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SUMMARY
Olpidiopsis Karlingiae is an endobiotic parasite of the sporangia of the chytrid Karlingia rosea. It developed in a culture of this host which had been isolated on bits of onion skin from a soil and water sample near Frederick, Maryland in April, 1948. It is characterized by a monocentric holocarpic thallus, spherical, oval, pyriform or oblong sporangia, with a broad, short or long discharge tube, reniform, biflagellate, heterocont zoospores, and asexual, spherical, oval, oblong or angular resting spores. So far it appears to be an obligate parasite of K. rosea since all attempts to infect eleven other chytrids have failed.
In addition to this species seven other related simple holocarpic biflagellate Phycomycetes were isolated from water and soil in various parts of Maryland.