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Index of Subjects I would say this is classic Top Rot, a type of Heart Rot; the arms of the stars are where the lignified core extended into branches. See http://www.cals.ncsu.edu/course/pp318/profiles_mirror/decay/decay.htm For an explanation of the dark colour, see See http://www.forestpathology.org/decay.html - it is due to removal of cellulose by the fungi, leaving a core of oxididized lignin's; the living sapwood is resistant, so decay takes place at the heart. Quoting nancy dowd <nancypdowd@gmail.com>: > I am having this large decaying Red Maple taken down at the camp. > http://www.flickr.com/photos/92981528@N08/11187219615/ > > The star-like rot pattern in the piled upper overhanging limbs is intriguing. > http://www.flickr.com/photos/92981528@N08/11187219945/ > > I am guessing a fungus penetrates from an outside wound (i.e. dead > branch) and spreads to the centre. Then makes further wedges > outwards towards other parts of the trunk. Or maybe all the points > are from separate wounds that lead in to the heartwood? Could a tree > person explain how such a pattern of decay occurs? > > Thanks, Nancy > > > > > David Patriquin http://versicolor.ca
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