The flagellar apparatus of the quadriflagellate zoospores of the marine cladophoralean alga, Chaetomorpha spiralis Okamura, was compared with that of other green algae. There is a general similarity, with some important differences, to the Ulvales and siphonous green algae so far studied. Common features are the presence of a cruciate root System (4-2-4-2 type), basal body overlap, the presence of terminal caps and displacement of the upper pair of the basal bodies and four microtubular roots. On the basis of these features, it is concluded that the taxonomic affinities of C. spiralis lie with the Ulvophyceae sensu Stewart and Mattox rather than with the Chlorophyceae sensu Stewart and Mattox.In this alga two pairs of basal bodies He at obviously different levels. Basal bodies of the upper pair are disposed relevant to each other in the 11/5 o'clock direction (counter-clockwise orientation), whereas basal bodies of the Iower pair are in the 1/7 o'clock direction (clockwise orientation). We discuss the terminology of the arrangements of the flagellar apparatus components.Characteristics of the striped fibres which connect the X-membered roots to basal bodies are also discussed and this is given the name "X-membered root associated striped band (XSB)" to distinguish it from the rhizoplast-type System II fibres.

Apsilops japonicus n. sp. is described from Japan. This species parasitizes an aquatic crambid moth, Neoschoenobia testacealis Hampson, a petiole borer of the yellow water lily, Nuphar subintegerrimum (Casp.) Makino sensu lato. A key to the world species of Apsilops is provided.

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