Observation 100230: Amanita sect. Vaginatae sensu Zhu L. Yang

When: 2012-07-14

Collection location: Bad Godesberg, Germany [Click for map]

Who: deuteragenie

No specimen available



Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
You’re welcome.
By: R. E. Tulloss (ret)
2012-07-17 07:14:11 -05 (-0500)


By: deuteragenie
2012-07-17 03:09:58 -05 (-0500)

Thanks for this list – very useful.

In my opinion this is Amanita vaginata
By: ThKgk
2012-07-16 16:59:35 -05 (-0500)

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 07:35:08 -05 (-0500)






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.


Another possibilities:
By: Gerhard Koller (Gerhard)
2012-07-15 07:05:01 -05 (-0500)

Amanita pachyvolvata or Amanita magnivolvata.

More info
By: deuteragenie
2012-07-15 06:55:07 -05 (-0500)

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 05:31:38 -05 (-0500)

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.

By: deuteragenie
2012-07-15 03:49:30 -05 (-0500)

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.

By: deuteragenie
2012-07-15 03:43:31 -05 (-0500)

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 22:34:36 -05 (-0500)

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.


I agree that this cap color…
By: R. E. Tulloss (ret)
2012-07-14 22:28:09 -05 (-0500)

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?


Beautiful photography
By: good luck 2U (donaldjohnston)
2012-07-14 16:45:46 -05 (-0500)
I am not really pleased with this name here,
By: Gerhard Koller (Gerhard)
2012-07-14 16:40:12 -05 (-0500)

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 16:35:03 -05 (-0500)

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

Created: 2012-07-14 12:23:00 -05 (-0500)
Last modified: 2012-07-17 10:17:53 -05 (-0500)
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