486 



INDEX 



Protoplasm, nature of, 2, 3 



Protoplasmic connection of cells, 3 



Pruning, 94 



Prunus, 436 



Pteridophyta, 297 



Pteridium, 314 



Ptomaines, 152 



Puccinia, 233, 234 



Puff ball, 247, 248 



Pulvinus, 33 



Pustules, 239, 240 



Pycnium, 234, 233 



Pycnidium, pycnidia, 233, 234 



Pycnidiospores, 233 



Pyrenoids, 174, 175 



Pyrola, 368, 455, 456 



Pyronema, 230, 231 



Quarter-sawed oak, 90 

 Quercus, 367, 416, 419 



Ragweed family, 476 

 Ranales, 423, 425 

 Ranunculus, 423, 424 

 Ray, flower, 474 



medullary, 87, 88 

 Rattlebox, yellow, 464, 465 

 Receptacle, 365-370, 423 

 Red algae, 163, 199-204 

 Red snow, 166 

 Respiration, 20, 49 

 Reproduction, 108, 131 

 Resin, 350 



Resurrection plant, 331 

 Rhamnales, 446 

 Rhinanthus, 464, 465 

 Rhizoids, 255, 269 

 Rhizomes, 104, 105, 320 

 Rhizopus, 212, 213 

 Rhododendron, leaf, 39 

 Rhodophyceae, 199, 200 

 Rhus, 444, 445 

 Ribes, 434 

 Riccia, 258 



Ricciocarpus, 258, 259, 267 

 Richards, 70 

 Ring, annual, 86, 87 

 Rivularia, 156 

 Root, I, 4, 45, 279, 298 



anchoring and supporting, 64 



bacteria on, 61 



cap, 53, 54. 382 



contraction of, 64 



hairs, 45, 46 



Root, lateral, 57 



modification of, 59 

 sensitiveness of, 57 

 storage organs of, 63 

 structure of. 51, 52, 54, 55 

 surface of, 51 



Rootstock, 104 



Rosales, 432 



Rosette, 28 



Rose order, 432 



Rostellum, 409 



Rubiales, 467 



Rush, 385 



Rusts, 232 



white, 208 



Saccharomycetes, 216 



Sac fungi, 216-232 



Sage, 462 



Salicales, 414 



Salix, 365, 415 



Salvia, 462 



Samara, 383, 444 



Sambucus, 467 



Sanguinaria, 427 



Sap, 3, 54, 66, ^^ 



Sapindales, 441 



Saprolegnia, 206, 207 



Saprolegniales, 206 



Saprophytes, 145, 224 



Sapwood, 90 



Sargassum, 195 



Saxifrage, 371, 434 



Scabiosa, 468 



Scenedesmus, 171 



Schizocarp, 443, 444 



Schizophyta, 147 



Scitaminales, 405 



Sclerenchyma, "j^) 



Sclerotium, 228 



Scouring rush, 321 



Scrophulariaceae, 463 



Scutellaria, 462 



Scutellum, 128, 129, 394 



Secondary growth, 80 



Sedge order, 390 



Seduni, 109, 363, 432, 433 



Seed, 337, 345, 357, 381 



development of, 118, 119 

 growth of, 120, 124 



Seedling, castor bean, 126 

 corn, 128 



Seed plant, 337 



Selaginella, 331, 332, 334 



