Abstract
Evernia prunastri produces isotomic dichotomous branches at annual intervals in the Willamette Valley of western Oregon, as determined by photographic study and correlations between tree ring counts and lichen thallus branch counts. Branch points can be counted to determine the age of individual thalli. Besides the main dichotomous branches, a variable number of anisotomic adventitious branches is producedfrom older branches. A small amount oferror in age determinations is introduced by occasional irregularities in the branching and previous physical damage to the thallus.
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