Observation 95542: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2012-05-08
Who: zaca
Herbarium specimen reported

Notes: The specimens considered in observation 95540, observation 95541 and observation 95542, were not growing together, but all were within a circle with radius of 50 m .

For the specimen in this observation, I got the following dimensions of the spores:
(9.3) 10 – 11.7 (11.9) x (8.6) 8.8 – 10.4 (10.8) µm
Q = 1 – 1.2 (1.3) ; N = 23
Me = 11.1 × 9.6 µm ; Qe = 1.2.

Proposed Names

41% (3)
Recognized by sight: inner membranous volva stained orangish.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Thanks, RET,
By: zaca
2012-06-05 20:28:06 CEST (+0200)

for the comments added.
Concerning the last one, maybe the only one from my recent observations whose color I could describe as “greyish olivaceous” was the specimen in observation 95558. All the others seem to be different colored.

It should be added that
By: R. E. Tulloss (ret)
2012-06-05 19:58:26 CEST (+0200)

the cap color in Piane’s original illustration of malleata is grayish olivaceous.

R

The spore shape is consistent… [edit]
By: R. E. Tulloss (ret)
2012-06-03 00:36:27 CEST (+0200)

with the shape of the spores of most of the taxa in stirps Malleata.

R

PIleipellis
By: R. E. Tulloss (ret)
2012-06-03 00:33:33 CEST (+0200)

No amanita in sect. Vaginatae is known to have sphaerocysts in its pileipellis. What is more probable is that sphaerocysts of the universal veil remain attached to the pileipellis due to delayed, weak, or very limited gelatinization of the pileipellis.

I will do a little further checking for you in the literature.

R

Dear RET,
By: zaca
2012-06-02 23:04:39 CEST (+0200)

Thanks for trying to help.
I was very surprised with the amount of species of Amanita in section Vaginatae that I saw at the time of this observation. Maybe by different motives, I have already tryed to get more information beyond the stirps Malleata. During this search I got a paper by GIUSEPPE VENTURELLA, ALESSANDRO SAITTA & MARCO CONTU, where they consider four species in Section Vaginatae: A. dryophila, A. mairei, A. pseudolactea and A. separata, and conclude from there that the shape of the spores of A. dryophila are very similar to those of my specimens. Another feature that agrees with my specimens is the existence of abundant spherocysts in the pileipellis. But, I´m not sure if this is the species that we look for, because all the are characteristics are very close to the species in stirps Malleata. Maybe, I will never know.

A little more info… [edited] [edited again]
By: R. E. Tulloss (ret)
2012-06-02 04:58:42 CEST (+0200)

Amanita malleata, A. lividopallescens var. tigrina, and A. lividopallescens var. malleata (not a nomenclatural synonym of A. malleata) are three of a number of synonyms for Amanita malleata. The results of studies of the three types have been published (Tulloss 1994) and relevant material is on the WAO site:

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

The exact meaning of A. lividopallescens sensu stricto has been under a great deal of discussion at times.

There is a famous color plate created long after the name was originally proposed. The voucher specimen from which the watercolor (basis for the plate) is in Paris (PC); and I have examined it. The plate doesn’t seem to represent the taxon in the original description. I posted only a smattering of detail on Boudier’s collection here:

http://www.amanitaceae.org?Amanita+lividopallescens+sensu+Boudier/...

The orangish color in the present material is a little suggestive of A. dryophila:

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

You might also want to look at

http://www.amanitaceae.org?stirps+Malleata

[addition]

The saccate volva of all the taxa in the provisional stirps Malleata is usually rather weak and graying, which doesn’t seem to be the case here. I would suggest doing a little checking beyond stirps Malleata.

Very best,

Rod

That was also my impression.
By: zaca
2012-05-27 15:12:17 CEST (+0200)

Thanks, Irene.

A. malleata
By: Irene Andersson (irenea)
2012-05-27 07:21:58 CEST (+0200)

I hadn’t heard of malleata before, but when I read descriptions and looked at pictures, it seems possible that it’s another colour form of lividopallescens – only more greyish, and the inside of the volva also turning grey.
They have the same kind of fragile volva, and the strongly fading cap colour with age. Interesting too that you find them both together..

Thanks; Debbie and Irene.
By: zaca
2012-05-26 22:07:53 CEST (+0200)

What are the differences between A. lividopallescens and A. malleata?
That day and four days latter I found many more than I posted and I believe that the main difference between them was the coloration of interior of the volva. Some, like in these three observations #95540-1-2, the inside of the volva was more or less orangish, but in others it was white and becames greyish when drying.

Good call, Debbie!
By: Irene Andersson (irenea)
2012-05-26 21:30:27 CEST (+0200)

lividopallescens was my first impression too, and I beleive that all the three obses (-40, -41, -42) are the same species.

Yes, mainly Quercus.
By: zaca
2012-05-26 19:28:39 CEST (+0200)
with hardwoods?
By: Debbie Viess (amanitarita)
2012-05-26 19:23:06 CEST (+0200)

Created: 2012-05-26 18:36:24 CEST (+0200)
Last modified: 2012-06-02 05:01:42 CEST (+0200)
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