Small white possibly Amanita with signs of yellow staining below the pileus.
The stipe broke away from the cap like chalk snapping. (similar to the Russula habit.) Not sure if I have seen this yellow staining before, except for a recently loaded Amanita from the same area in the rainforest that had a yellow ring on the partial veil on the stipe.. The fungi was growing on the rainforest floor, but not tending to show it was attached to wood as far as I could see,
although it was amongst the forest floor root system which was well evident above and below the surface…


Rod, This is the actual RAW file as is, (original without post processing).
My screens are calibrated with a Spyder and I can see the Yellow staining clearly in this image. I will check the dried specimen with a magnifying glass later this evening when I return from Wilsons River Primitive Reserve.

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Yes, I understand.
By: R. E. Tulloss (ret)
2014-04-19 11:11:52 CDT (-0500)

This also suggests that there may have been some alternation of the tissue in the to of the stipe that made it easier for it to break below the yellow zone…although that is just a guess on my part.

Very best,


Yellow Staining

Rod, just home from a long days photoshoot. After rechecking the images I think what is the problem is, that the images “without” the yellow staining on the stipe is because when I separated the pileus from the stipe the section of the stipe with the Yellow remained attached to the pileus and the short section of the stipe does not represent the Full stipe, and therefore no yellow is evident. The small section of the stipe still attached to the pileus and hidden is the section with the yellow.{see image 73421.} (hope this makes more sense.)

Hello, Ian.
By: R. E. Tulloss (ret)
2014-04-18 09:26:43 CDT (-0500)

I wrote to you and a few others this morning to tell you the decisions that I have made about processing Australian collections of amanitas.

I didn’t mention that, specifically, I am interested in all the recent material of Amanita that you are posting and successfully drying.

Very best,


I don’t get why the images with the upper stipe in the shade show that region yellow.
By: R. E. Tulloss (ret)
2014-04-18 08:13:28 CDT (-0500)

However, when the upper stipe is lit directly, it is white. That doesn’t look like a yellowing reaction in the mushroom. It looks like a photographic artifact.

Help me with this please.

Very best,


Summary Notes

Reads like the specimen loaded (obs: 163587)Is it a common occurance in Australia Rod?.Chow, kk

The difficulty with yellow-staining in amanitas is that sometimes (at least) it’s not …
By: R. E. Tulloss (ret)
2014-04-17 22:20:12 CDT (-0500)

controlled (entirely) by the mushroom’s genes. It can be provoked by some other organism or organisms. See my notes on the yellowing syndrome on this page:

In North America, at least two taxa originally described as yellow-staining amanitas are based on normally non-staining species infected and distorted by one or more agents that cause dramatic yellowing.

There are Australian species described as yellowing. I am suspicious that these may be cases of the yellowing syndrome. I have seen evidence of this syndrome in African and east Asian amanitas as well as here in Central New Jersey.

Very best,


Created: 2014-04-17 21:21:49 CDT (-0500)
Last modified: 2014-04-18 16:42:37 CDT (-0500)
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