. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Fig. 4.—A, Archegonium of Riccia trichocarpa, showing the ventral canal cell (w), X525; B, ripe archegonium of R, glauca^ longitudinal section, X260. separates the ventral canal cell from the egg. The four primary cover cells enlarge a good deal as the archegonium approaches maturity, and divide by radial walls usually once, so that the complete number is normally eight—^Janczewski gives ten in R. BischoMi. The basal cell finally divides into a single lower cell which remains undivided, comple

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Fig. 4.—A, Archegonium of Riccia trichocarpa, showing the ventral canal cell (w), X525; B, ripe archegonium of R, glauca^ longitudinal section, X260. separates the ventral canal cell from the egg. The four primary cover cells enlarge a good deal as the archegonium approaches maturity, and divide by radial walls usually once, so that the complete number is normally eight—^Janczewski gives ten in R. BischoMi. The basal cell finally divides into a single lower cell which remains undivided, completely sunk in the thallus, and an upper cell which divides into a single layer of cells forming part of the venter, and continuous with the other peripheral cells. The mature archegonium (Fig. 4). 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;

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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910