. The structure and development of mosses and ferns (Archegoniatae). Fig. gg.—Amblystegium riparium, var. fiuitans. A, Longitudinal section of the stempassing through a young lateral branch {k) ; h, hair at the base of the subtendingleaf; B, horizontal sec+^^ion of a very young leaf, showing the apical cell (,x) ; C,D, transverse sections of young leaves, showing the development of the the figures X525. on the outer side being larger than the others. In the formerthe next wall is a periclinal one and divides the cell into an innerand an outer one. From the two inner cells by further
. The structure and development of mosses and ferns (Archegoniatae). Fig. gg.—Amblystegium riparium, var. fiuitans. A, Longitudinal section of the stempassing through a young lateral branch {k) ; h, hair at the base of the subtendingleaf; B, horizontal sec+^^ion of a very young leaf, showing the apical cell (,x) ; C,D, transverse sections of young leaves, showing the development of the the figures X525. on the outer side being larger than the others. In the formerthe next wall is a periclinal one and divides the cell into an innerand an outer one. From the two inner cells by further divisionis formed the group of small conducting cells that traverse thecentre of the midrib, while the outside cells together with thoseon the inner side of the midrib become much thickened andserve for strengthening the leaf. As in Amblystegium thelamina of the leaf remains single-layered, and its cells containnumerous large chloroplasts which, as is well-known, continue VI. THE BR VALES 193 to multiply by division after the cells are fully f^rown. Themarginal
Size: 1278px × 1956px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
