison are helping to identify hidden species that were not previously recognized (not named, not given a provisional name, not given a temporary code number,…simply not recognized).

At the just past NEMF 2014, I talked a little about the data that is being collected on A. rhacopus and other, very similar organisms that would fall under “Amanita ceciliae” as the name is used in several North American field guides. There appear to be a few more than anyone expected.

The genetic information tells us how many tabbed dividers we will probably need in the taxonomic library’s card catalog. After this we must return to morphology to see if it is possible to describe morphologically the entities for which we appear to have genetic evidence.

We are back in the “taxonomic fire”…looking for morphological characters that can be used to segregate taxa in the Vaginatae.

A robust challenge.

Very best,

Rod

Sounds promising…
By: Eric Smith (esmith)
2014-08-23 07:31:10 PDT (-0700)

I have no evidence to suggest it isn’t, but the longer I collect Amanitas, the less eager I am to apply field identifications sometimes. Looking closer at grisettes this year, I see that there is a bit of morphological variability among the fulvous and brown and gray-capped specimens. (Cap color, striation depth, and volva size and shape). What that means, if anything, I don’t know.

I some ways Amanitas from section Vaginatae “tell no tales”. They seem to have less macro identifying features; with no annulus, no bulb and often, no universal veil remnants on the cap.

Beautiful. Maybe close to amerifulva?
By: R. E. Tulloss (ret)
2014-08-20 09:14:18 PDT (-0700)

Rod

Beautiful. Maybe close to amerifulva?
By: R. E. Tulloss (ret)
2014-08-20 09:14:11 PDT (-0700)

Created: 2014-08-19 19:57:57 PDT (-0700)
Last modified: 2014-08-23 07:00:02 PDT (-0700)
Viewed: 39 times, last viewed: 2016-10-31 09:33:02 PDT (-0700)
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