Observation 139489: Amanita austrostraminea D.A. Reid

When: 2013-07-10

Collection location: Keaiwa Heiau State Recreation Area, Oahu, Hawaii, USA [Click for map]

Who: P. Hill (phill)

No specimen available

The pileus and stipe is very scabrous (scaly) and farinose (powdery).
The pileus surface warts form regular broken rings of dashes veil material.
There are abundant appendicular veil pieces on the pileus edge.

The stipe has a (abruptly) marginate bulbous base yet with a distinct zone of remnant volval “rings” above or just breaking away from the base.
The stipe generally exhibits a “two tone” form with a farinose, tomentose or scabrous area above any ring(s) with the rings on the otherwise smoother lower stipe.

Habitate is a mix of “second growth” forest of introduced species including eucalyptus trees.

There may be more than one eucalyptus tree species, but the largest run to 1.5 meters diameter possible more with a heavy bark on the lower trunks not unlike a cottonwood tree. Interestingly some of the bark appears to have been harvested in large sheets in various places in the forest. Possibly this thick bark and its harvesting is a clue to the species.

Species Lists


Note the “ring” breaking from the bulbous base.
Looks Amanitoid to me.
Note Skirt, Annulus, and Bulbous Base with change in texture above and below ring.
Another Example of the base detail.The photo is too gray to reflect the natural colors. The dirt of O’ahu is red and the dried leaves are brown.
Cap Color not always completely white.This is another photo where the dry leaves appear too gray, so the cap would be a bit more tan than in this photo.
Another shot of the gray cap that is probably more tan, if we saw it in person, because the dried leaves look too gray in this picture.
Very Large Bulbous BaseThis photo also shows the red earth typical of O’ahu.
There is some lavender color in breaks in both the bases. Check the large or original photo closely and you’ll see it.
Example of the best color. The shaddy side of the bulb is darkest lavender example. The broken bit on the lower right has a bit of lavender color on the outside, but none yet on the break which was caused by me.White Balance discussion:To me this color does not look brown enough; it looks a bit g...
A few of the caps were splitting radially.
A good example of floccose veil remenants on pileus, the skirt, the rough stipe, the ring and bulbous base.(Color Note: This looks like a close match to the natural color to me)Also note the yellowy brown discoloration in the gills. This also appears in a few other photos.
This shot shows all the features while still in the ground.The colors aren’t perfect. The dry leaves are browner than shows in this picture.Even without good color there is yellowy brown in one area of the gills.
A handsome shot showing many features.The layered cuticle of the stipe looks interesting. This species just doesn’t go for a simple smooth outer layer on any surface.
A short example
Shot from below showing gills, split cap, base along with the red earth of O’ahu.

Proposed Names

60% (2)
Recognized by sight
81% (1)
Eye3 Eyes3
Recognized by sight: Dr. Tulloss identified other samples from this same area picked within days of when I took this photo without further analysis the assumption is they are all the same “Australian Straw-colored Amanita”.
54% (1)
Used references: R.E.T. said so :)

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I have posted a name that encompasses the material with the appendiculate cap margin.
By: R. E. Tulloss (ret)
2013-07-11 21:36:30 BST (+0100)

I have real difficulty with your question of two species or one.

At first I thought that the underlying color of the caps (below the volval material) was different in the two groups of shots; but now I am not so certain. I thought that the bulbs might have different shapes. The short bulbs seem to have closely spaced faint ridges encircling the bulb.

I suggest that you collect some of larger “short” ones (say with the cap beginning to separate from the bulb). Then wrap their bulbs in thoroughly dampened paper towels (but not running with water). Put extra thoroughly damp paper towels (not running with water) into the bottom of the of a paper cup or other vessel and nest the bases of the wrapped specimens into such a cup or cups. Cover the specimens with a loose tent of (e.g.) waxed paper.

Now you are set up to see if you can grow the “buttons” into expanded, mature, fruiting bodies (basidiomes, mushrooms). In Amanita this “expanding” at home trick often works in a day or two.

Then you should have more clues of whether you are looking at two stages of the same mushroom or…two mushrooms.

Very best,


Two or One Species?
By: P. Hill (phill)
2013-07-11 19:54:40 BST (+0100)

Special thanks to Rod for the help.

Is there any reason to suspect from what I have here are not all the same species?

I’m wondering about the slim ones versus the squat ones, but I don’t have lots of details of the squat ones; they might grow up to be just like the tall ones.
It is the squat ones with the slow lavender color change which my amateur attempts at keying didn’t turn up and it is taller slender ones with all the scales, flakes, rough pileus edge etc. that aren’t matching either.

I only spotted the lavender on the one set.

A general note about colors. The colors aren’t perfect. The dry leaves are browner than shows in some of of the pictures. The browner photos look like a better match to me.

By: R. E. Tulloss (ret)
2013-07-11 14:55:56 BST (+0100)

Your notes really help. This species belongs in __Amanita__sect. Lepidella, but it is not A. manicata.

Amanita marmorata is a species of section Phalloideae with a membranous volva that normally leaves no remnant on the cap. Its cap has a marbeled, gray-brown and white coloring. The edge of the cap does not have hanging floccose bits of the universal veil on the edge as is the case with your material.


Amanita manicata is very distinctive because of the presence of what looks like a sleeping hedgehog under the partial veil (ring, annulus, skirt) on the stem.


From what I know of amanitas in Hawaii. The species you depict has not been previously identified in lists of Hawaiian species. It is probably a species imported with some non-native tree or trees.

If you can collect and dry material of the species you have depicted, there are a number of persons who would be interested in examining the material. I am one of them. Another is Dr. Don Hemmes (University of Hawai‘i at Hilo). Another is Dr. Dennis Desjardin (San Francisco State University, San Francisco, CA).

Very best,

Rod Tulloss

Some ideas
By: P. Hill (phill)
2013-07-11 06:51:56 BST (+0100)

It seems a bit like Amanita abrupta, possible Amanita manicata (that is not a recognized name on MO, see listing after link on amanitaceae.org), so I’m going with Amanita marmorata for now.

Created: 2013-07-11 06:25:33 BST (+0100)
Last modified: 2016-06-22 03:32:38 BST (+0100)
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