262 



PLANT LIFE. 



f m m 



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. 2qo) 

 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 stemof Aulacomnium audrc- 

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

 enlarged 120 diam. in A' t 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 {As/>le- 

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



size. B, magnified 2 diam. — After Kerner 



