oospores

Carpenter calls it, in distinction from the true sexual spores, which he terms "oospores."

Scientific American Supplement, No. 460, October 25, 1884 Various

_Vaucheria_ has, however, a second and far higher mode of reproduction, viz., by means of fertilized cells, the true oospores, which, lying dormant as resting spores during the winter, are endowed with new life by the rejuvenating influences of spring.

Scientific American Supplement, No. 460, October 25, 1884 Various

Pringsheim described the true sexual propagation by oospores, with such minuteness and accuracy that our knowledge of the plant can scarcely be said to have essentially increased since that time.

Scientific American Supplement, No. 460, October 25, 1884 Various

Plated oospores were incubated in the dark at 25°C for at least four days before being checked for germination.

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The elutant was centrifugated at 3000 rpm for 10 min to pellet the oospores. β-glucuronidase was added to the oospore and water suspension to a final concentration of 2000 U / ml.

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The initial inoculum is spread by oospores in plant debris, sporangia from nearby lettuce fields, inoculum in wild lettuce plants, and rarely by lettuce seed.

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Germinating oospores were observed using a stereo microscope

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Cultures were kept at 25°C in darkness for at least 20 d to produce mature oospores.

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This is the only known Saprolegnia which has excentric oospores.

Transactions of the American Philosophical Society 1771

The oogonia show, in their form, in the pitting of their walls, and in the structure and number of their oospores, near relations with the ferax group, but the species is at once recognizable by the peculiarities above men - tioned.

Transactions of the American Philosophical Society 1771