INDEX AND GLOSSARY 



579 



Valonia, non-septate sac of, 139. 



Vascular-strand, of Dicotyledons, 37 

 (Figs. 23, 24), 47 (Fig. 33) ; of 

 Cucumber, 41 (Fig. 25) ; of Mono- 

 cotyledon, 45 (Fig. 32). 



Vascular-system, 33, 34 (Figs. 20, 21), 

 37 ; of Male-Fern, 328 (Fig. 267). 



Vascular- tissue, 38 (Figs. 23, 24). 



Vaucheria, non-septate tubes of, 139 ; 

 chlamidospores of, 398, 426 ; life- 

 history of, 395 (Figs. 334-336) ; 

 comparison with Peronosporeae, 

 420, 422. 



Vegetable food-stuffs, 540, Appendix B. 



Vegetative-cell, in pollen-grain, the 

 cell from which the pollen-tube 

 is formed, but does not itself take 

 part in syngamy, 247 (Fig. 194). 



Vegetative-propagation, increase in 

 numbers by detachment of a part 

 of a vegetative plant-body, Chap, 

 xii., p. 211, 300 (Fig. 244) ; rare 

 in Conifers, 305 ; in Ferns, 336, 



477- 

 Veins of leaf, 60 (Fig. 45), 64 (Fig. 



46). 

 Vellozia, fission of stamens of, 232 



(Fig. 181). 



Velum, of Mushroom, 453. 

 Venation, parallel and reticulate, 60 



(Fig. 43). 

 Ventilating-system, of intercellular 



spaces, 36 ; of sporophyte, 487. 

 Ventral- canal- cell, of Pine, 311 (Fig. 



2 53) > f Selaginella, 321 ; of Fern, 



344 (Fig. 285) ; of Moss, 361 (Fig. 



304)- 



Venus' fly- trap, carnivorous habit of, 

 208. 



Verbena, spike of, 225 (Fig. 172). 



Verbenales, 493, 532. 



Veronica, meiomeryin, 235 (Fig. 183); 

 flower of, 530 (Fig. 437). 



Vessel, result of fusion of two or 

 more cells, by absorption of septa 

 and protoplasmic contents, to form 

 an open channel, 29 (Fig. 18), 38, 

 39 (Fig. 24), 40, 50 (Fig. 37). 



Vestigial remains, parts imperfectly 

 developed which mark the place 

 where normally a fully developed 

 part would be, 235 (Fig. 183). 



Vetch, tendril of, 182. 



Vexillum, the posterior petal of Pea- 

 flowers, 522 (Fig. 431). 



Vibrio, slightly spiral-shape of Bac- 

 teria, 458. 



Vicia Faba (Broad Bean), 6 (Fig. 2) ; 

 root- tubercles of, 205 (Figs. 155, 

 156) ; analysis of, 542 ; origin of, 

 543- 



Vine (Vitis Vinifera), panicle of, 227 

 (Fig. 174) ; origin of, 543. 



Violaceae, transfer of seeds, 294. 



Violet, stylar channel of, 257 ; dis- 

 semination of seeds, 288. 



Virginia creeper (Ampelopsis Vetchii), 

 climbing shoots negatively helio- 

 tropic, 127 ; adhesive climbing of. 

 184 (Fig. 137). 



Viviparous habit, 477. 



Volvocales, 390, 391 (Fig. 329). 



Walnut, 544. 



Water, proportion of in plants, 84 ; 

 in the soil, 75 (Fig. 57), 85 ; con- 

 duction by woody stem, 57 ; 

 storage in xerophytes, 175. 



Water- culture, recipes for, 93, 94 

 (Fig. 70). 



Water-economy, 94. 



Water-lily, floating leaves, 178 ; peri- 

 sperm of, 281. 



Water-relation, Chap. vi. ; its effect 

 on adaptive organisms, 175. 



Water-transport, of seeds and fruits, 

 290. 



Wax, covering surfaces of xerophytes, 

 176. 



Weeds, unconscious transfer by man, 

 294. 



Welwitschia, deep-rooted, 176 ; cor- 

 relation in, 184. 



Wheat, as host of Puccinia, 443 

 (Fig. 375) ; infection by Aecidium 

 spores, 444 ; by Uredospores, 445 

 (Fig. 379) ; structure of, 545 (Fig. 

 446) ; analysis of, 547 ; origin of, 



548. 



Whole-meal, 547. 

 Wild-hyacinth (Scilla), 495- 

 Willow (Salix), 505 (Figs. 408-411). 

 Willows (Pollarded), flora of, 295. 

 Wind, as pollinating agent, 265 ; in 



dissemination of seeds, 289. 

 Winter- Kale (Brassica), analysis of, 



541 ; origin of, 542. 

 Winter-spores (Teleutospores) of 



Puccinia, 443 (Figs. 375, 380) ; 



germination of, 446 (Fig. 381). 

 Wood-fibres, 50 (Fig. 37), 145. 

 Wood-parenchyma, 51 (Fig. 37). 

 Wood-rush, 492, 500 (Fig. 403). 



