INDEX 



585 



tivo, 127, 127*, 12S*; roproduc- 

 tivo, 133; secretory, 133, 133*; 

 storage, 132; strengthening, 129, 

 129*, 130*. 



Toadstools, 382; described, 384; de- 

 structive, 388. 



Tobacco, flower, 13, 12*; leaf arrange- 

 ment, 239*. 



Tomato, described, 491; ovary, 36, 

 34*, 36*; pistil natural size, 37, 

 37*. 



Torus, 12. 



Toxins, 123. 



Tracheae, 131. 



Tracheids, 130, 131*. 



Trailing Arbutus, 490. 



Transpiration, 241; advantages, 263; 

 amount, 262; conditions affect- 

 ing, 263; dangers, 265; described, 

 260-269; protection against, 266. 



Traumatropsim, 152. 



Tree Ferns, 427, 428*. 



Trichogyne, 327. 



True Ferns, 426. 



Truffles, 366. 



Tryptophane, 281. 



Tube nucleus, 42, 42*. 



Tuber, 179, 179*; described, 181. 



Tuberales, 366. 



Tubular Algae, 316-318. 



Tubular flowers, 25, 24*. 



Turgor pressure, 119. 



Twiners, 176. 



Typhaceae, 495. 



Tyrosin, 281. 



Ulothrix, 311, 311*. 

 UmbeUiferae, 488. 

 Umbel, 30, 30*, 32*. 

 Uredinales, 396. 

 Uredospore, 399. 

 Urticaceae, 478. 



Vacuoles, 114, 114*, 115*, 156*. 

 Variation, 517, 518*, 519*. 



Variation, causes, 531; continuous, 

 525, 526*; discontinuous, 527. 



Vascular bundles, 130, 130*. 



Vascular cylinder, 145, 146, 146*. 



Vaucheria, 317, 316*. 



Vegetative reproduction, 409, 422. 



Vein, 244, 244*. 



Veinlets, 245, 244*. 



Velamen, 163. 



Venation, 245; netted, 245, 244*; 

 parallel, 245, 244*. 



Venter, 409, 410*. 



Venus Flytrap, 273, 273* 



Vernal habit, 170. 



Volva, 386, 384*. 



Volvocales, 307. 



Volvox, 305, 306*. 



Walnut family, 474. 



Warmth, as an ecological factor, 501. 



Water, as an ecological factor, 50] . 



Water Ferns, 426. 



Water Mold, 353. 



Wliite Heart Rot, 389. 



White Rust, 359. 



WiUow family, 473. 



Wflt Disease, 378. 



Wind, as an ecological factor, 502. 



Wing, of corolla, 24, 23*. 



Witches' Brooms, 377. 



Wood fiber, 129, 130, 130*. 



XanthophyU, 284. 

 Xenia, 51, 51*. 



Xerophytic societies, 509; kinds, 510. 

 Xylem, 130, 130*; of roots, 146, 149, 

 146*, 149*; of stems, 188, 190*. 



Yeasts, 377. 



Zooglea stage of Bacteria, 342, 343*. 

 Zoospores, 302. 

 Zygospore, 302. 

 Zygote, 302. 

 Zymase, 94, 285. 



