856 



Plerome, 127. 

 Pleurocarpous Mosses, 319. 

 Plumbagineae, 581. 

 Plumule, 518. 

 Podocarpeae, 460. 

 Podocarpus, 450. 

 Podophyllum, 570. 

 Podostemoneae, 585. 

 Point of insertion, 167. 

 Polarized light, 588. 

 Polemoniaceae, 580. 

 Pollen, Formation of, 14, 15, 



34, 440, 481. 

 Pollen-grain, 23, 203, 423, 



426, 432, 449, 485. 

 Poilen-sac, 426,440,448,482. 

 Pollen-tube, 33, 450, 485, 509. 

 Pollination, 429. 

 Pollinium, 488. 

 Pollinodium, 258. 

 Polycarpae, 554, 579. 

 Polycarpellary, 492. 

 Polycarpic, 519. 

 Polyembryony, 459. 

 Polygala, 535. 

 Polygalacese, 582. 

 Polygamous, 467, 807. 

 Polygonatum, 165, 542. 

 Polygonaceae, 495, 585. 

 Polypodiaceae, 341, 360. 

 Polypodieae, 361. 

 Polysymmetrical, 183, 533. 

 Polytrichum, 333. 

 Pomeae, 584. 

 Pontaderiaceae, 555. 

 Pore-capsule, 539. 

 Porphyreae, 237. 

 Portulacaceae, 583. 

 Posterior, 523. 

 Potamogeton, 548. 

 Potamogetoneae, 554. 

 Potassium, 622. 

 Potato, 59. 

 Pressure, Effect of, on 



growth, 729. 

 Prickle, 85. 

 Primary cortex, 574. 

 Primary meristem, 79, 117. 

 Primary root, 142, 144. 

 Primary tissue, 78. 

 Primary wood, 574. 

 Primine, 501. 

 Primordial cell, 5. 

 Primordial epidermis, 126. 

 Primordial utricle, 42. 

 Primulaceae, 495, 531, 568, 



581. 

 Primulineae, 581. 

 Procambium, 93. 

 Products of degradation, 48, 



628. 

 Pro-embryo, 205, 279, 311, 



432, 434, 458, 513- 

 Pro-embryonic branch, 282. 



INDEX. 



Prolification, 426, 439. 

 Promycelium, 239. 

 Prosenchyma, 78. 

 Protandrous, 812. 

 Proteaceae, 584. 

 Proteine-grains, 51. 

 Proten, 103. 

 Protenchyma, 103. 

 Prothallium, 205, 335, 432. 

 Protogynous, 812. 

 Protomyces, 255. 

 Protonema, 205, 311, 341. 

 Protoplasm, 2, 37. 

 Prototaxites, 226. 

 Pseudaxis, 157, 159. 

 Pseudocarp, 201, 518. 

 Pseudopodia, 318, 329. 

 Psilotum, 406, 411. 

 Psoralea, 113. 

 Pteris, 24, 27, 28, 30, 35, 92, 



96, 105,123,196, 343, 345, 



347, 348, 350, 354- 

 Puccinia, 246. 

 Pulvinus, 783, 786. 

 Punctum vegetationis, 117. 

 Pycnidium, 256, 271. 

 Pyrenomycetes, 256. 

 Pyrola, 493, 557. 

 Pyrolaceae, 581. 

 Pyxidium, 538. 



Quercus, 559. 



Raceme, 520. * 



Racemose branching, 158. 

 Racemose inflorescence, 520. 

 Radicle, 518, 558. 

 Radula, 309. 

 Rafflesiaceae, 557, 579. 

 Ramondieae, 580. 

 Ranunculaceae, 567, 579. 

 Raphe, 427, 501. 

 Raphides, 65, 112. 

 Reaumuriaceae, 582. 

 Receptacle, 239, 249, 426, 



489. 

 Receptive spot, 344. 

 Reciprocal hybrids, 818. 

 Refrangibility, Action of 



rays of diff'erent, 666. 

 Regular flowers, 533. 

 Rejuvenescence of the cell,8. 

 Reproductive cells, 202, 426, 



802. 

 Reseda, 166. 

 Resedaceae, 582. 

 Reserve-materials, 627. 

 Resin-passages, 77, 115, 465. 

 Respiration, 644. 

 Restiaceae, 555. 

 Retardation of growth by 



light, 675, 754. 

 Revolving nutation, 766, 

 Rhamnaceae, 582. 



Rheum, 496, 507. 

 Rhizantheae, 579. 

 Rhizine, 264. 

 Rhizocarpeae, 383. 

 Rhizoid, 211, 282, 317. 

 Rhizome, 196. 

 Rhizophore, 147, 411. 

 Rhizopus, 245. 

 Rhodoraceae, 581. 

 Rhus, 567. 

 Rhodospermine, 51. 

 Ribes, 91. 

 Riccia, 304. 

 Riccieae, 304. 

 Ricinus, 95, 97, 108, 161, 476, 



558, 638. 

 Rivularia, 215. 

 Rivularieae, 215. 

 Roccella, 272. 

 Root, 129, 140. 

 Root-cap, 123, 127, 140. 

 Root-hairs, 139. 

 Root-pressure, 600, 609. 

 Root-sheath, 143. 

 Root-system, 142. 

 Roots, Branching of, 160. 

 Roots, Growth of, 124, 740. 

 Rosa, 200. 

 Rosaceae, 584. 

 Rose-hip, 201, 537. 

 Rosiflorae, 584. 

 Rotation of protoplasm, 39, 



43. 

 Rubiaceae, 566, 581. 

 Rutaceae, 583. 

 Ruteae, 583. 



Sabal, 169. 



Sabina, 451. 



Saccharomyces, 254. 



Sagittaria, 72. 



Salicineae, 582. 



Salisburia, 446. 



Salvia, 814. 



Salvinia, 170, 384, 386, 387, 



390, 391, 394. 

 Samara, 538. 

 Sambucus, 573. 

 Samydaceae, 582. 

 Sanguisorbeae, 585. 

 Santalaceae, 505, 585. 

 Santalum, 507. 

 Sap, 62. 

 Sap-conducting intercellular 



passages, 76, 115, 464. 

 Sap-vesicles, 42. 

 Sapindaceae, 575, 582, 

 Sapotaceae, 581. 

 Saprolegnieae, 242, 805. 

 Saprophytes, 194, 542, 557, 



572, 620, 643, 844. 

 Sarcocarp, 537. 

 Saurureae, 578. 

 Saxifraga, 492. 



