. The British Charophyta. Characeae. 44 BRITISH CHAROPHYTA. In Lychnothamnus and Nitellopsis the arrangement is apparently similar. In Lychnothamnus the oogonium, which is solitary, is produced separately from the central peripheral cell on the inner side of the branchlet, that is the side facing the stem or branch, and antheridia are normally produced from peripheral cells on either side of that producing the oogonium (Fig. 16 iii A and B). In Nitellopsis the only known. Pig. 16.—Position of reproductive organs in several genera. <J = antheridium, ? = oogonium in all figvires. i. Nitella f
. The British Charophyta. Characeae. 44 BRITISH CHAROPHYTA. In Lychnothamnus and Nitellopsis the arrangement is apparently similar. In Lychnothamnus the oogonium, which is solitary, is produced separately from the central peripheral cell on the inner side of the branchlet, that is the side facing the stem or branch, and antheridia are normally produced from peripheral cells on either side of that producing the oogonium (Fig. 16 iii A and B). In Nitellopsis the only known. Pig. 16.—Position of reproductive organs in several genera. <J = antheridium, ? = oogonium in all figvires. i. Nitella flexilis (after Sachs): pr, apex of primary ray; sr, bases of two secondary rays. ii. Tolypella glomerata (after Migula): pr^ primary ray; sr, secondary lateral rays; tr, terminal ray. iii. Lychnothamnus barbatus (after Braun): A. Side view. b. Transverse section of branchlet-node (schematic)—n, central cell of node; he, bract-ceUs. iv. Lamprothamnium papulosum (after Braun): A. Vertical section of branchlet-node. b. Transverse ditto—n, central cell of node; pc, peripheral cells of node; be, bract-cells; i, intemodal cells of branchlet J a, antheridium. species is dioecious so that the relative position of the two organs cannot be ascertained, but their origin appears to be similar to that in Lychnothamnus. In Lamprothamnium and Chara, which in the position of their reproductive organs are somewhat 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 Groves, James; Bullock-Webster, George Russell, 1858- joint author. London, The Ray society
Size: 1930px × 1295px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1920
