A New Olpidiopsis Parasite of Karlingia rosea from Maryland

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Abstract
O. karlingiae, an endobiotic parasite of the sporangia of the chytrid K. rosea, developed in a culture of this host which had been isolated on bits of onion skin from a soil and water sample near Frederick, Md., 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. It appears to be an obligate parasite of K. rosea, since all attempts to infect 11 other chytrids have failed. 7 other related simple holocarpic biflagellate Phycomycetes were isolated from water and soil in various parts of Md.