INDEX 



463 



Trichogj^ne, 87 



Batrachospennum. 90 



Nemalion, 88 



Polysiphonia, 92 



Pyroneina. 130 



Venturia, 137 

 Trillium, floral structure, 373 

 THber, 134 

 Tulierales, 134 

 Tubiflorales, 405 

 Tunica, 367 



U 



Ulothrix, 38 

 Ulotrichales, 38 

 summary, 44 

 Ulva, 41, 42 

 Umbellales, 404 

 Uncinula, 127 

 Uredinales, 142 

 Uredinium, 142, 143 

 Uredospore, 142, 143 

 Uroglena, 16 

 Urticales, 400 

 Ustilaginales, 140 

 Ustilago, 141 



Vallecular canal, 252, 253 

 Vascular anatomy, Angiospermae, 363- 

 372 



Coniferales, 344 



Cycadales, 320 



Equisetales, 252 



Filicales, 276 



Ginkgoales, 335 



Gnetales, 354 



Isoetales, 242 



Lycopodiales, 220 



Marattiales, 270 



Ophioglossales, 263 



Psilotales, 215 



Selaginellales, 231 

 Vascular bundle, Acorns, 372 



Pteridium, 284 

 Vascular system, development of xylem, 

 210 



traces and gaps, 212 



types of steles, 211 

 Vascular tissues, arrangement, 211 

 Vaucheria, 57, 58, 59 

 Vegetative body, algae, 95 



fungi, 157 

 Vegetative organs (Angiospermae), 363 



leaf structure, 363 



Vegetative organs (Angiospermae), ma- 

 ture root, 364, 366 



older stem, 368, 370 



root tip, 364, 365 



stelar types, 370 



stem tip, 367, 368 

 Velum, Agarinis, 148, 149 



Isoetes, 243, 244 

 Venturia, 137, 138 

 Vernation, circinate, 278, 320 

 Vessel, 210, 369 

 Volva, 149 

 Volvocales, 26 



summarv, 32 

 Volvox, 30] 31 



W 



Welwitschia, 354. 356 



ovule, 358 



strobili, 358 

 Wheat rust, 142 

 Woodwardia, leaflet, 285 



X 



Xanthophyceae, 18 



summary, 94 

 Xanthophyll, 19 

 Xijlaria, 139 

 Xylem, development, 210 



elements, 369 



primary, 211 



secondary, 211 



Zamia, embryo, 330 



female cone, 322 



leaflets, 320 



male cones, 322 



megasporophyll, 325 



microsporangium, 324 



ovule, 326 



sperm, 328 



stem, 321 

 Zanardinia, 72 

 Zea, stem, 371 

 Zonal development, 375 

 Zonaria, 75 

 Zoospore, 19 



Chlamydonionas. 27 



Chlorococcmu, 33 



Chytridium. 108 



Cladophora. 55 



Coleochaete, 43 



Cutleria, 71 



