INDEX. 



983 



Wedge-roota, of Loranthus Europseua, mode 



of growth, &c., i. 211. 

 Wedge-shaped apical-cell, i. 578. 

 "Weeping, of plants, explanation, i. 271. 



— in Aroid roots, i. 366. 



— of Vines, when most vigorous, i. 270. 

 AVellingtonia. See Sequoia gigantea. 

 "Welwitschia mirabilis, in habitat, ii. 727- 



geogi-aphical distribution, ii. 726. 



West-Indian Sour-sop. ^eeAnona muricata, 

 Wettstein, and anatomical characteristics of 



hybrids, ii. 565. 

 Wheat, seeds and heat, i. 555. 



— starch, i. 459. 



White, -visibility to insects, ii. 197. 

 White HeUebore. See Veratrum. 

 White Mustard. See Siriapis alba. 

 White-thorn. See Cratcegus Oxyacantha. 

 Whitlow-grass. See Draba. 

 Whorl, of perianth-leaves, i. 641. 

 Whorls, sorts of, i. 397. 

 Whortleberry, Common. See Vacdnium 



Myrtillus. 

 Wichura, hybridization of Willows, ii. 560. 

 Wigandia urens, stinging hairs, i. 441. 

 Wightia, clinging roots, i. 702, 754. 

 Wild Cress. See MtKionema. 

 Wild Pear, spines, i. 433, 

 Will-o'-the-Wisp, and luminous mycelium, i. 



503. 

 Willow. See Salix. 

 WUlow, Gray. See Salix incana. 

 Willow-herb. See Epilohium. 

 Willows, Alpine, Tyrol, i. 624. 

 Wind, agent in spore-dispersal, ii. 812. 



— and fruit boring, i. 618. 



— and position of leaves, i. 427. 



— and seed dispersal, ii. 447. 



— and stunted growth, i. 524. 



Wind Bent-grass. See Apera spicaventi. 

 Wind-fertilized plants, characteristics, ii. 133. 

 Wind-pollination,adaptation of stigma, ii. 151. 

 Wind-witches, ii. 850. 

 Wine-cask Fungus, i. 508. 

 Wine-flower scent, ii. 202. 

 Wings of Papilionaceous flower, ii. 228. 

 Winter-buds, of Aldrovandia, i. 152. 

 Winter Cherry. See Phy sails Alkekengi. 

 Winter-green. See Pyrola. 

 Winter resting of plants, i. 562. 

 Witches' Brooms and Exoascus, ii. 676. 



caused by gaU-mites, ii. 548. 



cause of, ii. 518. 



on Abies pectinata, ii. 526. 



on various trees, ii. 527. 



Wolfaa, rootless, ii. 745. 



Wood, ascent of sap through, i 274. 



— changes due to attack of hyphse, i. 167. 



— longitudinal splitting in twiners and 



climbers, i. 733. 



— "luminous", i. 502. 



— of host, effect of Langsdorffia on, i. 187. 

 Wood-ash, effect on Mosses, Grasses, Poly- 



gonaceous and Cruciferous plants, i. 74. 



TVoodbine, Alpine. See Lonicera Alpigena. 



Wooden Pear. See Xylomelum pyriforme. 



Wood-parenchyma, i. 469. 



Woodruff. See Asve^rula odorata. 



Wood-sorrel. See Oxalis. 



Wood-veasels and cell, views regarding func- 

 tion, i. 276. 



Woody fibres, nature of, i. 726. 



Woody stem, characteristics, i. 715. 



Woolly hairs, nature of, i. 320. 



Wormwood, Common. See Artemisia Ab- 



syiithium. 

 Wormwoods, hairy covering in summer, i. 319. 

 Woundwort. See Stachys. 

 Wracks. See JFucacete. 

 Wraugelia, luminosity, i. 388. 



X. 



Xanthidium aculeatum, ii. 492, 655. 

 Xanthidium octocorne, ii. 492. 

 Xanthium, protogynous, ii. 313. 

 Xanthium spinosum, and cattle, i. 451. 



fruits and dissemination, i. 615. 



hooked capitulum, ii. 873. 



Xanthophyll, from chlorophyll, i. 372. 

 Xanthorrhea, caudex, i. 714. 



— mode of growth, i. 659. 

 Xanthorrhea bastilis,iheight, PI. XVI., ii. 731. 

 Xenogamy, in hybrids, ii. 583. 



— nature of, ii. 317. 



Xeranthemum, hairy covering in summer, i. 



319. 

 Xeranthemum annuum, coloured bracts, ii. 



183. 

 Xylaria Hypoxylon, ii. 679. 



stroma, ii. 681. 



Xylaria polymorpha, stroma, ii. 681. 

 Xylocopa violacea and Spartium scoparium, 



ii. 267. 

 Xylomelum pyriforme, fruit, ii. 430, 431, 751. 

 protecting pericarp, ii. 449. 



Y. 



Yakutsk, winter cold, i. 544. 



Yeast fermentation, nature of, ii. 519. 



— ferment of, i. 465. 



Yeasts. See also Saccharomyces. 



— fermentative, i. 505. 



Yellow granules of autumn leaves, i. 485. 

 Yellow-rattle. See Rhinanthus Crista-galli. 

 Yellow Vetchling. See Lathyrus Aphaca. 

 Yew. See Taxua haccata. 

 Ylang perfume of Zaluzianskia, ii. 242. 

 "York and Lancaster" Rose, ii. 568. 

 Yucca, acicular leaves, i. 434. 



— and insect visits, ii. 222. 



— and night visitors, ii. 196. 



— caudex, i. 714. 



— cotyledon in germination, i. 606. 



— fertilization by Moths and advantage to 



the insects, i. 255. 



— infertility in Europe, ii. 403. 



— mode of growth, i. 660. 



— phyUotaxis, i. 402. 



— pollination by Pronuba yuccasella, ii. 157. 



245. 



Yucca aloefolia, fertilization, ii. 158, 159. 



fertilization, geographical distribution, 



ii. 159. 



Yucca angustifolia, pollen-grams, ii. 97. 



Yucca gloriosa, i. 659 ; ii. 732. 



Yucca Treculeana, fertilization and geo- 

 graphical distribution, ii. 159. 



Yucca Whipplei, non-fruiting, ii. 158. 



Zaluzianskia lychnidea, pollination and 



scent, ii. 202, 241. 

 Zamia, cotyledon in germination, i. 606. 



— spiny leaves, i. 438. 

 Zannichellia, moncecious, ii. 297, 



— pollen and pollination, ii. 105. 



— root origin, i. 766. 

 Zanthoxylon, reserve-buds, ii. 32. 



Zea Mays, and Ustilago Maydis, ii. 524, 675. 



moQ(Ecious, ii. 297. 



protogynous, ii. 313. 



stilt-roots, mechanical tissue, i. 762, 



vitality of spermatoplasm, ii. 96. 



&c., reared in artificial culture solu- 

 tion, i. 100. 

 Zero of growth, i. 561. 

 Zigzag stem, i. 658. 

 Zingiber, venation, i. 634. 

 Zingiberacese, stamens, ii. 736. 

 Zinnia hybrida, colour-contrast in capitulum, 



ii. 191. 

 Zonotrichia, in waterfalls, i. 79. 



— movement of, i. 39. 



Zoogloea, bacterial condition, ii. 622. 



— of Micrococcus prodigiosus, ii. 624. 

 Zoophytes, appropriateness of name, ii. 469. 

 Zoospore, eye-spot, ii. 629. 



— of Botrydium, ii. 642. 



— of Vaucheria, ii. 644. 



Zoospore formation, in Hydrodlctyon, ii. 641. 

 Zoosporese, ii. 606. 

 Zoospores, ii. 17. 



— behaviour towards hght, i. 382. 



— of ChlorophycesB, ii. 628. 

 Zostera, i. 77. 



— habit, &c., i. 666. 



— pollen and poUination, ii. 104, 105 

 Zostera marina, ii. 738. 



Zygsena, and honey scent, ii. 207. 

 Zygnema, cell-division, i. 577, 581. 



— characteristics, ii. 658. 



— chlorophyll bodies, cf. PI. I., i. 373. 



— conjugation, ii. 658. 

 Zygnema pectinatum, PI. I. 

 Zygnemacese, ii. 658. 



— chromatophores, ii. 654, 



— conjugation, ii. 55. 

 Zygnemese, filaments, i. 586. 

 ZygnemoidesB, characteristics, ii. 654. 

 Zygogonium, nature of, ii. 54. 

 Zygomorphic symmetry, ii. 229. 

 Zygomycetes, characteristics, ii. 673. 

 Zygospore investment, in MortiereUese, ii. 674 



— of Mucor, ii. 673. 



— of Mucorini, ii. 481, 484. 

 Zygote, nature of, ii. 54. 



— of Botrydium, ii. 642. 



— of Chlorochytrium, ii. 637. 



— of Oblorophycese, ii. 628. 



— of Conjugatse, ii. 654. 



— of Desmids, ii. 654. 



— of Hydrodlctyon, ii. 641. 



— of Pediastnun, ii. 639. 



— of PhyUobium, 1.(638. 



— of Spirogyra, ii. 658. 



— of Volvox globator, ii. 635. 

 Zygotes of TTlothrix zonata, ii. 648. 

 Zygozoospore, formation, ii. 632. 

 Zygozoospores, of Chlorochytrium, ii. 637. 



— of PhyUobium, ii. 638. 



— of Stephanosphsera, &c., ii. 632. 



END OF VOL. 11. 



