Outlines of Botany for the High School Laboratory And Classroom: (Based On ...
Outlines of Botany for the High School Laboratory And Classroom: (Based On ...
Robert Greenleaf Leavitt
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The result is the division of the egg and the for- mation of an embryonic Fern plant (Fig. 351), in which the beginnings of leaf, stem, and root can soon be made out. Commonly only one of the several archegonia which may be fertilized gives rise to a per- fected Fern plant. After the establish- ment of the latter, the prothallium dies. 483. The entire life history of tlie Fern thus comprises two stages, that of the prothallium (bearing archegonia and antheridia), and that of the leafy, 351. pro...thallium with spore-bearing plant. It will be recalled yo^'^s ^P^^^f •^ ^ ^ bearing plant. that in some of the lowest Algae (e.g. Vaucheria) the same individual plant gives rise to spores Digitized by VjOOQIC CRYPTOGAMS 207 (zoospores) germinating without fusion, and gametes destined to conjugate. In Ferns it is plainly seen that the two sorts of reproductive cells (spores and gametes) are not borne at the same period, but at very dif- ferent stages of the life cycle. The two stages regularly alternate.
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