402 
Protococcoideae, 171, 332 
Protococcus, 171, 332 
Protomycetaceae, 344 
Protonema, 247 
Protopityeae, 354 
Protoplasm, 1, 151 
Protoplasmic movements, 110 
Protosiphon, 192, 336 
Prunaceae, 368 
Prunus, 308, 368 
Psalliota, 345 
Pseudomonas, 331 
Pseudotsuga, 281 
Psilotaceae, 354 
Ptelea, 363 
Pteridium, 259, 353 
Pteridophyta, 254, 352 
Pteridosperm, 272 
Pteridospermales, 354 
Pteridospermeae, 272, 354 
Ptilota, 339 
Ptychomniaceae, 351 
Puccinia, 232, 347 
Puff-balls, 227, 345 
Punicaceae, 369 
Purslane, 326 
Pycnia, 233 
Pycnidia, 239 
Pyeniospores, 233 
Pyrenidiaceae, 343 
Pyrenoids, 11 
Pyrenolichenes, 218, 342 
Pyrenomycetales, 218, 343 
Pyrenopsidaceae, 340 
Pyrenothamniaceae, 343 
Pyrenulaceae, 343 
Pyronema, 217, 342 
Pyronemataceae, 342 
Pythiaceae, 335 
Q 
Quercus, 310, 311, 372 
Quiinaceae, 363 
Quillworts, 258, 352 
Quince, 313 
Quinine, 150 
R. 
Radial bundles, 56 
Radish, 306 
Radishes, 320 
INDEX 
Raffinose, 146 
Rafflesiaceae, 370 
Ragweeds, 375 
Ralfsiaceae, 337 
Ramalina, 216, 340 
Ramularia, 239, 348 
Ranales, 361 
Ranunculaceae, 361 
Ranunculus, 274, 286, 361 
Rapateaceae, 358 
Raphanus, 306, 364 
Raphe, 181 
Raphids, 15 
Ray flowers, 312 
Razoumofskya, 371 
Receptacles, 246 
Receptacular cup, 286 
Red Algae, 205, 338 
-rust, 233 
Seaweeds, 338 
Snow plant, 172 
-top Grasses, 359 
Reductase, 153 
Reduction Division, 111 
Redwoods, 278 
Regular flowers, 322 
Rejuvenescence, 181 
Relationship, 157 
Reproduction, 109 
Resedaceae, 364 
Respiration, 90 
. Resting spore, 174 
Restionaceae, 358 
Reticulated veins, 257 
vessels, 36 
Rhabdonema, 334, 339 
Rhacopilaceae, 351 
Rhamnaceae, 371 
Rhamnus, 371 
Rhegmatodontaceae, 351 
Rheum, 365 
Rhipsalis, 370 
Rhizina, 342 
Rhizinaceae, 342 
Rhiziphyllidaceae, 338 
Rhizoids, 244 
Rhizogoniaceae, 350 
Rhizophoraceae, 370 
Rhizopogon, 344 
Rhizopus, 335 
Rhodobacteria, 331 
