. Plants; a text-book of botany. Botany. SPEKMATOPilYTES : ANGIOSI'EEMS 201. any organization of carpels which ap- pears as a single organ with one ovary .is a pistil. The ovules (megasporangia) are developed within the ovary (Fig. 170) either from the carpel wall, when they are foliar, or from the stem axis which ends within the ovary, when they are cauline (see § 89). They are similar in structure to those of Gymnosperms, with integument and micropyle, nu- cellus, and embryo-sac (megaspore), except that there are often two integu- ments, an outer and an inner (Fig. 171). 112. The male gameto
. Plants; a text-book of botany. Botany. SPEKMATOPilYTES : ANGIOSI'EEMS 201. any organization of carpels which ap- pears as a single organ with one ovary .is a pistil. The ovules (megasporangia) are developed within the ovary (Fig. 170) either from the carpel wall, when they are foliar, or from the stem axis which ends within the ovary, when they are cauline (see § 89). They are similar in structure to those of Gymnosperms, with integument and micropyle, nu- cellus, and embryo-sac (megaspore), except that there are often two integu- ments, an outer and an inner (Fig. 171). 112. The male gametophyte. — When the pollen-grain (microspore) germinates there is formed within it the sim- plest known gametophyte (Fig. 172). No trace of the Fig. 171. A diagrammatic section of an ovule of Angiosperme, sliowing outer integument (ai), inner integument {li), micropyle (m), nucellue (A), and embryo sac or megaspore (fm).—After 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and company
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