Fissure

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1. Bark that is furrowed and ridged, or splitting lengthwise.

2006-09-02%20Dead%20Linden%20tree%20in%20neighbor%20Mark%27s%20yard-6A.jpg

An example of a tree exhibiting fissures.
Source: http://whitecanker.net/WhiteCanker.asp


FISSURES.jpg

Bark fissures form on maturing trees. These bark plates only divide in a lengthwise direction.
Source: http://www.treedictionary.com/DICT2003/HTMLFILES/fissures.html