INDEX 657 



Sphenopteris type, 580 Marchantiaceae, 69 



ventral hairs, water supply, 229, 568 



Metzgeria, 86 Webera nutans, 160 



ventral lamellse Weisia, 218 



Ricciocarpus, 40 Woodwardia radicans ; Figs. 183, 

 ventral scales, 42 184 



Marchantiaceae, 43 



Viscum, 504 xerophytes, 230 



Vittaria, 233, 393, 394 xerophytic Marchantiaceae, 67 



walking fern, 310 Yucca, 553, 590 

 water-absorption, 565, 566 



water-conducting cells, 222 Zamia, 321 



water-conduction, 565 zoospores, 9, 86, 563, 564, 593 



water-conservation zygote, 563, 566, 569 



