Pisum, 305, 308, 369 
Pithophora, 334 
Pitted vessels, 36 
Pittosporaceae, 369 
Planera, 362 
Plant Breeding, 115 
Cell, 4 
Plantaginaceae, 365 
Plantago, 323, 365 
Plantains, 365 
Plasmolysis, 72 
Plasmopara, 187, 335 
Plasticity of Plant body, 319 
Plastids, 2, 10 
Platanaceae, 369 
Platanthera, 361 
Platanus, 369 
Pleosporaceae, 343 
Plerome, 44 
Pleurocarpi, 252, 351 
Pleuromoiaceae, 354 
Pleurophascaceae, 351 
Plocamium, 209, 339 
Plowrightia, 219, 343 
Plum, 308 
Plumbaginaceae, 365 
Plum-pocket Fungus, 218 
Plums, 368 
Plumule, 305 
Poa, 300 
Poaceae, 297, 359 
Pocket Fungi, 341 
Podaxaceae, 345 
Podaxon, 345 
Podocarpaceae, 356 
Podocarpus, 356 
Podosphaera, 225, 344 
Podostemonaceae, 364 
Pogonatum, 351 
Poisons, 96 
Polar nuclei, 287 
Polemoniaceae, 366 
Polemoniales, 366 
Polemonium, 366° 
Pollen, 273 
-cells, 284 
-sacs, 286 
tube, 279, 287 
Pollination, 280, 321 
Polygalaceae, 363 
Polygonaceae, 365 
INDEX 
Polygonum, 365 
Polypodiaceae, 258, 353 
Polypodium, 258, 353 
Polypody, 258 
Polyporaceae, 230, 345 
Polypores, 232, 345 
Polyporus, 346 
Polysaccharids, 147 
Polysiphonia, 208, 339 
Polystictus, 346 
Polytrichaceae, 252, 351 
Polytrichum, 351 
Pond Scums, 178, 333 
Pontederiaceae, 358 
Poppies, 364 
Populus, 364 
Pore Fungi, 230 
Porphyra, 207, 338 
Portulaca, 364 
Portulacaceae, 364 
Postelsia, 201, 337 
Potamogeton, 357 
Potamogetonaceae, 357 
Potato, 320 
Potentilla, 291, 368 
Pothos, 296, 300 
Pottia, 350 
Pottiaceae, 350 
Powdery Mildews, 220 
Prasiola, 332 
Prasiolaceae, 332 
Prickly Fungi, 230, 346 
Pear, 310 
Primary leaves, 281 
Primrose, 303, 365 
Primula, 303, 304, 323, 365 
Primulaceae, 365 
Primulales, 365 
Prinodontaceae, 351 
Promycelium, 234 
Propagation, 171 
Propolis, 341 
Propyl, 142 
Proteaceae, 372 
Proteins, 87, 150 
Proterandrous, 323 
Proterogynous, 323 
Prothallium, 254 
Protocalamariaceae, 353 
Protocaliciaceae, 341 
Protococcaceae, 332 
401 
