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This illustration shows the structure of the thallus of Ricciocarpus: A, section of the thallus, showing the apical cell, x, forming cells that by further division develop into plates of cells separated by air spaces, j. At the left the plates thus formed are seen curving over the apical cell. B, an olderp ortion of the upper part of the thallus. The air spaces, j, are greatly enlarged and the upper cells of the vertical plates have divided, arching over the air spaces but leaving small openings which permit the entrance of air for photosynthesis.

Ricciocarpus

This illustration shows the structure of the thallus of Ricciocarpus: A, section of the thallus, showing…

This illustration shows a diagram of the life history of Ricciocarpus. The upper portion of the figure represents the sexual generation and the lower portion, the asexual. The former generation begins with the formation of the spores, sp, from the mother-cell and ends with the formation of the gametes, g. The asexual generation begins with the gametospore, gm, and ends with the spore mother cells, sm.

Ricciocarpus

This illustration shows a diagram of the life history of Ricciocarpus. The upper portion of the figure…