oospheres

In many cases the differentiation of the sexual cells does not proceed so far as the formation of antherozoids or of distinct oospheres; these cases I shall investigate with the others in detail presently.

Scientific American Supplement, No. 531, March 6, 1886 Various

The macrospore or embryo-sac produces a prothallium called the endosperm, in which archegonia or corpuscula are formed; and lastly, in typical dicotyledons it is only lately that any trace of a prothallium from the microspore or pollen cell has been discovered, while the macrospore or embryo-sac produces only two or three prothallium cells, known as antipodal cells, and two or three oospheres, known as germinal vesicles.

Scientific American Supplement, No. 531, March 6, 1886 Various

From the time of the appearance of the wall these bodies are no longer oospheres, but oospores.

Transactions of the American Philosophical Society 1771

The num - ber of these nuclei bears no relation to the number of oospheres to be formed, except as both are controlled by the amount of protoplasm in the oogonium.

Transactions of the American Philosophical Society 1771

Hartog ( '92) states that in Saproleg - nia the reduction of the number of nuclei to that of the future oospheres is completed as early as the beginning of the foimation of the ongins, while in Acklya it may be delayed until the young oospore.

Transactions of the American Philosophical Society 1771

Just when and how they regain the vegetative structure, I am not yet able to say, having unfortunately failed to obtain sections of oogonia at the stage of the formation of the oosphere origins and of the rounding off of the oospheres.

Transactions of the American Philosophical Society 1771

Pringsheim ( '82) opposed these views very strongly with argu - ments and with an account of observations of the penetration of the oospheres by amoeboid swarmers — "spermamoebae" — developed in the fertilization tubes and set free from them.

Transactions of the American Philosophical Society 1771

( '72) assumed and argued for the necessity of fertilization, and maintained the ina - bility of unfertilized oospheres to form ripe oospores.

Transactions of the American Philosophical Society 1771

"With liberal allowance for the presence of parts of the same nucleus in two sections, it is not probable that the oogonium contained less than 100 nuclei; yet this species rarely produces more than five oospheres in an oogonium.

Transactions of the American Philosophical Society 1771