. The structure and development of mosses and ferns (Archegoniatae). Fig. 4.—^A, Archegonium of Riccia trichocarpa, showing the ventral canal cell (f),XS25; B, ripe archegonium of R. glauca, longitudinal section, X260. separates the ventral canal cell from the ^gg. The fourprimary cover cells enlarge a good deal as the archegoniumapproaches maturity, and divide by radial walls usually once,so that the complete number is normally eight—Janczewskigives ten in R. BischoMi. The basal cell finally divides into asingle lower cell which remains undivided, completely sunk inthe thallus, and an upper c
. The structure and development of mosses and ferns (Archegoniatae). Fig. 4.—^A, Archegonium of Riccia trichocarpa, showing the ventral canal cell (f),XS25; B, ripe archegonium of R. glauca, longitudinal section, X260. separates the ventral canal cell from the ^gg. The fourprimary cover cells enlarge a good deal as the archegoniumapproaches maturity, and divide by radial walls usually once,so that the complete number is normally eight—Janczewskigives ten in R. BischoMi. The basal cell finally divides into asingle lower cell which remains undivided, completely sunk inthe thallus, and an upper cell which divides into a single layerof cells forming part of the venter, and continuous with theother peripheral cells. The mature archegonium (Fig. 4) n MUSCINE^—HEPATIC^—MARCHANTIALES 31 has the form of a long-necked flask with a much enlarged canal cells are completely indistinguishable, their wallshaving become absorbed and the contents run together into agranular mass. The nuclei of the neck-canal cells are smalland not readily recognisable
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
