A Virus Infection in the Brown Alga Sorocarpus uvaeformis (Lyngbye) Pringsheim (Phaeophyta, Ectocarpales)*

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Abstract
Virus-like particles were obsemed in zoospores and less frequently in vegetative cells of the filaments of mature plants of the brown alga Sorocarpus uvaeformls. The particles, measuring approximately 170 nm in diameter, are isometric in profile and show three distinct zones. An electron dense rim (coat), 10 nm in thickness, is separated from a dense core, 110 nm in diameter, by an electron light space 20 nm in width. When closely packed the particles are usually separated from each other by a regular halo-like space. Besides the isometric particles long flexuous structures of variable length and measuring 75 nm in width were also found. The infection could be induced experimentally in healthy cells by using either medium prevenient from infected cultures or crude extracts obtained from infected plants.

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