Observation 2156: Tyromyces chioneus (Fr.) P. Karst.

When: 2007-01-27

Collection location: Albion, California, USA [Click for map]

Who: Douglas Smith (douglas)

No specimen available

I didn’t do the id here, but these confused me for a bit, since they are not listed in index fungorum. But Tyromyces chioneus is listed, and there are photos of T. chioneus on the web if you do a google search. They remind me of O. fragilis, and that used to be Tyromyces fragilis. So, if that is now Oligoporus. I guess there is no reason why this isn’t. But index fungorum still needs to be updated there if this is true.

(Plus I’m not really big on the whole Tyromyces/Oligoporus thing. The polypores lately, what is going on? There seems to be a new genus everytime I look.)

Proposed Names

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Recognized by sight
83% (1)
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Add Comment
White rotters and brown rotters
By: Nathan Wilson (nathan)
2007-02-03 12:10:53 EST (-0500)

Tom Volk has a pretty good discussion of the issue around polypores at:


For this particular case, here’s what he say:

‘There are often “sister” genera in the polypores, with seemingly identical characters, except that one causes a white rot and one causes a brown rot. A good example of this is Tyromyces, which causes a white rot and Oligoporus, which causes a brown rot. This distinction is also used in the Agaricales, where, for example, Pleurotus causes a white rot and the closely related Hypsizygus causes a brown rot.’

Created: 2007-02-01 14:05:33 EST (-0500)
Last modified: 2007-02-03 01:06:57 EST (-0500)
Viewed: 59 times, last viewed: 2018-01-22 10:00:18 EST (-0500)