. A text-book of botany for secondary schools. Botany. epidermis there are several layers of colorless cells; above these there is a series of large air-chambers into which project the curious cells containing the chloroplasts; and forming the dome-like roof of each air-chamber is the upper epidermis, pierced by a single air-pore in the center of the roof of each cham- ber. Each air-pore resembles a little chimney, built up with several tiers of cells. The rhombic areas seen on the surface of the body are the outlines of the air-chambers, and the minute open- ing in the center of each is the a
. A text-book of botany for secondary schools. Botany. epidermis there are several layers of colorless cells; above these there is a series of large air-chambers into which project the curious cells containing the chloroplasts; and forming the dome-like roof of each air-chamber is the upper epidermis, pierced by a single air-pore in the center of the roof of each cham- ber. Each air-pore resembles a little chimney, built up with several tiers of cells. The rhombic areas seen on the surface of the body are the outlines of the air-chambers, and the minute open- ing in the center of each is the air-pore r,G i<i2.~Marchanua: (Fig- 162). This arrangement of cells rhombic areas on up- Containing chloroplasts exposed in air- per surface of thallus in j i , â , ,. i (surface outline of air- Chambers that commumrate freely chambers), each one thr0U*''h pierced by an air- . '^ pore.âAfter Sachs. air-porcs suggests the same general mechan- ism for plant work as that g described for leaves, with their internal atmosphere and stomata (§13). A remarkable fact con- nected with the Marchantia body, as contrasted with that of the Thallophytes, is that it produces no spores. However, provi- sion for rapid multipHca- tion is made by the pro- duction of peculiar repro- ductive bodies that are developed in little cups on. Fig. 163.âMarchanHa: A , thallus bear- ing little cups containing reproduc- tive bodies, and an antheridial branch with its disk, as well as some very young antlieriiiial branches; B, section through antheridial disk, showing the sunken antheridia.âAfter 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
