INDEX. 



•',1 



Witches' brooms (fir-trees), 



128. 

 Woodwardia, roots and 



shoots from leaves, 213. 

 Wrangeheae, 78. 



Xylaria, perithecium, 108; 



stroma, 109. 

 Xylem, 309. 

 Xyridieae, 444. 



Yeast-fungus, 81, 113; nu- 

 cleus, 113, note 4; pullu- 

 lation, 81. 



Yucca, 444; exine, 367; 

 growth in thickness, 443. 



Zamia, carpels, 317 ; coty- 

 ledons, 318 ; flowers, 315 ; 

 leaves, 313; microspores, 

 316 ; stem, 344. 



Zamia muricata, flowers. 



314; microsporangia, 516. 



(Fig. 247.) 

 Zamia spiralis, stamina! lent. 



315. (Fig. 249.) 

 Zanardinia, 69. 

 Zannichellia, embryo, 430; 



ovule, 385. 

 Zea, plumule and stem, 432 ; 



pollination, 390; primary 



root, 431 ; primary stem, 



432; synergidae, 389; 



vascular bundles, 442. 



(t'^'g. 355.) 

 Zea Mais, 86, .,31. (Fig. 



355-) 

 Zingibcraceae, st ami nodes, 



440. 

 Zingibereae, 444, 445. (Fig. 



368.) 

 Zoogametes, 5. 

 Zoogloea-forms, 24. 

 Zoogonidia, 11, 84. 



Zoogonidia-receptacles, 1 1. 

 Zoosporangia, 31, 43, 96, 



125. 

 Zoospores, 42. 

 Zostera, pollen-grains, 369. 

 Zygnema, 50. 



Zygnemacruciatum, Fig. 26. 

 Zygnemeae, 49 ; relation to 



Desmidieae, 50. 

 Zygogonium, 50. 

 Zygomorphous, 423. 

 Zygomycetes, 49, 88 ; re- 

 production, 88, 89. 

 Zygophylleae, 469 ; floral 



diagram, 419; flower, 



423. 

 Zygospore, 19, 31, 35, 40, 



42, 49> 50, 5', 83, 89, 90, 



9'- 

 Zygospores, conjugation and 



formation, 5. (Fig. i.) 

 Zygozoospores, 40, 41. 



Pf. C. State CoWnt 



