Observation 18503: Amanita merxmuelleri group
When: 2009-01-15
No herbarium specimen

Notes: By itself in lenga forest; CAP 4-5" wide, smooth, striate at margin, white felt universal veil patches persistant; FLESH no odor, bruising slightly yellowish-brown at base of stipe.

Proposed Names

42% (2)
Eye3
Recognized by sight
ret
54% (1)
Eyes3
Used references: original descriptions of A. merxmuelleri and A. grauiana. Also, compared with the material later collected by Jason from near Ushuaia (Prov. Tierra del Fuego, Argentina), which seems a better fit to A. ushuaiensis. The story is not over.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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A tip of the hat to MObsters…
By: R. E. Tulloss (ret)
2009-03-28 14:51:38 PDT (-0700)

Because of mushroomobserver.org, Jason could post pix while he was in Chile and Argentina.

This led to communication on Argentine amanitas between us while Jason was in the field.

This led to Jason’s drying 4 collections of brown amanitas from the “bottom” of the world.

It appears that all the material collected in Prov. Tierra del Fuego is conspecific and, possibly, close to A. ushuaensis.

Posting a red-brown capped species and a pale olive-brown species helped me to realize that the far-southern species of sect. Amanita with large spores might not all fall into a single taxon.

All the detail that are available from a fine set of pictures turns out to be an overload when compared to the sparse original descriptions (particularly of ushuaiensis); so there are probably more questions and more microscopy to do than I suspected there would be. (Not really a bad thing.) Well, that’s not the first time that happened.

I bet Jason had a great cycling adventure; and I got to experience some of his discoveries second hand. I plan to blame a fair share of the experience on mushroomobserver.org

Rod

“lenga” = Nothofagus pumilio
By: Jason Hollinger (jason)
2009-02-24 09:25:05 PST (-0800)

Again, just for the record: N. pumilio forms vast monospecific forests (with maybe two or three shrub species in the understory) in southern Patagonia.

Also, note that the striations mentioned in the notes were very inconspicuous, and apparently aren’t visible at all in the photos.

See 18628
By: R. E. Tulloss (ret)
2009-02-20 07:19:14 PST (-0800)

See comments on Obs. 18628.

R

Please remind me what “lenga” is…
By: R. E. Tulloss (ret)
2009-02-19 13:51:05 PST (-0800)

Dear Jason,

I’VE EDITED THIS NOTE.

Please remind me what “lenga” is. At first I thought this species would belong in sect. Vaginatae; however, I can’t think of anything like this that is known from southern South America. It seems to me the marginal striations are very short or only show up at a point in expansion that is reached after you took these photographs. The part of the universal veil that is not dried in situ is grayish, the centers of warts seem a somewhat pallidly orangish cream. The undried universal veil on the stipe (bearing the imprint of the gill edges) is gray. This is a very interesting set of photographs. I understand that you don’t have a dried specimen. Was a dried specimen retained in Chile? I am working (when time permits) on a complete revision of Amanita for Argentina and Chile. I’ll take a look at the Ms. I think I should consider sect. Amanita as well as sect. Vaginatae for this taxon.

Very best,

Rod

Created: 2009-02-16 11:27:42 PST (-0800)
Last modified: 2009-02-16 11:27:42 PST (-0800)
Viewed: 110 times, last viewed: 2016-10-27 13:44:10 PDT (-0700)