Fissure
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1. Bark that is furrowed and ridged, or splitting lengthwise.
An example of a tree exhibiting fissures.
Source: http://whitecanker.net/WhiteCanker.asp
Bark fissures form on maturing trees. These bark plates only divide in a lengthwise direction.
Source: http://www.treedictionary.com/DICT2003/HTMLFILES/fissures.html