Observations on the Fine Structure of the Zoospore ofOedogonium cardiacumwith Special Reference to the Flagellar Apparatus

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Abstract
Parts of the flagellar apparatus both inside and outside the cell have been investigated in a preliminary way by sections and whole mounts. Zoospores from male plants of O. cardiacum possess about 120 flagella, the bases of which are held together in a ring by means of a characteristically patterned fibrous band and some differently arranged more homogeneous material. Between each pair of bases a compound root passes backwards into the cell. Each root has two radially superposed components: the outer component consists of three fibres starting at the fibrous ring and passing backwards close to the cell surface; the inner component is shorter and stouter, extending backwards for an uncertain distance but penetrating forward below the fibrous ring, to end within the substance of the colourless apical dome of the cell. The material of the inner component of a root displays a regular crossbanding of alternate thin and thicker lines spaced at approximately 140A for each unit of pattern (i.e. two lines). The orientation of the free parts of the flagella with respect to the fibrous ring is such that their two central strands when seen in cross-section near the base are obliquely vertical.

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