178 



PLA\T LIFE. 



the filamentous alg£e and fungi (figs. 307, 30S). In the 

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



ii A 





Fig. 30S. — Sex organs of \\ater flannel {ranchcria sfssiiis). A , a portion of filament 

 with two lateral branches, a, oj^--. In a the spermary has already been divided from 

 the body ca^'ity by a partition wall. In o^\ a partition will form at juncture with main 

 axis {see fig. B), when Oi;- becomes the ovary. A', the o^'ary, mature, lia\-ing opened 

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

 plasts have accumulated. Iea\'inga clear receptive spot opposite entrance of ovary. C, 

 sperms, whic!i escape at maturity from A, ci. D, o\'ary with egg about to be fertil- 

 ized ; the sperms have collected at the opening. A , Ji, /', magnified about loo diam. 

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

 heim. 



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



In Fucus the spermaries (figs. 309, 3T0) are terminal cells 



of much-branched hairs Avhich J 



develop from the sui-face cells 



of a narrow-monlhed ])it like ®i//*f \' 



Fig. 309. — A portion of a branched hair frnm a conceptacle of bladder wrack (Fu, 

 vesicKlosKs). The darker cells are the spermaries. IMagnified ibo diam.— Af 

 Thuret. 



Fig. 310. — Spe 

 fied 



■After 



iret. 



10. — Spermaries of Funis 7'<'i-/i-///<'j-;/j-, showing the escape of the sperms- Magni- 



350 diam.— After Thurtt, 



