. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 289 (Fig. 196). In other genera there are indications of a lobing in the thallus which becomes more pronounced in some forms and leads by gradual gradations to genera in which the lobes appear as distinct leafy organs arranged in two rows upon a stem-like. Fig. 197. One of the leafy Jungermaniales, Porella: A, branch of the plant bearing several sporophytes. B, under surface of a branch, showing the lobing of the leaves and a row of minute scale-like leaves. C, portion of a branch bearing an archegonium surrounded by cup-like pe
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 289 (Fig. 196). In other genera there are indications of a lobing in the thallus which becomes more pronounced in some forms and leads by gradual gradations to genera in which the lobes appear as distinct leafy organs arranged in two rows upon a stem-like. Fig. 197. One of the leafy Jungermaniales, Porella: A, branch of the plant bearing several sporophytes. B, under surface of a branch, showing the lobing of the leaves and a row of minute scale-like leaves. C, portion of a branch bearing an archegonium surrounded by cup-like perianth with minute involucrate leaves at base. D, branch with cone-like antheridial branchlets. At the left a single leaf is shown with globular antheridium in its axis. E, section of a branch similar to C. The archegonium is seen surrounded by the perianth and below the involucrate leaves. The sporo- phyte is nearly mature and ready to elongate. It consists of a round cap- sule containing elaters and spore mother cells that are dividing to form four spores each. Below the capsule is the stalk or seta which ends in a foot buried in the tissues of the branch. At the right is an unfertilized arche- gonium that shows the original position and size of this organ.—H. O. Hanson. 19. 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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