Observation 100230: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2012-07-14
No herbarium specimen

Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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You’re welcome.
By: R. E. Tulloss (ret)
2012-07-17 05:14:11 PDT (-0700)

R

Thanks
By: deuteragenie
2012-07-17 01:09:58 PDT (-0700)

Thanks for this list – very useful.

In my opinion this is Amanita vaginata
By: ThKgk
2012-07-16 14:59:35 PDT (-0700)

Have a look on the checklist of NWR http://www.lanuv.nrw.de/.... Amanita submembranacea and Amanita pachyvolvata are rare species in North Rhine-Westphalia and Amanita magnivolvata is a rare, unknown species in Germany, whereas A.vaginata is very common. So, what does really speak against A.vaginata? It is true that the colour of the cap somewhat greenish-olive, but this is a photo and the cap colour is always somewhat variable. Well, let it be a A. vaginata s.l.

Some links… [edited extensively]
By: R. E. Tulloss (ret)
2012-07-15 05:35:08 PDT (-0700)

http://www.amanitaceae.org/?Amanita+magnivolvata

http://www.amanitaceae.org/?Amanita+mortenii

http://www.amanitaceae.org/?Amanita+pachyvolvata

http://www.amanitaceae.org/?Amanita+sinicoflava

http://www.amanitaceae.org/?Amanita+submembranacea

I think cap color may eliminate magnivolvata. Cap color might also be a problem with pachyvolvata.

I am at a meeting concerning development of an on-line North American “Mycoflora” and may not be very interactive for the next few days.

R

Another possibilities:
By: Gerhard Koller (Gerhard)
2012-07-15 05:05:01 PDT (-0700)

Amanita pachyvolvata or Amanita magnivolvata.

More info
By: deuteragenie
2012-07-15 04:55:07 PDT (-0700)

Exact location: http://en.wikipedia.org/wiki/Siebengebirge.
Likely altitude the specimen was found : +/- 100m
I wouldn’t know about acidity. Siebengebirge is a rest of volcanoes. Rock type is trachyte.
Remains of volva seem to be thick for A. submembranacea.

My first thought!
By: Gerhard Koller (Gerhard)
2012-07-15 03:31:38 PDT (-0700)

Ret, this was my first thought: A. submembranacea. But it is a species of mountain habitats. Although I found it in 350 m a.s.l. once.
A little more details about the locality given would help. I mean we know by now beech/birch forest with conifers nearby (which would fit) but overall is the soil acidic or calcareous, how many meters a.s.l., how much humidity per year etc. aso.

Photography
By: deuteragenie
2012-07-15 01:49:30 PDT (-0700)

Thanks for the kind words on the photos. I plan to try to focus-stack the cap-focussed (1) and stipe-foccussed (2) photos and see if the result is worthwile. Hugin will be my friend this evening.

Habitat
By: deuteragenie
2012-07-15 01:43:31 PDT (-0700)

For all clarity, habitat is mixed hardwood forest – mainly beech and birch, although at that location, coniferous were not that far (maybe 15m).

I looked more carefully at the surface of the volva in the second photograph.
By: R. E. Tulloss (ret)
2012-07-14 20:34:36 PDT (-0700)

The surface has plentiful small flakes distributed on it and is not the rather smooth surface seen in taxa that are associated with the name vaginata. I would like to point out that the mature, graying volva of A. submembranacea has a surface that looks like a piece of coarse gray canvas flecked with bits of old paint. In a young, non-graying state that sort of volval surface might well give the appearance seen in the second photograph, in which the focus is on the surface of the volval sac.

R

I agree that this cap color…
By: R. E. Tulloss (ret)
2012-07-14 20:28:09 PDT (-0700)

would seem to place this specimen outside the group of grayish or brownish-gray taxa to which the name vaginata is most often given in recent literature in Europe. If this were an eastern North American collection, the color might suggest sinicoflava; and then I’d wait to see if the volval sac would turn gray. In central Europe, a cap that is somewhat olivaceous that is also associated with a graying volva might suggest A. submembranacea, I know this taxon from the literature and from a detailed examination of the type collection (almost 20 years ago, now). I have never seen A. submembranacea in fresh condition, which I regret. I hope someday to have the opportunity to collect in Europe again.

Gerhard, what do you think of the possibility that this collection could be submembranacea in a young stage in which the volva is not yet turning gray?

Rod

Beautiful photography
By: good luck 2U (donaldjohnston)
2012-07-14 14:45:46 PDT (-0700)
I am not really pleased with this name here,
By: Gerhard Koller (Gerhard)
2012-07-14 14:40:12 PDT (-0700)

what was habitat? Again beech/birch forest?
A. vaginata is a real tough complex of species which are very difficult to separate. A. vaginata is rather an aggregate of species. The real vaginata is not that greenish-olive.
You shouldask Ret about this find.

Stipe hollow ?
By: deuteragenie
2012-07-14 14:35:03 PDT (-0700)

Shouldn’t the stipe be hollow for A. vaginata ?

Created: 2012-07-14 10:23:00 PDT (-0700)
Last modified: 2012-07-17 08:17:53 PDT (-0700)
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