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The Acrasieae in Nature. III. Occurrence and Distribution in Forests of Eastern North America

James C. Cavender and Kenneth B. Raper
American Journal of Botany
Vol. 52, No. 3 (Mar., 1965), pp. 302-308
Stable URL: http://www.jstor.org/stable/2439945
Page Count: 7
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The Acrasieae in Nature. III. Occurrence and Distribution in Forests of Eastern North America
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Abstract

The distribution of 9 members of the Acrasieae in the climax associations of the temperate deciduous forest of Eastern North America was determined. No undescribed species were isolated. The presence, density, relative density, and frequency of species were found to fluctuate with the environment as indicated by the dominant trees in the forest canopy. The acrasian population of the lowland hardwood forest (silver maple-American elm) differs markedly in relative density and frequency of its constituent species from that of any upland forest. High frequencies of Polysphondylium pallidum and Dictyostelium polycephalum characterize this forest type. In the upland forest, D. minutum is the most characteristic species and maintains a high frequency and relative density over most of the forest area; however, it decreases in importance in southern regions. The relatively dry oak-hickory association was found most favorable for the development of the Acrasieae. Soils of the boreal forest contain only limited numbers of Acrasieae representing few species.

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