Mycorrhaphium adustum
Mycorrhaphium adustum
Mycorrhaphium adustum
Mycorrhaphium adustum
Mycorrhaphium adustum
Found summer and fall growing from wood, this toothed
polypore has small, soft, white to tan spines that bruise when
handled.  Older collections will often have a black cap margin
and darker spines.  Stem, when present, is white and velvety.  
Spore print white.
See Mycorrhaphium adustum at
Fungi Growing on Wood
See also The Audubon Society Field
Guide to North American Mushrooms
,
1981, Lincoff, p. 435.