Observation 20393: Amanita luteofusca Cleland & E.-J. Gilbert
When: 2009-04-16
No herbarium specimen

Notes: I took the plunge and nominated Amanita, but that is about my limit. I did notice for some reason, maybe reflected light, that the mantle shows light mauve in one shot, and definately leaning towards brown in the other.
I think I’ll leave this one for some judication. Debbie if you have time can you help out again. Ta KK

Images

41405
Copyright © 2009 Ian Dodd Kundabung NSW Australia
41406
Copyright © 2009 Ian Dodd Kundabung NSW Australia
41407
Copyright © 2009 Ian Dodd Kundabung NSW Australia

Proposed Names

28% (1)
Eye3
Used references: unable to match
ret
78% (2)
Eye3 Eyes3
Used references: Reid, D. A. 1980. A monograph of the Australian species of Amanita Pers. ex Hook. (Fungi). Austral. J. Bot., suppl. ser. 8.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Field Microscope

Rod & Gerhard, to reply to both of your helpful advice I have been chasing up a Nikon field Microscope called The Nikon H. It was produced several years ago and only a limited number were made. Needless to say they are like hen’s teeth. Occasionally one turns up usually on the net. They attach directly to the Nikon camera bodies and I believe the magnification factor is 20.(dont quote me.)

luteofusca…
By: R. E. Tulloss (ret)
2009-04-18 17:49:16 BST (+0100)

After re-reading the descriptions of all the similar fungi listed by Reid in his 1980 monograph, I think the closest possibility to Ian’s picture is A. luteofusca; however, there is only one photograph of the species (Reid seems to have seen it fresh only twice) and the specimen depicted is neither as young or as fresh as that photographed by Ian. One character that is mentioned by Reid that is missing from Ian’s photo is a character that is also missing from Reid’s pic — a thin layer of white hyphae that Reid describes as being easily lifted off of the gray volval powder on the cap. Ian, perhaps you’ll see a thin (almost paper-like, but probably thinner than paper) white layer on a cap of this species in future. The spores would be very distinctive for luteofusca in that they are about as round as those of A. virosa or A. bisporigera. Given the streaky (virgate) cap and the thin external membrane of the universal veil, one cannot avoid the thought that this species of sect. Validae may be as basal to that section as (e.g.) A. citrina or A. porphyria — in that it has preserved spores and an external volval layer suggestive of an ancestor in common with (possibly “in”) the Phalloideae.

Very best,

Rod

placing to section…
By: R. E. Tulloss (ret)
2009-04-18 17:06:53 BST (+0100)

A pulverulent grayish volva, a bulb at the stipe base, a persistent skirt-like ring on the stem, reduces the possibilities to sect. Amanita or sect. Validae. A lot of the time, a nonstriate cap edge would point to the Validae, but not always. Maybe carrying away a small pie-slice of the cap in a little fold of paper would be possible for our friend, the heavily laden photographer from Oz. Then a bit of iodine could separate subgenera in Amanita. I think Reid’s monograph on amanitas (largely from Victoria) has pictures suggestive of this fellow…. More later.

Rod

you’ve nailed the genus, Ian.
By: Debbie Viess (amanitarita)
2009-04-18 16:00:43 BST (+0100)

as to species…I will leave that to those more expericenced with the “Amanitas of OZ” (hmmmmmm, do I hear the sounds of a future talk here?).

Interesting that you noticed color changes from mauve to brown…we show a similar perceived color spectrum in our North American amanita sp. porphyria, altho I am NOT suggesting that as a possibility for what you have here.

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