Observation 71057: Amanita ochrophylloides D.A. Reid
When: 2011-05-05
No herbarium specimen

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talk about disparate distributions…
By: Debbie Viess (amanitarita)
2011-07-07 08:34:13 PDT (-0700)

Central America to OZ. Very cool.

what features separated it into lepidella rather than validae?

by “naked foot” I assume that you mean that there is no obvious volva on the stem base…but that can be true of some of the valida, too, novinupta comes to mind. Here’s a novinupta photo by Richard Sullivan that looks quite similar to this, minus the spectacular gill color, of course…

http://mushroomobserver.org/image/show_image/138561?obs=64750&q=5Nat

the appendiculate margin on Kari’s amanita is another diff…but here’s a novinupta that seems to show that feature as well:

http://mushroomobserver.org/45513?q=5Nat

Not doubting you, Rod, just curious. I’m sure that you also saw the similarities to section validae…

Not Validae…
By: R. E. Tulloss (ret)
2011-07-06 19:21:20 PDT (-0700)

The species underdiscussion on this observation are in subsect. Gymnopodae (naked foot) of sect. Lepidella. They often have yellowish or ochre gills, a nasty odor, and a staining reaction. There are only a few of them in the world. I just co-authored a new member of this group from Central America with Roy Halling and Greg Mueller. It will be out in the Mycotaxon issue after the next one. In the meantime, a draft of the description is on-line at

< http://www.amanitaceae.org/?Amanita_conara >

The list for subsection Gymnopodae can be found here:

< http://www.amanitaceae.org/?subsection_Gymnopodae >

Very best,

Rod

Thanks, Kari.
By: R. E. Tulloss (ret)
2011-07-06 19:14:48 PDT (-0700)

Since you mentioned comparing the spores of ochrophylla and _ochrophylloides, I added a sporograph comparison figure in the discussion of ochrophylloides here:

< http://www.amanitaceae.org/?Amanita_ochrophylloides >

The spores are fairly distinguishable when you take shape into account as well as size. Bas suggested that the length/width ratio of a spore can be used to provide a numerical meaning for qualitative terms like “globose” and “ellipsoid.” This wa back in 1969. In the sporographs, the sloping sides of the boxes representing spore size and shape correspond to these ratios.

In the case of the two specie under discussion Bas’ measurements for ochrophylla are comapred to Reid’s measurements for ochrophylloides. The two sets of data segregate pretty well in the combined sporographs.

Very best,

Rod

what a lovely fat amanita!
By: Debbie Viess (amanitarita)
2011-07-06 18:59:26 PDT (-0700)

bulbous stem, indeed.

is this one of the reddening amanitas, section validae?

PS
By: Kari (Kari)
2011-07-06 18:19:22 PDT (-0700)

Hi again Rod,

I forgot to mention that Australian myco-man Bill Leithhead (see his website) claims that the stem of A. ochrophylloides is much more bulbous in young specimens. But he agrees that these two Amanitas are difficult to tell apart in the field…

Bye for now,
Kari.

Amanita ochrophylloides ID
By: Kari (Kari)
2011-07-06 18:10:20 PDT (-0700)

Hi Rod,

Thanks for your comment, glad you liked the photo.

Regarding the ID – my “mycological bible” is Bruce Fuhrer’s “Field Guide to Australian Fungi,” and when differentiating between A. ochrophylloides and A. ochraphylla, he states that in the latter, the annulus is attached just below the gills, whereas in the former, the annulus occurs lower down on the stipe.

The two are quite difficult to tell apart by sight, I can assure I ummed and erred before settling on this tentative ID. The spores of A. ochrophylloides are apparently a little smaller, so a microscope will surely give a more definite ID!

Cheers,
Karin (Kari)

Very nice image, Karl.
By: R. E. Tulloss (ret)
2011-07-06 04:16:11 PDT (-0700)

How did you decide on the ID?

I looked at the three different observations listed for ochrophylloides on MO. The impression is of three very different mushrooms.

Dr. Halling’s photograph looks the most like the color drawing in Reid’s 1980 monograph on the amanitas of Australia (p. 91, figure 94). The dark warts on the pileus in your photograph are mentioned in the original description of the species. My eyes are not what they were, but I think I can detect yellow on the gills (there seems to be a reddish reflection coming from somewhere). Do you have a shot of a cross-section of the mushroom showing the gill color? Can you tell us anything about the variation you see in this species?

We recently added data from Reid’s original description of A. ochrophylloides to the technical tab here: < http://www.amanitaceae.org/?Amanita_ochrophylloides >.

I have really enjoyed the photographs of Australian species on MO in recent years. TMy thanks to you and other the other MO-participating citzenry of Australia.

Rod

Created: 2011-07-05 20:25:01 PDT (-0700)
Last modified: 2011-07-07 08:34:31 PDT (-0700)
Viewed: 181 times, last viewed: 2016-08-14 20:52:04 PDT (-0700)
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