INDEX, 



979 



Tetragonidia, 289, 956 (Fig. 



190). 

 Tetragonieae, 662. 

 Tetramerous, 641. 

 Tetraphis, 369 (Figs. 251, 



252). 

 Tetrapoma, 605, 

 Tetraspora, 248. 

 Thalloid Hepaticae, 346. 

 Thallome, 151, 158. 

 Thallophytes, 151, 231, 244. 

 Thallus, 151. 

 Thamnidium, 267. 

 Theca, 344, 374 (Figs. 266, 



267, 271-273). 

 Theobroma, 635. 

 Theoretical diagram, 602. 

 Theory of descent, 940. 

 Thesium, 599, 648. 

 Thickening-ring, 129, 147, 



653. 

 Thread-indicator, 827. 

 Thuja, 514, 527 (Fig. 351). 

 Thujopsidae, 527. 

 Thunbergia, 34 (Fig. 36). 

 Thymelaeaceae, 662. 

 Thymelaeineae, 662. 

 Thyrsopteris, 419. 

 Tilia, 652 (Fig. 463). 

 Tiliaceae, 646, 661. 

 Tissues, Forms and Systems 



of, 79- 

 Tissues, Morphology of, 70, 



948. 

 Tmesipteris, 462. 

 Torenia, 581. 

 Torreya, 519, 527,958. 

 Torsion, 859. 

 Torus, 490, 559. 

 Trabeculsp, 479 (Fig. 334). 

 Tracheides, 75, 116, 949. 

 Traction, Action of, on 



growth, 809. 

 Tradescantia, 554, 577. 

 Trama, 338 (Fig. 227). 

 Transfusion-tissue, 533. 

 Transpiration, 678, 961. 

 Transpiration current, 682. 

 Transport of assimilated sub- 

 stances, 711. 

 Transverse wall, 426. 

 Trapa, 586, 592, 633 (Fig. 



125). 

 Traube's artificial cells, 671, 



961. 

 Tree-ferns, 215, 433. 

 Tremellineae, 336,956. 

 Trichoblast, 85 (Figs. 70, 



466). 

 Trichogyne, 238, 288, 290, 



329 (Figs. 164, 188-190). 

 Trichomanes, 421, 441. 

 Trichome, 150, 160. 

 Trichomes, of Ferns, 435. 



Trichophore, 238, 288, 292. 

 Tricoccae, 661. 

 Tricyclic, 601. 

 Trifolium, 599. 

 Triglochin, 577, 626. 

 Trimorphism, 907. 

 Triphragmium, 332. 

 Tritonia, 577. 

 Trochodendron, 651. 

 Tropaeolaceae, 660. 

 Tropaeolum, 14, 586, 640, 



865, 936 (Fig. 486). 

 Truffle, 314. 

 Tsuga, 527,533- 

 Tuber, 215, 216, 226, 704, 



935. 

 Tuber (truffle), 308, 315. 

 Tuberaceae, 314. 

 Tubiflorae, 658. 

 Tuhpa, 715 (Fig. 470). 

 Tiillen, 24, 810. 

 Turgidity, 781, 788, 962. 

 Turneraceae, 659. 

 Twining of climbing plants, 



862. 

 Twining of tendrils, 865. 

 Twining stems, 217, 862. 

 Tyloses, 24, 810. 

 Type, 941. 



Typha, 491, 541, 542, 564. 

 Typhaceae, 573, 631. 

 Tyrosine, 718. 



Udotea, 272. 

 Ulex, 652. 

 Ulmaceae, 656. 

 Ulmus, 584, 940. 

 Ulothricaceae, 257. 

 Ulothrix, 252, 253, 257, 901, 



902. 

 Ulvaceae, 281. 

 Umbel, 596. 



Umbel, Cymose, 185, 596. 

 Umbellicaria, 325. 

 Umbelliferae, 661. 

 Umbelliflorae, 661. 

 Uncaria, 962. 

 Unequal growth, 854. 

 Unguis, 539. 

 Unicellular plants, 79, 232, 



692. 

 Unilateral cicinal cyme, 597. 

 Unilateral helicoid cyme, 



597. 

 Uredineae, 330, 956. 

 Uredo, 330. 

 Uredospore, 330, 333 (Fig. 



223). 

 Urn, 344, 374. 

 Uromyces, 332. 

 Uropedium, 603. 

 Urticaceae, 100, 656. 

 Urticeae, 656. 

 Urticineae, 656. 



Usnea, 320, 321, 327 (Figs. 



213, 217, 221). 

 Ustilagineae, 335, 956. 

 Utricular vessels, 88 (Fig. 7 3). 

 Utricularia, 639. 



Vaccinieae, 659. 

 Vaccinium, 648. 

 Vacuole, 3, 38, 40. 

 Vaginula, 344, 374. 

 Valeriana, 643 (Fig. 443). 

 Valerianaceae, 643, 658. 

 Vallisneria, 43, 769. 

 Vallisnerieae, 631. 

 Valonia, 946. 

 Vanilla, 935. 

 Variation, 777. 

 Variation of hybrids, 918. 

 Varieties, Origin of, 920. 

 Variety, 921. 

 Variety-hybrid, 915. 

 Vascular Cryptogams, 385. 

 Vaucheria, 41, 244, 269, 270, 

 271, 897 (Figs. 40, 176, 



177). 

 Vegetable ivory, 587. 

 Vegetative cone, 138. 

 Veins, 122. 

 Velamen, 98. 



Velum, 337, 475 (Fig. 225). 

 Venation, 213, 624, 641. 

 Ventral canal-cell, 350, 386, 



395, 425, 446 (Figs. 256, 



295). 

 Veratrum, 596. 

 Verbascum, 577. 

 Verbenaceae, 658. 

 Veronica, 599. 

 Verrucarieae, 329. 

 Versatile anther, 543. 

 Verticillate flowers, 600. 

 Vessels, 80, 116, 949. 

 Vibratile cilia, 4, 240. 

 Vicia, 635, 882, 936 (Figs. 



436,477)- 

 Victoria regia, 640. 

 Vine, 837, 935, 936. 

 Viola, 568, 586, 912 (Figs. 



395, 400, 401, 491)- 

 Violaceae, 659. 

 Virginian creeper, 837, 937. 

 Viscum, 578. 

 Vitis, 639, 865 (Fig. 457). 

 Volkmannia, 408. 

 Volvocineae, 244, 278. 

 Volvox, 278, 945. 



Water, Ascent of, from the 



root, 685. 

 Water, Currents of, in the 



wood, 679. 

 Water, Exudation of, 676. 

 Water, Movements of, 674. 

 Water of crystallisation, 3 1 . 



