MORPHOLOGY, ANATOMY, AND PHYSIOLOGY. 



8i; 



Potential parasites, 711. 



saprophytes, 711. 

 Prefloration, 59. 

 Prefoliation, 59. 

 Prickle, 60 (Fig. 41). 

 Primary bast, 181. 



bundle, 180. 



differentiation of, 175. 



desmogen, 151, 176. 



cortex, 160, 207, 213. 



members, 15. 



meristem, 145. 



root, 15, 373. 



shoot, 15. 



wood, 176, 180. 

 Primordial cell, 94. 

 Procambium, 151, 176. 

 Procarp, 83, 220, 225, 228, 268 (Figs. 



194, 195). 

 Products of metabolism, 670, 727. 

 Progressive succession, 23. 

 Proliferation, 76. 



Promycelium, 279, 289 (Fig. 200), 305 



(Fig. 215), 307 (Figs. 217, 218). 



Prophyllum, 79, 493, 505 (Figs. 519, 



520). 

 Prosenchyma, 131 (Fig. 90), 132, 190, 



196. 

 Protandrous, 454. 

 Proteids, 707, 720, 724, 727. 

 Proteid crystalloids, 112, 707. 



grains, 112 (Figs. 68-70). 

 Proteolytic enzyme, 680, 724. 

 Prothallium, 372, 375, 397 (Figs. 263- 

 265), 413 (Fig. 270), 423 (Fig. 

 276), 428 (Fig. 278), 448 (Figs. 

 289, 290), 450 (Figs. 291, 292). 

 Protocorm, 421, 424. 

 Protogynous, 454. 

 Protonema, 14, 324 (Fig. 232), 333, 



354, 365 (Fig 249). 

 Protophloem, 167 (Fig. 130), 176. 

 Protoplasm, 4, 89, 93, 95. 



continuity of, 91 (Fig. 45). 



properties of, 6(>7. 

 Protoxylem, 167 (Fig. 130), 176 (Fig. 



135). 

 Pseudaxis, 33, 35, 492. 

 Pseudo-bulb, 44. 

 Pseudocarp, 458, 528. 

 Pseudogamy, 777. 



Pseudo monocotyledonous embryo,445. 

 Pseudo-plasmodium, 283. 

 Pseudopodium, 69, 283. 



of Bryophyta, 328, 357, 362, 364 

 (Fig. 218). 

 Pulvinus, 46, 755, 761. 

 Pycnidium, 75, 278, 296. 

 Pyrenoid, 100 (Figs. 54, 55), 241, 244, 



353. 

 Pyrenin, 06. 



Pyxidium, 531 (Fig. 342), 653. 



Quadrant-wall, 329, 372. 

 Quadrilocular anther, 519. 

 Quincuncial, 60. 

 Quinin, 707- 



Baceme, 490. 



Racemose inflorescences, 490 (Fig. 



309). 

 Radial arrangement, of members, 24 

 (Figs. 11-15). 



longitudinal section, 7. 



of bundles, 175. 



symmetry, 8, 9 (Fig. 2), 507. 

 Radiant umbel, 624. 

 Radicle, 446. 

 Ramenta, 395. 

 Raphe, 437 (Fig. 284). 

 Raphides, 113 (Fig. 72), 729. 

 Rate of growth, 738, 745 (Fig. 480). 

 Receptacle, 76, 85, 268, 325, 357, 494. 

 Receptive spot, 102, 116, 227. 

 Reciprocal hybridisation, 775. 

 Regular flower, 507. 

 Region of elongation, 738, 761. 

 Rejuvenescence of cells, 115 (Fig. 74). 

 Replum, 531 (Fig. 342), 603. 

 Reproduction, 67, 670, 766. 

 Reproductive organs, 67. 



asexual, 70. 



sexual, 79. 



property of protoplasm, 667. 

 Reserve materials, 727. 

 Resin, 709, 728. 

 Resin-ducts, 140 (Fig. 102), 466. 



-sac, 140 (Fig. 104). 

 Respiration, 669, 722, 726. 

 Resupinate, 511, 563. 

 Retardation of growth by light, 674. 

 Reticulate vessels, 104. 

 Retinaculum, 456, 565. 

 Reversion, 779. 

 Rhachis, 76. 

 Rhipidium, 36. 

 Rhizine, 274, 322 (Fig. 229). 

 Rhizogenic cells, 187, 373, 395. 

 Rhizoid, 324, 355. 

 Rhizome, 42 (Fig. 23). 

 Rhizophore, 427. 

 Rib, 51. 



Ricinolein, 708. 

 Ring, 79, 417 (Fig. 272). 

 Rise of temperature in germinating 



seeds, 732 (Fig. 476). 

 Roots, 5, 7, 61 (Fig. 39). 



adventitious, 62, 189. 



aerial, 63, 155 (Fig. 117), 682. 



branching of, 62, 186 (Fig. 142). 



functions of, 680. 



primnry, 62. 



