When: 2008-06-09

Collection location: Big Thicket National Preserve, Polk Co., Texas, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

This specimen had the general appearance of Gyroporus castaneus but the main characteristic were the yellow spores, ( appeared to be the right size and shape), which eliminates most other possibilities.

Species Lists


Proposed Names

-29% (1)
Used references: North American Boletes and several other web sites
57% (1)
Used references: Mushrooms of the Southeastern United States; A. Bessette, W. Roody, A. Bessette, D. Dunaway

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= Observer’s choice
= Current consensus


Add Comment
NICE — that’s how it should be done!!
By: Dimitar Bojantchev (dimitar)
2008-08-15 17:22:47 CST (+0800)

Great job Ron. I’m the bad guy usually, the one who complains that things are not done right, but let there be an exception — this is how it should be done!!

The yellow spores are very telling and a key characteristic that eliminates a tremendous amount of empty speculation.

Renaming to Xanthoconium affine var. affine
By: Ron Pastorino (Ronpast)
2008-08-13 06:36:24 CST (+0800)

Added photos of spore mass and spores from microscope. I believe that the bright yellow-brown color of the spores and the overall characteristics of the specimen are more of a match for the Xanthoconium affine

Maybe a Xanthoconium
By: Ron Pastorino (Ronpast)
2008-06-23 10:59:51 CST (+0800)

Thanks Tom. In looking at the spore mass again the more concentrated areas do have a more brownish yellow color. I don’t see a Gyroporus alternative but Xanthoconium affine looks fairly close. The cap and stem coloring seems closer also. I also think the spore size and shape is closer to X. affine. Any other votes?

different Gyroporus?
By: Tom Volk (TomVolk)
2008-06-23 03:19:48 CST (+0800)

Hi Ron, these have a very different coloration and cap shape from what we see up north in Wisconsin. Maybe a differnt Gyroporus species?