Although the number of algicolous fungi is small, they are of particular interest because of their parasitic or symbiotic properties. Only 79 species of filamentous fungi—out of a total of 465 marine species—are associated with marine algae, and 18 with animals; many of them have not been illustrated in detail. The present paper provides illustrations and full descriptions of 8 marine ascomycetes, 6 of them from algae and 2 from animal hosts. The algicolous species belong to the genera Didymella, Haloguignardia, Spathulospora and Turgidosculum; those from animals are members of Abyssomyces and Laboulbenia. The illustrations are line drawings made with the aid of a camera lucida, and are almost all based on type material.
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