INDEX 



983 



Wedge-roots, of Loranthus Europffius, mode 



of growth, kc, i. 2U. 

 Wedge-shaped apical-cell, i. 578. 

 Weeping, of plants, explanation, i. 271. 



— in Aroid roots, i. 366. 



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

 Wellingtonia. See Sequoia gigantea. 

 Welwitschia mirabilis, in habitat, ii. 727- 



geographical distribution, ii. 726. 



West-Indian Sour-sop. See A nona 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 Hellebore. See Veratrum. 

 White Mustard. See Sinapis alba. 

 White-thorn. See Cratagus Oxyacantha. 

 Whitlow-grass. See Drdba. 

 Whorl, of perianth-leaves, i. 641. 

 Whorls, sorts of, i. 397. 

 Whortleberry, Cummon. See Vaccinivm 



MyrtiUus. 

 Wichura, hybridization of Willows, ii. 560. 

 Wigandia urens, stinging hairs, i. 441. 

 Wightia, clinging roots, i. 702, 754. 

 Wild Cress. See jSthionema. 

 Wild Pear, spines, i. 433. 

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



503. 

 Willow. See Salix. 

 Willow, Gray. See Salix incana. 

 Willow-herb. See Epilobium. 

 Willows, Alpine, Tyrol, i. 524. 

 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-pollinatioii,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 Aldrovaudia, i. 152. 

 Winter Cheri-y. See Phyaalis Alkekengi. 

 Winter-green. See Pyrola. 

 Winter resting of plants, i. 562. 

 Witches' Brooms and Exoascus, ii. 676. 



caused by gall-mites, ii. 548. 



cause of, ii. 518. 



on Abies pectinata, ii. 526. 



on various trees, ii. 527. 



Wolffia, rootless, ii. 745. 



Wood, ascent of sap through, i. 274. 



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



— longitudinal splitting in twiners and 



climbers, i. 733. 



— "luminous", i. 502. 



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

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



gonaceoua and Cruciferous plants, i. 74. 



Woodbine, Alpine. See Lonicera Alpigena. 



Wooden Pear. See Xylomduvi pyriforme. 



Wood-parenchyma, i. 469. 



Woodruff. See Aspei-ula odorata. 



Wood-sorrel. See OxalU. 



Wood-vessels 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- 



synthium. 

 Wormwoods, hairy covering in summer, i. 319. 

 Woundwort. See Stachys. 

 Wracks. See Fucace(E. 

 Wraugelia. luminosity, i. 3S8. 



X. 



Xanthidium aculeatum, ii. 492. 655. 

 Xanthidium octocorne, ii. 492. 

 Xanthium, protogynous, ii. 313. 

 Xantbium 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 hastilis,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. 



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. 

 Yt'llow-rattle. See Rhiuauthvs Crista-{jallL 

 Yellow Vetchling. See Lathyrits Aphnca. 

 Yew. See Taxus baccata. 

 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. 



— phyllotaxis, i. 402. 



— pollination by Pronuba yuccasella. ii. 157, 



245. 



Yucca aloefolia, fertilization, ii. 158, 159. 



fertilization, geographical distribution, 



ii. 159. 



Yucca angustifolia, pollen-grains, ii. 97. 



Yucca gloriosa, i- 659 ; ii. 732. 



Yucca Treculeana. fertilization and geo- 

 graphical distribution, ii. 159. 



Yucca Whipplei, non-fruiting, ii. 153. 



Z. 



Zaluzianskia lychnidea, pollination and 



scent, ii. 202, 241. 

 Zamia, cotyledon in germination, i. 606. 



— spiny leaves, i. 433. 

 Zannichellia, monoecious, ii. 297. 



— pollen and pollination, ii. 105. 



— root origin, i. 766. 

 Zanthoxylon, reserve-buds, ii. 32. 



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



monoecious, 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. 653. 

 Zingiber, venation, i. 634. 

 ZingiberaceEB, stamens, ii. 736. 

 Zinnia hybrida, colour-contrast in capitulum, 



ii. 191. 

 Zonotrichia, in waterfalls, i. 79. 



— movement of, i. 39, 



Zooglcea, bacterial condition, ii. 622. 



— of Micrococcus prodigiosus, ii. 624. 

 Zoophytes, appropriateness of uame, ii. 469. 

 Zoospore, eye-spot, ii. 629. 



— of Botrydium, ii. 642. 



— of Vaucheria, ii. 644. 



Zoospore formation, in Hydrodictyon, ii. 641. 

 Zoospores, ii. 606. 

 Zoospores, ii. 17. 



— behaviour towards light, i. 382. 



— of Chlorophyceie, 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. 



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



— conjugation, ii. 658. 

 Zygnema pectinatum, PI. I. 

 Zygnemaceze, ii. 658. 



— chromatophores, ii. 654. 



— conjugation, ii. 55. 

 ZygnemeEe, filaments, i. 586. 

 Zygnemoideae, characteristics, ii. 654. 

 Zygogonium, natiure of, ii. 54. 

 Zygomorphic symmetry, ii. 229. 

 Zygomycetes, characteristics, ii. 673. 

 Zygospore investment, in MortierellcK, 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 Chlorophyceffi, ii. 628. 



— of Conjugate, ii. 654. 



— of Desmids, ii. 654. 



— of Hydrodictyon, ii. 641. 



— of Pediastrum, ii. 639. 



— of Phyllobium, i.\638. 



— of Spirogyra, ii. 658. 



— of Volvos globator, ii. 635. 

 Zygotes of Ulothrix zonata. ii. 648. 

 Zygozoospore, formation, ii. 632. 

 Zygozoospores, of Chlorochytrimn, ii. 637. 



— of PhyUobium, ii. 638. 



— of StephauosphEera, &c., ii. 632. 



END OF VOL. 11. 







