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Sigal, Lorene L/ Nash, TH ", III 1983: Lichen communities on conifers in southern California: an ecological survey relative to oxidant air pollution. - Ecology 64: 1343-1354. [RLL List # 120-123 / Rec.# 17303]
Abstract: 9 tables. 5 figures. [Authors report a 50% decline in lichen diversity since the early 1900's, and " sites with high oxidant levels, marked morphological deterioration of the common species Hypogymnia enteromorpha was documented." Transplants showed marked deterioration after a year's exposure in the San Bernardino Mountains.]

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