Six aero-aquatic species of Helicodendron Peyronel were isolated from
a variety of submerged decaying leaves and twigs of deciduous and coni
ferous plants collected from several ponds and streams in North Catalo
nia, Spain. These are H. articulatum Glen-Bott, H. conglomeratum Glen-
Bott, H. fractum P.J. Fisher, H. paradoxum Peyronel, N. tubulosum (Ble
ss) Linder, and H. westerdijkiae van Beverw. A brief description from
pure culture is provided for each species. All the reported species ar
e new to Spain.