COMMON TARCRUST

Diatrype stigma
DIATRYPACEAE FAMILY (Diatrypaceae)

Description
This fungus has a blackish-brown to black surface that is shiny, finely roughened to smooth, and sometimes minutely cracked. Tiny bumps on the surface indicate the locations of the fruiting body (perithecia) embedded in a white flesh. The black crusts of this fungus are variable in shape and are up to 10 inches or more long and are very thin.

Occurrence
This fungus forms sheet-like growths on decaying hardwood branches year-round. This is a common fungus on oaks, and maples where the fungus often encircles the branches.

Comments
It gives the impression that the wood is burned. When magnified with a hand lens the tiny bump like pores of the embedded perithecia can be seen all over the surface of the fungus.

Disclaimer: The content of NatureSearch is provided by dedicated volunteer Naturalists of Fontenelle Nature Association who strive to provide the most accurate information available. Contributors of the images retain their copyrights. The point of contact for this page is: Eric Scholar.