Campbell Island: VOUCHER SPECIMEN: LE 221995. COLLECTION SITE: Stream 5.

DESCRIPTION: Thallus polycentric, intramatrical. Zoosporangia terminal or intercalary, without an apophysis, formed from the swellings of the rhizomycelium, spherical or citriform, 8-30 µm in diam., with small papillae or a rather thick discharge tube. Rhizomycelium consisting of intensive, branched, tenuous filaments that bear intercalary spindle organs 10-17 µm in diam. and with one or two septae. Zoospores spherical, 4.5-5.5 µm in diam. with colourless oil globule and flagellum 25- 28 µm long, emerging to form a globular mass at the exit orifice and after remaining quiescent for a while, then separating and swimming away. Resting spores spherical, 8-16 µm in diam., oval, broadly spindleshaped with a colourless smooth wall and one largecolourless oil globule.

COMMENTS: This species is a saprotroph of various types of dead plant material in water. It is widely distributed and has been recorded from freshwater habitats in Europe, North America, South America, and Africa.