Sumario: | This is the first contribution to the knowledge of the lignicolous marine fungi from Mar del Plata, Argentina. Ten species were collected from submerged wood panels, intertidal wood and driftwood. Seven species of Ascomycotina are described: Ceriosporopsis caduca E.B.G. Jones & Zainal, C. halima Linder, Halosphaeria appendiculata Linder, Lulworthia medusa (Ellis & Everh.) Cribb & Cribb. f. halima Hughes, Marinospora calyptrata (Kohlm.) A. R. Caval., Remispora quadriremis (Höhnk) Kohlm. and R. stellata Kohlm. and three species of Deuteromycotina: Cirrenalia macrocephala (Kohlm.) Meyers & R.T. Moore, Zalerion maritimum (Linder) Anastasiou and Z. varium Anastasiou. Six are new records for Argentina and three of them are new records for South America.
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