432 



BOTANY 



PART II 



leads, are separated from each other by tissue provided with air chambers. (The 

 structure of the antheridia and spermatozoids is illustrated by Fig. 366 and the 

 accompanying description. ) 



Jrw. 



au) 



Fig 



. 372. — Marchanfia pohjmorpha. A, a female plant, with four archegoniopliores of diflferentages; 

 b, gemma-cu])S (iiat. size). B, under side of receptacle ; st, ray.s ; h, .sheath ; sp, .sporogonium 

 (x3). C, half of a receptacle, divided longitudinally (x 5). D, longitudinal section of a ynung 

 sporogonium ; spf, the foot ; sp, sporogenou.s ti.ssue ; kw, wall of cap.sule ; ait', wall, and 7i, 

 neck, of archegonium ; p, pseudo-perianth (xTO). E, ruptured sporogonium; k, capsule; s, 

 spores and elaters ; p, pseudo-perianth; c, archegonial wall (xlO). F, an elater. G, ripe 

 spores (x315). H, germinating spore (s) ; vk, germ tube; /.-, germ-disc, with the apical cell 

 V and rhizoid rli (xlOO). (f, K, after Bischoff ; B, D, F-II, after Kny.) 



The female branches terminate eacli in a uine-rayed disc (Fig. 372, A). The 

 upper surface of the disc, between the rays, becomes displaced in the in-ocess of 

 growth, and, as the archegonia are borne on these portions, they seem to arise from 



