262 



PLANT LIFE. 



A' 



A 

 FIG. 291. FIG. 292. 



FIG. 291. Six stages in the development of a brood bud of Marchantia ; all seen from 

 side. I, very young, the originally single cell projecting from bottom of cup (fig. 290) 

 divided into a stalk ceil and terminal cell. II, older, terminal cell divided trans- 

 versely. Ill, IV, V, successively older stages. VI, mature, cells not shown; two 

 growing points localized on right and left edges. I-V, magnified about 250 diam.; 

 VI, about 25 diam. After Sachs. 



FIG. 292. Brood buds of mosses. A, upper part of the stem of A ulaconininiu andro- 

 gynuin, with a cluster of brood buds at apex (magnified about 8 diam.), one of which is 

 enlarged 120 diam. in A', B, tip of leaf of Syrrhopodon sender (magnified about 10 

 diam.) showing brood buds ; B' . some more enlarged (about 40 diam.). After Kerner. 



A B 



FIG. 293. Young plants developing from adventitious buds on leaves of a fern (Asple- 

 nium bulbiferum\, from which they readily separate to form new plants. A, natural 

 size. B, magnified 2 diam. After Kerner. 



