2 78 



PLANT LIFE. 



the filamentous algae and fungi (figs. 307, 308). In the 

 thallus of multicellular algas it may be the terminal cell of a 



a A 



Fig. 308. — Sex organs of water flannel {I'aucheria sessilis). A, a portion of filament 

 with two lateral branches, a, Ag. In a the spermary has already heen divided from 

 the body cavity by a partition wall. In r'x , a partition will form at juncture with main 

 axis (see fig. /■). when . , becomes the ovary. B, the ovary, mature, having opened 

 and extruded .v/, a portion of the protoplasm.. What remains is the egg. The chloro- 

 plasts have accumulated, leaving a clear receptive spot opposite entrance of ovary. ( , 

 sperms, which escape at maturity from A, <i. D, ovary with egg about to be fertil- 

 ized; the sperms have collected at the opening. A, />', /», magnified about ioodiam. 

 C, magnified much more (about 350 diam.?). A, />, after Sachs; />', C, after Prings- 

 heim. 



branch or, in the leaf-like forms, a cluster of surface cells. 

 In Fucus the spermaries (figs. 309, 310) are terminal cells 

 of much-branched hairs which J 



develop from the surface cells 

 of a narrow-mouthed pit like 





Fig. 309.— A portion of a branched hair from a conceptacle of bladder wrack (/■:,, us 

 vesicutosus). The darker cells are the spermaries. Magnified 160 diam. — After 

 Thuret. 



Fig. 310. — Spermaries of Fucus vesiculosus, showing the escape of the sperms. Magni- 

 fied 350 diam. — After Thuret. 



