Abstract
Variation amongst wild populations of Scytosiphon lomentaria (Lyngbye) Link is shown to be of a continuous nature, and the species cannot be readily segregated into distinct subspecific taxa on the basis of morphological characteristics. Zoospores derived from plurilocular sporangia developed asexually into cylindrical thalli under long and short days at 16°C. The progeny of some cylindrical thalli included microthalli bearing plurilocular sporangia or unilocular sporangia. Cylindrical forms of S. lomentaria were obtained in culture from wild microthalli of two kinds, bearing either plurilocular or unilocular sporangia. The microthalli differ morphologically from the ralfsioid stages commonly known to be plethysmothalli and sporophytes of S. lomentaria, but closely resemble the microthalli derived from cultures of wild S. lomentaria.
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