Observation 18642: Amanita Pers.
When: 2009-02-18
Herbarium specimen reported

Notes: Single specimen found under live oak, somewhat waterlogged. White cap 6.3 cm across,no warts and no sign of an annulus. White spores, not amyloid, and approx. 9.4 X 6.5 microns. Some knife wounds on the base and stem but it does have a volva with a slightly enlarged base.

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Ocreata was my first choice but….
By: Ron Pastorino (Ronpast)
2009-02-22 19:06:00 SAST (+0200)
It would seem to have two strikes against it. There were plenty of spores dropped and they did not darken in Melzers, which if I recall correctly is usually a quick reaction with this species. Also, the specimen was growing fairly well protected and I didn’t see any annulus or annulus fragments around it. However, it can’t be ruled out on that point alone. I don’t recall if the stipe was chambered or not but it dried up rather uniformly. The spores seemed boringly Amanita-like and maybe slightly too elliptical for ocreata.
cut it in half…
By: Debbie Viess (amanitarita)
2009-02-21 02:56:42 SAST (+0200)

check to see if the stipe is solid or with discrete, hollow chambers (I’ll post an illustration of what i mean). if so, could be an ocreata sans annulus; recheck for an amyloid rxn.

if base is bulbous, only section phalloides (ie ocreata) would have a membranous volva (apparent in your photo at top of bulb), altho a white phase section amanita is a possibility, since your specimen is so rain-beat and details are obscured. can’t be section vaginata (ie velosa) with a bulb.

spore shape or photo?

under live oak, with the general gestalt and timing, ocreata is the most likely choice.

Created: 2009-02-20 07:26:55 SAST (+0200)
Last modified: 2009-02-20 07:26:55 SAST (+0200)
Viewed: 63 times, last viewed: 2017-02-04 19:29:11 SAST (+0200)