INDEX. 



969 



Pollen-grains of Abietineaj, ii, 721. 



oil on, ii. 101. 



sculpturing, ii. 100. 



specific differences, ii. 490. 



viscin, ii. 101. 



Pollen -masses, concealment and withdrawal, 



ii. 252. 

 Pollen-mother-cellB, ii. 96. 

 PoUen-sac=miGrosporangium, ii. 478. 

 Pollen-sacs, dehiscence, ii. 91. 

 Pollen tetrads and sticky stigmas, ii. 283. 

 Pollen transference, explosive apparatus, ii 



266, 267. 



percussive apparatus, ii. 261. 



sprinMing apparatus, ii. 271, 273, 275. 



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



413. 



course, ii. 408. 



in Rock-rose, ii. 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. 

 Pollinia. nature of, ii. 97. 



— of Epipactis latifolia, ii. 255. 



— of Epipogium aphyllum, ii. 226. 



— of Phalsenopsis Schilleriana, ii. 227. 

 Polyembryony, in Angiosperms, ii. 468. 

 Polygala amara, stamen, ii. 87. 

 Polygalacese, cleistogamy in, ii. 393, 



— staminal filament, ii. 88. 

 Polygonacese, pbyllocladous species, i. 334. 



— rolling of leaf, i. 348. 



Polygonatum verticiUatum, mechanical tissue 



arrangement, i. 730. 

 Polygonum amphibium, leaf-rosette, i. 412, 

 protection of sbomata from moisture, i. 



294. 

 Polygonum Bistorta, effect of mutilation, ii. 



517, 



geitonogamy, ii. 327. 



Polygonum bulbiferum, bulbUs, ii. 454. 

 Polygonum Convolvulus, twining, i. 682, 685. 

 Polygonum Sieboldi, seed-dispersal, ii. 853. 

 Polygonum virginicum, seed-dispersal, ii. 841, 

 Polygoniun viviparum, dispersal of bulbils, 



ii. 454, 819. 



ice-melting, i. 500. 



rolling of leaf, i. 348. 



Polyhedra, of Hydrodictyon, ii. 641. 

 Polypetalse, floral characteristic, ii. 748. 



— of Bentham and Hooker, ii, 604. 

 Polyphagus Euglenae, i. 169; ii. 668. 



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



Polypodiaceae, description, ii. 706. 



— sporangium, ii. 705. 



Polypodium glaucophyUum, wax on fronds, 



i.292. 

 Polypodium serpens, sporogenous frond, ii. 



11. 

 Polypodium vulgare, epiphytic, ii. 705, 

 Polyporese, hymenium, ii. 688. 



— hyphse of, i. 165, 



Polyporus, destructive nature, ii. 688. 



— fossil remains, ii. 614. 

 Polyporus annosus, ii. 688. 

 Polyporus fomentarius, PI. XIV, ii, 688, 

 Polyporus igniarius, ii. 688. 

 Polyporus perennis, ii, 685. 



Polyporus sulfureus, behaviour of mycelium, 

 i, 167. 



cause of mouldering in wood, i. 263. 



Polysiphonia, luminosity, i. 388. 

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

 Polytricbaceae, 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. IB. 



Pomacese, 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. 

 Popiilus, dissemination, i. 614. 



— numerous hybrids, ii, 583, 



— pollination, ii. 133. 



— porogamio 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 Taphrinaaurea, 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 Leelia gracilis, i. 219, 



— dehiscence of poUen-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. 



pollination, ii. 148, 



protogynous, ii, 311. 



Potamogeton fluitans, habit and habitat, ii, 

 502. 



length, i. 388. 



Potamogeton heterophyllus, &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. 



PotentiUa, hybrids, inexhaustible, ii. 585, 



— receptacles and carpels, ii. 76. 



— Marsh. See Comarum palustre. 



— nectary, ii, 174, 



PotentiUa atrosanguinea, autogamy, ii. 381, 

 PotentiUa cinerea, hairs, i. 322. 

 PotentiUa Clusiana, procumbent, i. 662, 

 PotentiUa micrantha, flower, ii. 174, 



nectary concealment, ii. 181. 



PotentiUa nitida, procumbent, i. 662, 

 PotentiUa repens, autogamy, ii. 381, 

 PotentUla reptans, runner, i. 664. 

 Poterium, pollen discharge, ii, 145. 



— protogynous, ii. 313, 



Poterium polygamum, polygamous flower- 

 heads, ii. 294, 

 Pothoideie, climbing 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 poUination, ii. 286, 



— hcterostyly, ii. 302, 



— hybrids, ii. 585. 



— in cultivation, ii. 575, 



— puU of roots, i. 767. 



Primula Auricula and P. CamioHca, 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 poUen 



from wet, ii. 111, 

 Primula Clusiana and Uromyces Primulee 



integrifoliEe, ii. 525. 

 Primula denticulata, protection of poUen 



from wet, ii. 111. 

 Primula elatior and hybridization, ii, 404. 



effect of mutUation, ii. 517. 



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



wax on leaves, i, 291. 



Primula glutinosa, autogamy, ii. 396. 



hybridization, ii. 404. 



sticky fohage, ii, 236, 



Primula hirsuta, prey capturing, i, 155. 

 Primula japoniea, antholysis, ii. 79. 



green flower, ii, 86. 



Primula longifiora, autogamy, ii. 396, 397. 

 Primula minima, autogamy, ii. 396. 

 Primula officinalis, heterostyly and differ- 

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



hybridization, ii. 404. 



Primula sinensis, absorption of ammonia, i. 



65. 

 Primula veris. See P. officinalis. 

 Primulacese, ii, 770, 



— autogamy in, ii, 341, 



— heterostyly in, ii, 302. 



— hybrids among, ii, 585, 



— poUen and probosces of insects, ii. 248. 



— protection of pollen, ii. 118. 



— roUing of leaf, i. 348. 



— variety of venation, i, 635. 

 Privet. See Ligustrum vulgare. 

 Probosces of insects and pollen, ii. 248. 

 Procumbent stem, characteristics, i. 661, 

 Projection of seeds, range of, ii. 839. 

 Prolepsis, doctrine of, i. 8. 



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



— in "Witches' Broom, ii. 527. 

 Promycelium, of Hemibasidii, ii. 675. 

 Pronuba yuccaaella, poUination of Yucca, ii. 



157, 245, 

 Propagation, artificial, from roots, ii, 27. 



— by brood-bodies and fertilization respect- 



ively, ii, 70. 



