INDEX. 



969 



Pollen-grains of Abietinese, ii. 721. 



oil on, ii. 101, 



sculpturing, ii. 100. 



specific diflPerences, ii. 490. 



visciu, ii. 101, 



Pollen-masses, concealment and withdrawal, 



ii. 252. 

 PoUen-mother-cellB, ii. 96. 

 Pollen-sac=microBporangium, ii. 478. 

 Pollen-sacs, dehiscence, ii. 91. 

 Pollea tetrads and sticky stigmas, ii. 283. 

 Pollen transference, explosive apparatus, ii. 



266, 267. 



percussive apparatus, ii. 261. 



sprinkling apparatus, ii. 271, 273, 275. 



Pollen-tube, attraction by sugar-solutions, ii. 



413. 



course, ii. 408. 



in Rook-rose, xi. 411, 



development of, ii. 106, 409, 



nuclei and fertilization, ii, 416. 



Pollination, adaptation to, i. 740 et seq. 



— after results, ii. 285. 



— agents in, ii. 129, 



— and fertilization, interval between, ii. 285. 

 — - and insects, ii, 95, 



— and withering of corolla, ii, 286. 



— by kangaroos, ii, 230. 



— conditions of successful, ii. 405. 



— of Vallisneria, ii. 132, 



— relation to fertilization, ii. 401. 

 PoUinia, natiire of, ii. 97. 



— of Epipactis latifolia, ii. 255l. 



— of Epipogium aphyllum, ii, 226, 



— of PhalEenopsis Schilleriana, ii, 227. 

 Polyembryony, in Angiosperms, ii. 468. 

 Polygala amara, stamen, ii. 87. 

 Polygalaceae, cleistogamy in, ii. 393. 



— staminal filament, ii. 88. 

 Polygonacese, phyllocladous species, i. 334. 



— rolling of leaf, i. 348. 

 PolygonatumverticiUatum.mechanicaltissue 



arrangement, i. 730. 

 Polygonum amphibium, leaf-rosette, i. 412. 



protection of stomata from moisture, i. 



.294, 

 Polygonum Bistorta, effect of mutilation, ii. 



517. 



geitonogamy, ii. 327. 



Polygonimi bulbiferum, bulbils, ii. 454. 

 Po^gonum Convolvulus, twining, i. 682, 685. 

 Polygonum Sieboldi, seed-dispersal, ii. 853. 

 Polygonum virginicum, seed-dispersal, ii. 841. 

 Polygonimi viviparum, dispersal of bulbils, 



ii. 454, 819. 



ice-melting, i. 500. 



rolling of leaf, i, 348. 



Polyhedra, of Hydrodictyon, ii. 641, 

 Polypefcalae, floral characteristic, ii. 748, 



— of Bentham and Hooker, ii. 604. 

 Polyphagus Euglense, i. 169; ii. 668. 



life-history, i. 170; ii. 671. 



Polypodiacese, description, ii. 706. 



— sporangium, it. 705. 



Polypodium glaucophyllum, wax on fronds, 



i. 292, 

 Polypodium serpens, sporogenous frond, ii. 



11. 

 Polypodium vulgare, epiphytic, ii. 705. 

 Polyporese, hymeuium, ii. 688. 



— hyphaeof, i. 165, 



Polypoms, destructive nature, ii. 688. 



— fossil remains, ii. 614. 

 Polypoms annosus, ii. 688. 

 Polyporus fomentarius, PI. XIV. ii. 688. 

 Polyporus igniarius, ii. 688. 

 Polyporus perennis, ii. 685. 



Polyporus aulfureus, behaviour of mycelium, 

 i. 167. 



cause of mouldering in wood, i. 263. 



Polysiphonia, luminosity, i. 388. 

 Polystigma rubrum, host, &c., ii. 678. 

 Polytrichacesfi, epiphragm, ii. 703. 



— teeth of peristome, ii. 703- 

 Polytrichum, apophysis, ii. 702, 



— folding of leaf, i. 346. 



— green absorptive cells, i. 85. 



Polytrichum, mechanism for water-absorp- 

 tion, i. 218. 



— phyllotaxis, i. 408. 



— spore-dispersal, ii. 814. 

 Polytrichum commune, leaf, sections, i. 



346. 



sporogonium, &c., ii. 15. 



PomacesB, persistent receptacle, ii. 435. 

 Pondweeds. See Potamogeton. 

 Pontederia crassipes, floats, i. 638, 669. 

 Poplar, suitability as host for Mistletoe, i. 



209. 

 Poppy, in Egyptian tombs, i. 580. 



— metamorphoses of the leaves, i. 11. 

 Populus, dissemination, i. 614. 



— numerous hybrids, ii. 583. 



— pollination, ii. 133. 



— porogamic fertilization, ii. 413. 



— protection of pollen, ii. 119. 



— water-absorption, direct from atmosphere, 



i. 238. 

 Populus alba, age, i. 722. 



deciduous protective woolly hairs, i. 



354. 



dimensions, i. 722. 



mycelial mantle of roots, i. 250. 



pistillate flowers and Tapbrinaaurea, ii. 



524. 

 Populus nigra, adventitious buds, i, 766, 



plants and animals which live upon, 



within, or in association with, i. 256. 

 Populus pyramidalis, venation, i. 631. 

 Populus tremula and nut-galls of Saperda 

 populnea, ii. 543, 



development of adventitious root-buds, 



ii. 26. 



elastic petioles, i. 428. 



leaf, absorption-cups in surface view 



and section, i. 233. 



linear arrangement of offshoots, ii. 795. 



normal and sucker leaves, ii, 515. 



seed, ii. 423. 



two kinds of leaves, i. 238. 



variety in asexual shoots, ii. 471, 



Porlieria hygrometrica, leaf movements, i. 



339, 

 Porogamic fertilization, ii. 412. 

 Porous cells, of Leucobryum, Sphagnum 

 and Laelia gracilis, i. 219. 



— dehiscence of pollen-sacs, ii. 92. 



— envelope of Orchid aerial roots, exfolia- 



tion in soil, i. 223. 

 Porphyra, habit, i. 587. 

 Portulaca, pollen-grains, ii. 98. 



— propagation of hybrids, ii, 556, 

 Portulaca grandiflora, &c., opening and 



closing, ii. 212. 

 Portulaca oleracea, weather and autogamy, 



ii. 391. 

 Posidonia, pollen and pollination, ii. 104. 

 Posoqueria fragrans, flower and visitors, ii. 



225, 

 PotamogetacesB, embryos, ii. 738. 



— habit and pollination, -ii. 738. 

 Potamogeton, adaptation to environment, i. 



424. 

 ~- dichogamy, ii. 135. 



— pollen dispersion, ii. 105. 

 ~ pollination, ii. 133, 

 Potamogeton crispus, ii. 739. 



hibernating shoots, i. 551, 552, 



poUination, ii. 148. 



protogynpus, ii. 311. 



Potamogeton fluitansj^ habit and habitat, ii. 

 502. 



length, i. 388. 



Potamogeton Jieterophyllus, &c., heterophyl- 

 lous, i. 668. 



Potamogeton lucens, amount of lime forma- 

 tion, experimental determination, i. 261, 



Potamogeton natans, position of stomata on 

 leaves, i. 280. 



Potassium, in ash of plants, i. 66. 



— salts of, accumulation through plants, i. 



261. > 

 Potato, sprouting, i. 494, 562. 



— starch, i. 459. 



Potato-disease, due to Phytophthora infes- 



tans, ii. 669. 

 "Potato-rain", cause of, i. 651. 



superstition concerning, ii. 810. 



Potentilla, hybrids, inexhaustible, ii. 585. 



— receptacles and carpels, ii. 76, 



— Marsh. See Coviarum palustre. 



— nectary, ii. 174. 



Potentilla atrosanguinea, autogamy, ii, 381. 

 Potentilla cinerea, hairs, i. 322. 

 Potentilla Clusiana, procumbent, i. 662. 

 Potentilla micrantha, flower, ii. 174. 



nectary concealment, ii. 181. 



Potentilla nitida, procumbent, i. 662. 

 Potentilla repens, autogamy, ii. 381. 

 Potentilla reptans, runner, i, 664. 

 Poterium, pollen discharge, ii. 145. 



— protogynous, ii. 313. 



Poterium polygamum, polygamous flower- 

 heads, ii. 294. 

 Pothoidese, cUmbing habit, ii. 745. 

 Pothos, vegetative propagation, ii. 800. 

 Pottia intermedia, protonema, ii. 799. 

 Prangos, seed protection, ii. 450. 

 Pressure and turgidity, i. 511. 

 Prickles, protective, i. 433. 



— sorts of, i. 439. 

 Prickly Pear. See Opuntia. 

 Primeval forest, Ceylon, ii. 741. 

 Himalayas, ii. 743. 



Primordial utricle, meaning of term, i. 25. 

 Primula, flowers after pollination, ii. 286. 



— hcterostyly, ii. 302. 



— hybrids, ii. 585. 



— in cultivation, ii. 575. 



— pull of roots, i. 767. 



Primula Auricula and P. Camiolica, colour 

 of flowers and hybrid, ii. 567. 



autogamy, ii, 396, 397, 



dichogamous blossoming, ii. 312. 



heterostyly and hybridization, ii. 316. 



scent, ii. 200. 



Primula Cashmiriana, protection of pollen 



from wet, ii. 111. 

 Primula Clusiana and TTromyces Primulse 



integrifoliSQ, ii. 525. 

 Primula denticulata, protection of pollen 



from wet, ii. 111. 

 Primula elatior and hybridization, ii. 404. 



effect of mutilation, ii. 517. 



Primula f arinosa, effect of mutilation, ii. 517. 



wax on leaves, i. 291. 



Primula glutinosa, autogamy, ii, 396. 



hybridization, ii, 404. 



sticky foliage, ii. 236. 



Primula hirsuta, prey capturing, i, 155. 

 Primula japonica, antholysis, ii. 79. 



green flower, ii. 86. 



Primula longiflora, autogamy, ii. 396, 397. 

 Primula minima, autogamy, ii. 396. 

 Primula oflicinalis, heterostyly and differ- 

 ences in pollen-grains, section, ii. 405. 



hybridization, ii. 404, 



Primula sinensis, absorption of ammouia, i. 



65, 

 Primula veris. See P. offiainaUs. 

 PrimulacesB, ii. 770. 



— autogamy in, ii. 341. 



— heterostyly in, ii. 302. 



— hybrids among, ii. 585. 



— pollen and probosces of insects, ii. 248. 



— protection of pollen, ii. 118. 



— rolling of leaf, i. 348, 



— variety of venation, i, 635. 

 Privet. See LigiLstrwm vulgm-e. 

 Probosces of insects andpoUen, ii. 248. 

 Procumbent stem, characteristics, i. 661. 

 Projection of seeds, range of, ii. 839. 

 Prolepsis, doctrine of, i. 8. 



— in formation of "Rose Willows", ii. 546. 



— in Witches' Broom, ii. 527. 

 Promycelium, of Hemibasidii, ii. 675. 

 Pronuba yuccasella, pollination of Yucca, ii. 



157, 245. 

 Propagation, artificial, from roots, ii. 27. 



— by brood-bodies and fertilization respect- 



ively, ii. 70. 



