Cytological Study of Stigonema mammilosum

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Abstract
Cells of Stigonema act independently, although aggregated into a filament which is often many cells in diam. When a cell is rejuvenated at the surface of the filament it produces a true branch; when the rejuvenating cell is more deeply placed it produces a group of vigorous cells, which, being surrounded by comparatively inactive cells, gives the filament a spotted appearance, which suggested the generic name. The central body is a primitive nucleus which has no nuclear membrane or nucleolus, and no spindle during division.

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