484 
Wood Aceh of dicotyledons, 
128 
Wood pulp, 151-152 
Wood ray, 126 (note) 
Wounds, 156_ 
Xerophilous forests, 452 
_ Xerophytes, 11, 13 
Xerophytic leaves, 448 ; of Coniferales, 
420 
Xerophytic plants, 63 
Xerophytic structure of orchids, 436 
AXylaria, 352* 
Xylem, 98; in conducting system of 
leaf, Shee of dicotyledonous stele, 
121; of Hrythroxrylon coca, 85* ; in 
Izora, 33* ; and transpiration, 58 
Yams, 2038 
Yeast, 352-353, 364 




Ylang-ylang ( Candnpieee erate), 
fruits of, 273* ; stem of, 143" 
Yucca alata, 66* ae 
Zamia floridana, 408, 409*, 4114, 412%, 
416% | 
Zea mays (Indian corn), section of leat s 
of, 38* 
Zebrina pendula (Wandering Tow), } 
stoma of, 67* = as 
Zein, 291 
Zephyranthes rosea, nae of, 222* 
Zoobsporangia, 345 
Zoospores, 311, 320-3821- 
Zygomycetes, 347-351 ; ; relationship ote 
349-351 ; Rhizopus nigricans, 347— “A 
349 ee 
Zygospores, 320-321, 336-337; in — 
molds, 348%, 349% a 
Zygote, 236 a 
eet 
