Observation 277906: Amanita sect. Amanita

When: 2017-05-28

Collection location: Culpeper Co., Virginia, USA [Click for map]

38.53°N 78.15°W [Click for map]

Who: Penny Firth (pfirth)

No specimen available

Notes:
Fruiting on thin soil, road-cut. Cap ~6 cm.

Images

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Comments

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The marginal striations are the radial grooves that allow some amanitas to get…
By: R. E. Tulloss (ret)
2017-06-03 20:35:02 PDT (-0700)

some extra cap expansion in an “umbrella-like” manner.

The ration of striation length to cap radius is useful is separating some groups in the Vaginatae.

Very best,

Rod

There’s a species in section Amanita…
By: Dave W (Dave W)
2017-06-03 19:36:22 PDT (-0700)

that shares at least some characteristics with the mushroom seen here. Amanita albocreata completely lacks a ring/partial veil, and has a cap that’s whitish toward the margin and yellowish on the disc. But this species has a strongly striate cap margin. I’t difficult to tell for the photos here what percentage of the cap radius is striated and how prominent are the striations.

yup.
By: Debbie Viess (amanitarita)
2017-06-03 14:34:45 PDT (-0700)

slice it right down the middle, forming two matching halves. that way you can see if there is a true bulb, or just a thickened volva covering the base. with a perfectly straight stipe in the middle.

I believe
By: Penny Firth (pfirth)
2017-06-03 14:00:07 PDT (-0700)

that it had a bulbous base, however I did not collect it. Cap margins looked striated (does this just mean the gills show through from a top view?)

I will go back to the site of the various Amanita fruitings first thing tomorrow and see if there are more of these.

Debbie, what do you mean by “section”? Cut the bulb in half and photograph it? Thanks.

Roadcut, poor, sandy soil.

Penny

looks like another bulb
By: Debbie Viess (amanitarita)
2017-06-03 10:53:51 PDT (-0700)

can you section?

Hello, Penny.
By: R. E. Tulloss (ret)
2017-06-03 08:04:46 PDT (-0700)

I’m having trouble with the cap margin…can’t be sure if I see striations. Also, I can’t tell if the stipe base is bulbous or not. Can you help on these matters?

Very best,

Rod

Created: 2017-06-02 08:41:59 PDT (-0700)
Last modified: 2017-06-03 19:42:31 PDT (-0700)
Viewed: 81 times, last viewed: 2019-08-13 00:16:21 PDT (-0700)
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