|Title||Observations on chytridiaceous parasites of phanerogams. VII. A Physoderma on Lycopus americanus|
|Publication Type||Journal Article|
|Year of Publication||1957|
|Journal||American Journal of Botany|
A species of Physoderma which causes pronounced hypertrophy has been found on Lycopus americanus in northern Michigan. It is characterized primarily by having epibiotic sporangia of two types, one producing colorless zoospores, the other zoospores with orange-colored globules. The fungus on the basis of field observations and preliminary cross-inoculation experiments is seemingly confined to Lycopus americanus.