The structure & development of the mosses and ferns (Archegoniatae) . cut out by two, XII LEPTOSPORANGIATA£ HETEROSPOREyE 405 and not three, walls. The basal cell of the aichegoniuni inMarsilia divides by cross-walls into equal quadrants, and thelateral cells divide both by vertical and horizontal walls beforeany further divisions take place in the archegonium. Thisfinally divides into the cover cell and inner cell. The neck isvery short, especially in Marsilia, and each row has but twocells. These in Pilulaiia {¥\g. 211) are much longer. Bothneck and ventral canal cells are very small, espcci
The structure & development of the mosses and ferns (Archegoniatae) . cut out by two, XII LEPTOSPORANGIATA£ HETEROSPOREyE 405 and not three, walls. The basal cell of the aichegoniuni inMarsilia divides by cross-walls into equal quadrants, and thelateral cells divide both by vertical and horizontal walls beforeany further divisions take place in the archegonium. Thisfinally divides into the cover cell and inner cell. The neck isvery short, especially in Marsilia, and each row has but twocells. These in Pilulaiia {¥\g. 211) are much longer. Bothneck and ventral canal cells are very small, espcciall) inMarsilia, and the former hasits nucleus undivided. In Mar-silia the prothallium growsgradually as the divisions pro-ceed, but in Pilularia (Fig. 211)the young prothallium increasesbut little in size until the divi-sions are almost completed, whenthere is a sudden complete development ofthe prothallium occupies abouttwelve to fifteen hours in Mar-silia vestita, and in Pilulariaglobiilifera forty to forty-fivehours. The escr in both eenera is.
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
