. Lectures on the evolution of plants. Botany; Plants. MOSSES AND LIVERWORTS 117 (Fig. 30, A, a) is composed mainly of a spongy green tissue which is also present in the upper part of the capsule, surrounding the large air-spaces between the sporogenous tissue and the outer part of the capsule. This green tissue recalls the " mesophyll " or spongy green tissue in the leaves of the higher plants, and like the mesophyll communicates with the outside atmos- phere by stomata. In a few cases, this basal part of the capsule (apophysis) is a very much enlarged spe- cialorgan, comparable phy
. Lectures on the evolution of plants. Botany; Plants. MOSSES AND LIVERWORTS 117 (Fig. 30, A, a) is composed mainly of a spongy green tissue which is also present in the upper part of the capsule, surrounding the large air-spaces between the sporogenous tissue and the outer part of the capsule. This green tissue recalls the " mesophyll " or spongy green tissue in the leaves of the higher plants, and like the mesophyll communicates with the outside atmos- phere by stomata. In a few cases, this basal part of the capsule (apophysis) is a very much enlarged spe- cialorgan, comparable physiologically, a 1 - though hardly struc- turally, with the leaves of higher plants. The . formation of spores is restricted to a very small part of the sporophyte, the sporogenous tissue comprising but a single layer of cells forming a cylinder in the middle region of the capsule, and surrounding the central col- umella (B, sp). The upper part of the capsule usually. 3C. Fio. 30 (Musci). — A, a longitudinal section through the upper part of the sporophyte of Funaria; a, the apophysis or en- larged basal part of the capsule, con- taining chlorophyll and with stomata in the epidermis; sp, the sporogenous tissue; o, the operculum, or lid, which finally falls away and allows the escape of the spores; r, the ring of cells where the lid 0 separates from the arn, or theca; B, cross-section of a young cap- sule, showing the position of the sporo- genous cells; C, a young stoma or breathing pore from the base of the capsule. The structure of the stoma is like that found upon the leaves of the higher 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 Campbell, Douglas Houghton, 1859-1953. New York, London, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade, booksubjectbotany, booksubjectplants
