Campbell Island: VOUCHER SPECIMEN: LE 221997. COLLECTION SITE: Stream 5.

DESCRIPTION: Thallus monocentric. Zoosporangia spherical, colourless, smooth-walled, 10-60 µm in diam., operculate, developing on the substrate in groups of 3-6. Operculum saucer-shaped, 5-8 µm in diam., apical or subapical. Rhizoids long, straight, richly branched, arising from the base of the zoosporangium. Zoospores oval, 3 x 5 µm, with a small colourless globule and flagellum, 18-20 µm long, discharging after the opening of the operculum and swarming in a vesicle. Resting spores spherical, 10-20 µm in diam, with a smooth colourless or light yellow wall and a large oil globule.

COMMENTS: This is a saprotroph that occurs only on chitin substrates in freshwater habitats. It has been reported from Europe, North and South America, and Africa.