. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. 128 Elementary Botany or of the perisperm, or of both, persists, forming the so-called albumen, so that this latter may consist of endosperm, or of â perisperm, or of both. In the fertilisation of the Fir trees and their allies there is a modification of this process. In the first place the pollen A. Fig. â itiT.â Viola, tricolor. A, longitudinal section of anatropous ovule after fertilis
. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. 128 Elementary Botany or of the perisperm, or of both, persists, forming the so-called albumen, so that this latter may consist of endosperm, or of â perisperm, or of both. In the fertilisation of the Fir trees and their allies there is a modification of this process. In the first place the pollen A. Fig. â itiT.â Viola, tricolor. A, longitudinal section of anatropous ovule after fertilisa- tion : pi, placenta ; w, swelling on the raphe; router, /, inner integument; >, pollen- tube entering micropyle; e, embryo-sac, with the fertilised germinal vesicle at the micropyle end, and numerous endosperm cells at the other. _ B, apex of embryo-sac, e, with young embryo, eh^ of three cells, and one cell forming the suspensor or pro- embryo. C, same, further advanced. (After Sachs.) grains divide into two cells before pollination, and the tube, instead of being formed from the entire grain, is produced by one of the cells (fig. 249). In the next place the ovules, instead of being enclosed in an ovary, are naked (whence the plants are said to be gymnosperms, or naked-seeded plants, whilst other flowering plants are an- giosperms, or enclosed-seeded plants), so that the pollen falls direct upon the micropyle (fig. 250).. 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 Edmonds, Henry. London and New York : Longmans, Green, and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
