Igo! | 
8 aa Thomas A., ie ge 444 
Williamson, E. B., work of 42 
Willows, Ball 0 n 434% ee on 434 
Win kenwerder, H. A., personal 443 
Woods, Albert ¥. non st 
Wyoming plants, Nelson on 153 
ay 
Xylariaceae, Butten on eee 374 
Xylem, middle lamella of 13, 17; 
Cactaceae 41; of pase eae 386 
oO 
INDEX TO VOLUME XXXII 
f 
* 
Yamanouchi, S., work of 374 
Yendo, K., Lage cy 155 
Yucca,-agave-cactus Lace = 
gustifolia 204: : Che mati 
271 ocarpa, iotmatinis 
side fone vegetation 280 
Z 
Zea Mays, double fertilization in 69 
Zygospore of Sporodinia, Gruber on 66 
