400 : 
Penium, 333 
Pentaphyllaceae, 371 
Pentstemon, 306 
Peppermint oil, 144 
Pepsins, 153 
Perianth, 274, 284 
Periblem, 44 
Pericarp, 175, 208 
Peridium, 228 
Perisporiaceae, 344 
Perisporiales, 220, 343 
Peristome, 252 
Perithecia, 215 
Peronospora, 188, 335 
Peronosporaceae, 187, 335 
Peronosporales, 335 
Peroxidases, 153 
Perseite, 142 
Pertusaria, 340 
Pertusariaceae, 340 
Pestalozzia, 348 
Petals, 286 
Petticoat Mosses, 252 
Petunia, 304, 366 
Peziza, 216, 342 
Pezizaceae, 342 
Pezizales, 216, 341 
Phacelia, 366 
Phacidiaceae, 341 
Phacidiales, 341 
Phacidium, 341 
Phaeophyceae, 199, 366 
Phaeosporeae, 336 
Phalarideae, 359 
Phalaris, 359 
Phallaceae, 345 
Phallales, 228, 345 
Phascum, 350 
Phaseolus, 314, 369 
Phellonie acid, 155 
Philadelphus, 369 
Philydraceae, 358 
Phloem, 55 
Phloeonic acid, 155 
Phlox, 304, 366 
Phoenix, 358 
Phoradendron, 371 
Phosphorie acid, 139 
Photonasty, 124 
Photosynthesis, 84 
Phototaxy, 119 
INDEX | 
Phototropism, 124 
Phragmidium, 235, 347 
Phrymaceae, 367 
Phycobacteriaceae, 331 
Phycocyanin, 156, 163, 205 
Phycoerythrin, 156, 205 
Phycomyceteae, 185, 335 
Phycophaein, 156, 199 
Phyla, 159, 327 
Phylogeny, 114, 157 
Phylogeny of Fungi, 240 
Phyllachora, 343 
Phyllactinia, 225 
Phyllocladaceae, 356 
Phyllocladus, 356 
Phyllopsoraceae, 340 
Phyllopyreniaceae, 343 
Phyllosiphon, 334 
Phyllosiphonaceae, 334 
Phyllosticta, 239, 347 
Physalis, 366 
Physcia, 216, 341 
Physciaceae, 341 
Physcomitrium, 350 
‘“Physiological Diseases,”’ 134 
Physiology, 71 
Physma, 340 
Phytolaccaceae, 364 
Phytophthora, 188, 335 
Picea, 281, 356 
Pigments, 155 
Pigweeds, 326 
Pilacraceae, 346 
Pilobolus, 335 
Pilocarpaceae, 340 
Pilotrichaceae, 351 
Pilularia, 353 
Pimenta, 370 
Pinene, 144 
Pines, 281, 356 
Pinks, 303, 364 
Pinoideae, 355 
Pinus, 279, 281, 356 
Piperaceae, 361 
Piperin, 149 
Piptocephalidaceae, 335 
Piptocephalis, 335 
Pirolaceae, 365 
Pirus, 313, 368 
Pistillaria, 346 
Pistils, 284 
a 
a 
