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A New Species of Dictyostelium from Hawaii

Nancy Nelson, L. S. Olive and Carmen Stoianovitch
American Journal of Botany
Vol. 54, No. 3 (Mar., 1967), pp. 354-358
Stable URL: http://www.jstor.org/stable/2440763
Page Count: 5
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A New Species of Dictyostelium from Hawaii
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Abstract

A new species of Dictyostelium, isolated from a decaying ear of corn in Hawaii, is described. Because of the numerous irregularities in its developmental morphology and general appearance, it is being named D irregularis. Aggregation is by amoebal streaming, and the aggregation mass commonly segments into several pseudoplasmodia, each of which produces a sorocarp in situ or after migration. During migration stalk material is laid down behind the pseudoplasmodium. The mature sorocarps, which do not exceed 1 mm in height, have very irregular stalks and globular-to-elongate sori with elliptical spores that measure 3.5-7 x 4.8-9.8 μ. Cyst formation was not observed. The new species is of particular interest from the standpoint of its probable primitive position in the genus.

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