. The structure and development of mosses and ferns (Archegoniatae). S. ^- Fig. 112.—Longitudinal section of a fully-developed sporogonium of Funaria hygro-metrica, X about 40; s, seta: a, apophysis; sp, spores; col, columella; r, annulus;o, operculum. the outside of the capsule to the base of the peristome, and formthe rim of the theca or urn. The epidermis of the whole capsule has its outer walls verymuch thickened, and upon the apophysis are found stomataquite similar to those found upon the sporogonium of Antho-ceros or upon the leaves of vascular plants. Haberlandt ( (4),p. 464), showed t
. The structure and development of mosses and ferns (Archegoniatae). S. ^- Fig. 112.—Longitudinal section of a fully-developed sporogonium of Funaria hygro-metrica, X about 40; s, seta: a, apophysis; sp, spores; col, columella; r, annulus;o, operculum. the outside of the capsule to the base of the peristome, and formthe rim of the theca or urn. The epidermis of the whole capsule has its outer walls verymuch thickened, and upon the apophysis are found stomataquite similar to those found upon the sporogonium of Antho-ceros or upon the leaves of vascular plants. Haberlandt ( (4),p. 464), showed that while the form of the fully-developedstoma in Funaria differs from that of most vascular plants,this difference is secondary, and that in its earlier stages nodifference exists. This can be easily verified, and with littledifficulty all the different stages found. The young stoma(Fig. 113), has the division wall extending its whole length. 212 MOSSES AND FERNS CHAP. as is the case in stomata of the ordinary form. As the stoma. Fig. 113.—~Funaria hygrometrica. A, Young; B, older stoma, from the base of the capsule; C, vertical section, X360. grows larger, however, the median wall does not grow as fastas the lateral walls, and a space is left between its extremities, B, A.
Size: 2202px × 1135px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
