. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 152 MOSSES AND FERNS CHAP. stages at least, a similar columella will be found. The single embryo that Leitgeb (1. c. PL IV., Fig. yy) figures of N. orbi- cularis (valvata) is at once seen to be abnormal, and as his con- clusions were drawn from a study of similar dead embryos in the other species, they cannot be accepted without more satis- factory evidence. While in the main corresponding to the em- bryo of Anthoceros there are some interesting differences which are closely associated with th
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 152 MOSSES AND FERNS CHAP. stages at least, a similar columella will be found. The single embryo that Leitgeb (1. c. PL IV., Fig. yy) figures of N. orbi- cularis (valvata) is at once seen to be abnormal, and as his con- clusions were drawn from a study of similar dead embryos in the other species, they cannot be accepted without more satis- factory evidence. While in the main corresponding to the em- bryo of Anthoceros there are some interesting differences which are closely associated with the structure of the older sporogo- nium. The foot is smaller than in Anthoceros and derived only from the lowest tier of cells. The columella is decidely smaller, and the archesporium, as well as the young sporogonium wall, relatively much thicker. As in Anthoceros, the archesporium does not extend to the foot, but is separated by the zone of 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, The Macmillan Company;
Size: 1348px × 1854px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
