Abstract
Tarichium auxiliare Kuhn was described from females of the beet cyst-nematode Heterodera schachtii Schmidt as a mycelial fungus and resting spores. The resting spores are shown to belong to a rhizomycelial fungus which forms them singly inside resting sporangia and also forms posteriorly uniflagellate zoospores inside zoosporangia. The resting spore part of Kuhn's fungus is transferred to the genus Catenaria, but his mycelial fungus can not be characterized. Aspects of the nature, biology, distribution and relationships of C. auxiliaris are discussed. The fungus is widespread in populations of H. schachtii and is also known in the cereal cyst-nematode Heterodera avenae.
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