808 



INDEX 



Propagule, vegetative, 400 



Prophase, 446 



Protein, 103, 106, 141, 146, 169, 175; 

 accumulation, 145, 148; digestion, 144; 

 molecules, 141, 144, 522; synthesis, 

 141-145 



Proterozoic, 723, 727 



Prothallus, 664, 665, 675, 685 



Protonmea, 645, 649 



Protons, 96 



Protoplasm, 59, 60, 62, 145. 169; stream- 

 ing of, 197 



Pseudopodium. 649, 650 



Psilophytes, 727 



Psilophyton, 728 



Psilotum, 728 



Pteridophytes, 656-676 



Puccinia, 559, 560 



Puffballs, 542, 555 



Pulvinus, 88, 90 



Pure-line plants, 432 



"Purposeful behavior," 50-58 



Pustules, 573 



Pycnia, 560 



Pyxis, 366 



Quillworts, 673 



Raceme. 360, 361 



Rachis, 21, 659 



Radicle, 294 



Rafflesia, 15, 16 



Ranunculaceae, 706 



Ray, light, 115, 116; phloem, 264, 268; 



vascular, 264; xylem, 264 

 Receptacle, 353, 633 

 Recessiveness, 456, 459 

 Red snow. Frontispiece 

 Redi, 526, 528 

 Reduction, 98. 110, 138, 156; division, 



448, 450 

 Redwoods. 401, 778, 779 

 Reindeer lichen, 563 

 Reproduction, asexual, 545, 549, 617, 



647; sexual, 371-386, 400, 617, 646 

 Reproductive organs of plants. 11 

 Research, plant, 3 

 Resin, 169, 172; ducts, 282. 289; method 



of tapping, 172 

 Respiration. 149-159; accessory features, 



157; aerobic. 157; anaerobic, 157; and 



CO2, 153, 165; and photosynthesis, 

 152, 154, 163; and plant development. 

 160-166; comparative rates of, 165; 

 demonstration of, 149, 155; essential 

 features of, 157; external evidence for, 

 151; factors affecting, 160 

 Respiratory ratios, 154 

 Resurrection plant, 670 

 Reversible reactions, 130, 133, 144 

 Rhizoids, 545, 651 

 Rhizomes, 187, 256, 257, 404, 405, 407, 



411 

 Rhizopus, 545 

 Rhodophyceae, 608 

 Rhynia, 728 

 Riccia, 652 

 Rind, 292 

 Ringworm, 557 

 Rivers and streams, 596 

 Rock tripe, 564 



Root cap, 13, 295, 303; hairs, 13, 303, 

 313; pressure, 322; primordium, 294, 

 415; sections, 302, 304; structure, 300; 

 surfaces, 312; systems, 295, 300, 306, 

 311, 313, 325; tip, 10, 303 

 Root-parasite, 16 

 Root-shoot growth, 192 

 Roots, 10, 294-314, 315-332; adventitious, 

 295; aerial, 119, 297, 299; dependence 

 on leaves, 191; fibrous, 296; growth of, 

 304, 305, 307, 308; herbaceous, 296; 

 in dry soil, 308; lateral, 13, 295; of 

 arbor vitae, 311; of bald cypress, 310; 

 of beet, 306; of carrot, 317, 320; of 

 Cissus, 415; of hemlock and spruce, 

 307; of white pine, 318; primary, 10, 

 11, 294; processes in, 315; prop, 297, 

 298, 299; secondary, 11, 295, 313; tap, 

 13, 296; tertiary, 295, 313; tissues of, 

 302, 303; types of, 294 

 Rosaceae, 707 



Rose family, 707; flower, 707 

 Rosettes, 33, 81, 258, 670; winter, 33 

 Rots, 574, 578, 580 

 Rubber, 173; plantation, 173 

 Rubiaceae, 714 

 Runners, 256, 402 

 Rushes, 697; scouring, -673 

 Rust, 558; apple, 562; cedar, 562; wheat 

 stem, 559. 560; white pine blister, 562 



