Dictyosporium triramosum sp. nov, is described from fallen, decaying herbac
eous stem, floating in polluted water from Santiago river (Bs. As. Province
, Argentina). It is sporodochial and characterized by conidia consisting of
three parallel rows, tightly appresed arranged in three planes. Dictyospor
ium triramosum is compared with other Dictyosporium species of similar coni
dial morphology.