. Botany, an elementary text for schools. Botany. on the firm soil of undisturbed pots and beds. Or spores may be sown in a damp, warm place. 321. On the under side of the prothallus two kinds of organs are borne. These are the archegonium and the antheridium. These organs are mi- nute specialized parts of the prothallus. Their positions on a particular prothal- .,.„ ^, lus are shown at a and h in Fig. 312, M8. The brake fruits . & i underneath the revo- but m somc fcms they are on separate lute edges of the leaf. prothalU (plant dloicious). TJte sj)en>i- cells escape from the antlierid
. Botany, an elementary text for schools. Botany. on the firm soil of undisturbed pots and beds. Or spores may be sown in a damp, warm place. 321. On the under side of the prothallus two kinds of organs are borne. These are the archegonium and the antheridium. These organs are mi- nute specialized parts of the prothallus. Their positions on a particular prothal- .,.„ ^, lus are shown at a and h in Fig. 312, M8. The brake fruits . & i underneath the revo- but m somc fcms they are on separate lute edges of the leaf. prothalU (plant dloicious). TJte sj)en>i- cells escape from the antlieridmm and in the water which collects on the lyrothallus are carried to the archegonium, where fertilization takes place. From a fertilized arche- gonium a plant grows, and this plant becomes the "; In most cases the prothallus dies soon after the fern plant begins to grow. 322. The fern plant, arising from the fertilized egg in the archegonium, becomes a perennial plant, each year producing spores from its fronds, as we have seen; but these spores—which are merely detached special kinds of cells—produce the prothallic phase of the fern plant, from which new individuals arise. A fern is fer- tilized hut once in its lifetime. This alterna- tion of phases is called the alternation of gen- erations. The first or fertilized plant is the gametophyte; the sec- ond or UOn - fertilized ^'^^' ^*flexed margins of a maidenhair frond. plant is the sporophyte {phijton is Greek for "plant"). 323. The alternation of generations runs all through the vegetable kingdom, although there are some groups of plants in which it is very obscure or apparently want-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York Macmillan
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