. Nature and development of plants. Botany. 292 DEVELOPMENT OF ANTHOCEROS scopic, closing over the spores in damp weather and opening in dry weather to expose them to the wind. These spores germi- nate and begin the life history of a new gametophyte. As in some of the Marchantiales a filamentous alga-like growth is first formed by the germinating spore before the characteristic plant is reproduced. 106. Order c. Anthocerotales or Horned Liverworts.—^This small group of four genera is the most interesting of any of the hepatics because it presents features that are suggestive of the algae and a
. Nature and development of plants. Botany. 292 DEVELOPMENT OF ANTHOCEROS scopic, closing over the spores in damp weather and opening in dry weather to expose them to the wind. These spores germi- nate and begin the life history of a new gametophyte. As in some of the Marchantiales a filamentous alga-like growth is first formed by the germinating spore before the characteristic plant is reproduced. 106. Order c. Anthocerotales or Horned Liverworts.—^This small group of four genera is the most interesting of any of the hepatics because it presents features that are suggestive of the algae and also of a relationship with the mosses. The thallus is of a primitive type, often with simple lobings and therefore, suggestive of relationship with the simpler Jungermaniales (Fig. 198). A peculiar feature of the order is the occurrence of mucil-. FiG. 198. One of the Anthocerotales, Antkoceros, bearing four pod-shaped sporophytes, s. The one on the right, s, has opened at the top and is dis- charging the spores, but elongation and the formation of spores continue below owing to its basal growth. age cavities which communicate with the air through small openings on the under side of the thallus. These cavities are always occupied by one of the blue-green algae, Nostoc, which possibly assists the plant in the retention of water owing to their mucilaginous character. Another interesting feature of the order is the occurrence usually of a single chloroplast in each cell, as in Coleochaete and several other genera of the algae. The archegonia and antheridia, while resembling those of the preceding orders,. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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