A new species of Olpidium parasitic on cucumber roots

Abstract

Olpidium cucurbitacearum sp. n., from roots of Cucumis sativus L. var. Windermoor Wonder, is described. The fungus is distinguished from other Olpidium spp. by its zoospore and resting spore morphology and its restriction to cucurbitaceous hosts, and from species of Pleotrachelus Zopf by the typical occurrence of a single exit tube per sporangium.