. Practical botany. Botany. 268 PEACTICAL BOTANY is atmospheric contact with the internal chlorophyll region. The lower layers of tissue bear less chlorophyll, but they com- pose the main supporting part of the plant. From these the rhizoids descend. In vegetative structure Marchantia is more complex than Ricda, or perhaps than mosses, and very much more complex than any of the green Fig. 223. A common liverwort {Marchaviia) The plant shown at the left is an archegonial or female plant: rh, rhizoids; c, cupulas, in which are buds or gemmse; .<, stalk of the archegonial branch; )•, r
. Practical botany. Botany. 268 PEACTICAL BOTANY is atmospheric contact with the internal chlorophyll region. The lower layers of tissue bear less chlorophyll, but they com- pose the main supporting part of the plant. From these the rhizoids descend. In vegetative structure Marchantia is more complex than Ricda, or perhaps than mosses, and very much more complex than any of the green Fig. 223. A common liverwort {Marchaviia) The plant shown at the left is an archegonial or female plant: rh, rhizoids; c, cupulas, in which are buds or gemmse; .<, stalk of the archegonial branch; )•, radiating, finger-like projections of the head; a, region in which the archegonia are borne. At the right is an antheridial plant: a, antheridial head. Both plants show the leaf- like expansion (Z) and the midrib (m). About one and one-half times natural size 250. Marchantia: vegetative reproduction. Upon the upper surface of Marchantia in the midrib region there are frequently developed cup-like outgrowths (cupules), within which many buds (^gemmoti) are formed (Fig. 223, c). The gemmae grow upon small stalks from the bottom of the cupules. In a given cupule there may be gemmse ranging in size and age from those that consist of one or a few cells to those with dozens. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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