. Botany for agricultural students. Plants. THE MARCHANTIAS 407 divided into three orders — Marchantiales, Jungermaniales, and Anthocerotales. The Marchantias. — The Marchantiales include the best known Liverworts, among which are the Marchantias, the most highly specialized Liverworts of this order and the family after which the order is named. The Marchantia common in the north temperate regions is Marchantia polijmorpha. It grows in moist places, often occm-ring abundantly in swampy regions, on shaded river banks, and on protected rocky ledges. It often gets started. Fig. 363. — A female an
. Botany for agricultural students. Plants. THE MARCHANTIAS 407 divided into three orders — Marchantiales, Jungermaniales, and Anthocerotales. The Marchantias. — The Marchantiales include the best known Liverworts, among which are the Marchantias, the most highly specialized Liverworts of this order and the family after which the order is named. The Marchantia common in the north temperate regions is Marchantia polijmorpha. It grows in moist places, often occm-ring abundantly in swampy regions, on shaded river banks, and on protected rocky ledges. It often gets started. Fig. 363. — A female and a male plant of Marchantia polymorphia, show- ing the external features of the plant body (about natural size). The two plants, of which A is the female and B the male plant, differ most noticeably in the character of the gametophores which are the erect stalks with expanded tops (conceptacles) on which the sex organs occur, r, rhizoids; c, the gemmae cups which are concerned with vegetative multiplication. in greenhouses where it develops and spreads rapidly on moist soil that is left undisturbed. Being easily obtained, it is one of the Liverworts most commonl}'^ studied in botanical laboratorieSo The plant body is shown in Figure 363. The flat, lobed, green plant body or thallus lies prostrate on the substratum. Often the plants are so much crowded as to overlap, and form aggrega- tions that cover the substratum like a carpet. Single plants are often several inches in length and breadth, and consist of a number of layers of cells in thickness. On the. 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 Martin, John N. (John Nathan), b. 1875. New York, John Wiley ; London, Chapman & Hall
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
