Browsing Retrospective theses by Author "Pfeiffer, Helmut Nickolaus"
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Use of a single epiphyte lichen species Hypogymnia physodes as an indicator of air quality in northern Ontario
Pfeiffer, Helmut Nickolaus (1988)It has been determined that lichens are excellent indicators of regional air quality, since they are long-lived and totally dependent on atmospheric sources for nutrients. In the summer of 1987, samples of the ...