INDEX. 



467 



Nucellus, 103, 104, 356 

 Nucleoli, 48 

 Nucleus, i, 2, 48, 124 

 Nut, 400 

 Nutations, 87, 92 



Oak, 28, 401 



Odors, 379, 384, 400 



Oedogonium, 177, 178 



Oenothera, 27, 43 ; 



Onoclea, 299 



Odgonium, 176 



Oosphere, 176, 248 



Operculum, 271, 272 



Ophioglossales, 284 



Ophioglossum, 285 



Orange, 427 



Orchid order, 389 



Orchidales, 389 



Orchis, 392 



Order, 132 



Oscillatoria, 147 



Osmosis, 45 



Osmunda, 296, 297 



Ovary, 102, 103, 347 



Ovule, 102, 103, 104, 347, 366 



Oxygen, 3, 13, 15, 20 



Palisade mesophyll, 10, 36 

 Pallavicinia, 261 

 Palms, 272 

 Pandanales, 368 

 Pandorina, 159, 160 

 Papaverales, 410 

 Papillae of stigma, 356, 359 

 Papilionaceae, 420 

 Pappus, 453, 454 

 Paraphyses, 188, 275, 276 

 Parasites, 56, 195 

 Parenchyma, n, 64 

 Parmelia, 237 

 Parnassia, 415 

 Pasteur, 145 

 Pea, family, 420 



sweet, 420 

 Peach curl, 209 

 Peat moss, 269 



Pediastrum, 164 

 Penicillium, 196, 206, 209, 210 

 Perennials, 60 



Perianth, 101, 260, 264, 346, 350 

 Periderm, 234, 235 

 Perigynous, 352, 353 

 Perisperm, 365 

 Perisporiales, 212-214 

 Peristome, 277, 278 

 Perithecia, 206, 211 

 Peronospora, 199, 200 

 Peronosporales, 199 

 Petals, 101, 350 

 Petiole, 7, 8 

 Peziza, 218 

 Pezizales, 219 

 'Phaeophyceae, 181 

 Phallales, 236 

 Phallus, 236 



Phloem, 52, 64, 65, 66, 67 

 Phosphorescence, 299 

 Phlox order, 442 

 Photosynthesis, n 

 Phycomycetes, 197 

 Phyllactinia, 214 

 Phylloglossum, 312 

 Phytophthora, 199, 200 

 Picea, 343 

 Pierce, 170 

 Pileus, 229, 230 

 Finales, 330 



classification of, 343 

 Pine, 331, 333, 334, 336 

 Pinguicula, 448 

 Pinnularia, 150, 153 

 Pistil, 102, 366 

 Pith, 64 

 Placenta, 355 

 Plankton, 148 

 Planktoniella, 150 

 Plant, nature of, I 



cell, i 



Plasmodium, 136, 137 

 Plasmopara, 200, 201 

 Plastids, 2, 17 

 Pleurococcus, 162 

 Plowrightia, 215 



