Observation 136779: Amanita “sp-F11” Tulloss
When: 2013-06-17
Collection location: Alva, Florida, USA [Click for map]

Notes: found in same area as my other OBs

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A paper that is soon to appear will describe genetic relationships of a …
By: R. E. Tulloss (ret)
2015-10-02 23:51:12 CDT (-0400)

number of taxa that are presently unnamed and are among the Caesareae of the southern U.S. and Mexico. This species with a red ring around the inner ends of the marginal striations is not one I know. It might be one of the species for which DNA will shortly become known. I would very much like to examine this material if that is possible.

Very best,

Rod Tulloss

Notice the yellow-pigmented upper tips on the internal limbs of the volva in…
By: R. E. Tulloss (ret)
2013-06-18 09:48:48 CDT (-0400)

close-up cross-section of the volva. That is a very cool character that many people will never see (because it is inside the volva).

The internal limb is positioned between the stem and the underside of the partial veil when the developing mushroom is in the button stage. This is one of the very special things about Amanita development…from a completely solid button in which all the diverse parts must differentiate.

Very best,

Rod

Very nice section…and very nice to have the ruler in the image.
By: R. E. Tulloss (ret)
2013-06-18 09:45:10 CDT (-0400)

Clue about measuring caps that are not fully opened: Especially in species with a striate cap margin, the ratio of the length of the striation to the radius of the cap can be a valuable character for identifying to species. But…how to get the radius of an unopened cap? Use a strip of paper or a string to measure the cap from edge to edge (through the center of the cap). Don’t stretch the string or strip and mark it with pencil of thumb nail where it crosses the two opposite edges of the cap. Now measure between your marks (or, for a string, between your thumbnails). You now have the cap diameter. Divide that number by two. You now have the radius.

On the WAO website, in the description of a pileus margin (technical tab), the ratio of striation length to cap radius is given in this form “0.5R” or “0.15 – 0.35R”. Look at species here for examples of caps that are short striate:

http://www.amanitaceae.org?stirps+Crocea

Very best,

Rod

Created: 2013-06-18 08:04:34 CDT (-0400)
Last modified: 2015-10-02 15:54:10 CDT (-0400)
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