. The structure and development of mosses and ferns (Archegoniatae). egonia are borne upon similar but shorterbranches and their development also is very regular. In Fig. 40,B, a vertical section through the end of a young female branchis shown with the apical cell {x). Segments are here, too, cut Ill THE JUNGERMANNIALES 93 off alternately right and left, and from each segment an arche-gonium develops. The segment is first divided, probahly, asin the male branch and the vegetative ones, into an inner andan outer cell, but I did not succeed in getting satisfactory longi-tudinal sections paralle
. The structure and development of mosses and ferns (Archegoniatae). egonia are borne upon similar but shorterbranches and their development also is very regular. In Fig. 40,B, a vertical section through the end of a young female branchis shown with the apical cell {x). Segments are here, too, cut Ill THE JUNGERMANNIALES 93 off alternately right and left, and from each segment an arche-gonium develops. The segment is first divided, probahly, asin the male branch and the vegetative ones, into an inner andan outer cell, but I did not succeed in getting satisfactory longi-tudinal sections parallel to the surface, so cannot speak posi-tively on this point. The youngest segment, in which thearchegonium mother cell is recognisable, shows in vertical sec-tion three cells, a small ventral one, a middle larger one, anrla dorsal one—the archegonium mother cell. The latter doesnot form any stalk, but divides at once by the three intersect-ing walls, as in other Hepatic?e, and the further developmentcorresponds with these, except that the base of the archegonium. B.
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
