Melanopsichium austro-americanum (Speg.) Beck on Polygonum
Sori as conspicuous galls in various parts of host plants in the Polygonaceae, composed of hypertrophied host tissue and mycelia, with numerous chambers filled with a great number of solitary spores embedded in a gelatinous mass.
Spore germination of Ustilago-type.
Host-parasite interaction by intracellular hyphae coated by an electron-opaque matrix.
Septa poreless at maturity.
Melanopsichium contains two species, one of which occurs in Australia.