Observation 50388: Amanita pseudovolvata Tulloss nom. prov.
When: 2010-08-15
Herbarium specimen reported

Notes: Under eastern hemlock. Pinkish sac-like volva. Cap 4.5 centimeters wide. Stem 5.5 centimeters long by 6 millimeters wide. Gills barely attached to the stem. Smells sort of like Chlorine. I guess it’s an Amanita, but I’m not positive. If so, not sure of section either.

Images

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Copyright © 2010 Hamilton
98581
Copyright © 2010 Hamilton
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Copyright © 2010 Hamilton

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Comments

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Thank you Mr. Zimmer.
By: Hamilton (ham)
2010-08-16 18:02:35 PDT (-0700)
Nice find and photos,
By: Eric Smith (esmith)
2010-08-16 18:00:22 PDT (-0700)

Hamilton.

Handling the floccose stems on some amidellas…
By: R. E. Tulloss (ret)
2010-08-16 15:36:04 PDT (-0700)

you get a pale brick reaction that becomes more of a red-brown or brown-red with time. In wet weather, sometimes making a slit or two in the cap with a thumbnail will show a quick flash of pink; however, this made away and then be followed by the darker, brick-like colors. Brick staining is characteristic of several of the North American amidellas. The weakest staining/bruising reactions (very weak and often not pinkish) that I know of are in A. peckiana and A. whestoneae.

Very best,

Rod

Thanks for the help Rod.
By: Hamilton (ham)
2010-08-16 11:03:11 PDT (-0700)

Since yesterday, the floccose material on the stipe has turned pinkish.

What about the very top of the stem?
By: R. E. Tulloss (ret)
2010-08-16 06:34:28 PDT (-0700)

Is the top of the stem MUCH more floccose that the already floccose parts we can see in the pictures? [Oh, I see the answer in the third picture.] I think this is an Amanita, and it belongs in Amanita section Amidella. Guessing at amidellas from pictures is hard to do, but I think there’s about a 75% chance of this being either A. volvata (if VERY DENSELY FLOCCOSE on the stem up under the cap) or a rather large specimen of A. pseudovolvata (if there is not a distinct increase in floccose material under the cap). [Added later: This is probably A. pseudovolvata. The top of the stipe is not like that in a young, fresh A. volvata. Also, the marginal striations on the cap are more pronounced in a young pseudovolvata (as here) than in volvata.]

Amanita section Amidella has an appendiculate margin (goop hanging from the edge, at least when young) as in sect. Lepidella and, in addition, the amidellas have a striate cap margin, almost always many squarely cut-off (truncate) short gills [pbreaks the supposed rule for amyloid spores going with attenuate (more or less gently narrowing) short gills], a totally elongating stem (as in inamyloid sections Vaginatae and Caesareae), and a multiply layered and robust volval sack.

Very nice, diagnostic pictures.

Very best,

Rod

Created: 2010-08-16 00:25:07 PDT (-0700)
Last modified: 2010-08-16 10:58:38 PDT (-0700)
Viewed: 120 times, last viewed: 2016-11-20 19:20:48 PST (-0800)
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