488 



INDEX 



Toxins, 153 

 Tracheids, 9 

 Tradescantia, stoma, 36 

 Transpiration, 23 

 Transport of water, 54 

 Tree ferns, 309 

 Trichogyne, 200, 201, 235 

 TrufHes, 222 



Tube cell, 114, 115, 343, 355 

 Tubercles, 60, 61 

 Tuberculosis, 152 

 Tubers, 105 

 Turgor, 78 

 Twigs, 68 



Twining stems, 100 

 Typha, 365, 386, 388 



Ulothrix, 179, 180, 181 

 Umbel, 451 

 Umbellales, 450 

 Uncinula, 223, 226 

 Uredinial stage, 235 

 Uredinales, 232 

 Urediniospores, 235, 236 

 Urticales, 419, 421 

 Ustilaginales, 239 

 Ustilago, 239 

 Utricularia, 465 



Vaccinium, 457 



Vacuoles, i, 2, 3, 55, 205 



Valerian, 468 



Variation, 99, 131-138, 166, 174, 179 



Variegated plants, 14 



Vascular bundles, 11, 12, 16, 73, 74 



75- 91. 308 

 Vaucheria, 183, 184, 185 

 Veins, 11, 119, 282, 298 

 Velamen, 407 

 Vdtheimia, 386 

 Velum, 241, 243 

 Venation, 7, 384, 385 

 Veratrum, 403 

 Vernonia, 476 

 Venatile anthers, 393 

 Vessels, 73, 75 



Viburnum, 467 

 Vitis, 446 

 Volva, 242, 243 

 Volvocales, 164 

 Volvox, 169, 170 



Wallace's Law, 408 



Wall cells, 260, 302, 333, 343, 354, 377 



formation of, 51-54 

 Ward, 23 

 Water, capillary, 47 



hygroscopic, 47 



lily, 382, 423, 425 

 Weeds, 430 

 Willow, 415 



order, 414 

 Wilting, cause of, 23 

 Winged fruits, 383 

 Witches' broom, 238 

 Wolffia 396 

 Wood, heart, 90 



oak, 89 



pine, 348 



sap, 90 



sections. 88, 89 



spring, 85 



summer, 86 

 Woodsia, 313 

 Woodwardia, 310, 313 

 Work of plants. 15 



Xanthidium, 177 

 Xerophytes, 37, 43 

 Xylaria, 228 

 Xylem, 54 73, 74 



Yamanouchi, 203 

 Yeast, 216, 217 

 Yucca, 402 



Zamia, 339, 340, 341, 343 

 Zoogonidia, 182 

 Zoospore, 144 

 Zygnema, 174 175 

 Zygnematales, 174 

 Zygomorphic, 371 



