Ancient Plants, Being a Simple Account of the Vast Vegetation of the Earth And of the Recent Important Discoveries Made in This Realm of Nature Study
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Some fossils have such sporangia with eight spores, or some other small number; living Selaginellas have four. In the same cone sporangia with small spores are developed and give rise to the male •organs.
sporangvu/niy lualX apOTothy fig- S4- — " Spores " of Seedlike Structure Out of a tetrad in each sporangium only one spore iripens, s in figure, the others, s, abort. The wall of the sporangium, w, is more massive than in the pre- ■ceding cases, and from the sporophyll, flaps, spf, grow up on ...each side and enclose and protect the sporangium. The one big spore appears to germi- nate inside these protective coats, and not to be scat- tered separately from them. Only found in fossils, one of the methods of reproduction in Lepidodendron.
■Other sporangia with small spores were developed "which gave rise to the male organs.
76 ANCIENT PLANTS Fig- 55-— "Seed" In appearance this is lilie a seed, but differs from a true seed in having no embryo, and is lilte the preceding structure in having a very large spore, s, though there is no trace of the three aborting ones.
What to read after Ancient Plants, Being a Simple Account of the Vast Vegetation of the Earth And of the Recent Important Discoveries Made in This Realm of Nature Study?
You can find similar books in the "Read Also" column, or choose other free books by Stopes, Marie Carmichael, 1880-1958 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Some fossils have such sporangia with eight spores, or some other small number; living Selaginellas have four. In the same cone sporangia with small spores are developed and give rise to the male •organs.
sporangvu/niy lualX apOTothy fig- S4- — " Spores " of Seedlike Structure Out of a tetrad in each sporangium only one spore iripens, s in figure, the others, s, abort. The wall of the sporangium, w, is more massive than in the pre- ■ceding cases, and from the sporophyll, flaps, spf, grow up on ...each side and enclose and protect the sporangium. The one big spore appears to germi- nate inside these protective coats, and not to be scat- tered separately from them. Only found in fossils, one of the methods of reproduction in Lepidodendron.
■Other sporangia with small spores were developed "which gave rise to the male organs.
76 ANCIENT PLANTS Fig- 55-— "Seed" In appearance this is lilie a seed, but differs from a true seed in having no embryo, and is lilte the preceding structure in having a very large spore, s, though there is no trace of the three aborting ones.
What to read after Ancient Plants, Being a Simple Account of the Vast Vegetation of the Earth And of the Recent Important Discoveries Made in This Realm of Nature Study?
You can find similar books in the "Read Also" column, or choose other free books by Stopes, Marie Carmichael, 1880-1958 to read onlineMoreLess
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