980 
"Water of organisation, 31,62. 
Water-pores, 949. 
Watsonia, 584. 
"Wax, 99. 
Wellingtonia, 509. 
Welwitschia, 66, 170, 528, 
531, 953- 
Wendungszellen, 299, 302 
(Fig. 202). 
Whorl, 170, 187. 
Whorl, Spurious, 170, 187. 
Widdringtonia, 527. 
Wistaria, 653, 950. 
Wood, III. 
Woodwardia, 433. 
Wrangelieae, 290. 
Xanthium, 215, 940. 
Xanthophyll, 765. 
INDEX. 
Xanthoxylacese, 660. 
Xylaria, 316. 
Xylem, iii. 
Xylem-portion of fibrovas- 
cular bundle, 116. 
Xylem ray, 1 11, 131. 
Xylophylla, 217, 935. 
Xyrideae, 632. 
Yeast-fungi, 249.- 
Yew, 512, 
Yucca, 127, 629. 
Zamia, 501, 505, 958 (Figs. 
342, 344)- 
Zanichellia, 618. 
Zea, 580, 620, 925. 
Zinc, 695. 
ZingiberacesE, 625, 632 (Fig. 
429). 
Zoogonidia, 12, 240 (Figs. 3 
4, 9, 162, 167, 168, 169 
173, 176, 178, 180, 182). 
Zoospore, 234, 254 (Figs 
167, 168, 181, 183). 
Zoosporeae, 253. 
Zostera, 557. 
Zygnema, 46, 258. 
Zygnemese, 257. 
Zygogonium, 258. 
Zygomorphic, 204,610, 611 
612, 613. 
Zygomycetes, 9, 244, 955- 
Zygophyllaceae, 660. 
Zygospore, 9, 224, 234, 254 
258, 265, 897 (Figs. 162 
167, 168, 170, 171, 174 
T75). 
ZygosporesE, 244, 250. 
THE END. 
