Bowler P.A. & Rundel P.W.
(1978):
The Ramalina farinacea complex in North America: chemical, ecological and morphological variation,
Bryologist,
81(3): 386-403
Ramalina farinacea (L.) Ach. is most abundant along the coastal regions of North America from approximately 30-60°N latitude. All of the five European chemical races are present in the New World in addition to unreported combinations of diagnostic acids. An analysis of morphological variation in chemical lines showed them to be indistinguishable. There is evidence of a latitudinal gradient in the abundance of the chemical races, and different substrate preferences are exhibited in different regions …
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