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Dictyostelium aureo-stipes and Dictyostelium tenue: New Species of the Dictyosteliaceae

James C. Cavender, Kenneth B. Raper and Ann M. Norberg
American Journal of Botany
Vol. 66, No. 2 (Feb., 1979), pp. 207-217
Stable URL: http://www.jstor.org/stable/2442526
Page Count: 11
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Dictyostelium aureo-stipes and Dictyostelium tenue: New Species of the Dictyosteliaceae
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Abstract

Three new cellular slime molds, Dictyostelium aureo-stipes sp n., D. aureo-stipes var helvetium var n. and D tenue sp. n, are described which possess characteristics heretofore unrecorded in the Dictyosteliaceae The two species are unlike in dimensions and complexity of form, yet show a number of features in common, and may in fact be closely related D. aureo-stipes var helvetium is relatively large and robust, forming multiple-branched fruiting bodies without the regularity of form found in Polysphondylium, yet tending toward symmetry when well-developed. The golden-yellow stipe is a distinguishing feature of D. aureo-stipes and is even more pronounced in var. helvetium. D. tenue is smaller and simpler in form The degree of branching is much reduced, and oftentimes a solitary sorus terminates a delicate stipe composed of a single tier of cells. Both species are quite sensitive to environmental conditions, particularly temperature, for optimum development occurs within relatively narrow ranges.

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