414 



METHODS IN PLANT HISTOLOGY 



Paraffin, 40; bath, 11, 13, 41, 118; 



method, 112; used, 119; cakes, 121; 



removal, 129; sections, schedule, 131 

 Parmelia, 265 

 Parthenogenesis, 317, 370 

 Pediaslrum, 105, S£7 

 Peels, 157 



Pelargonium, 347, 348 

 Pellia, 277, 278, 282, 283 

 Peltigera, 265 

 Penicillium, 104, 262 

 Peroxide of hydrogen, 27 » 

 Petrotome, 154 

 Peziza, 259 

 Phaeophyceae, 240 

 Phloroglucin, 86 



Phloxine, 61; and anilin blue, 69, 110 

 Photographic formulas, 181 

 Photomicrographs, 171; movie, 177 

 Phycomyces, 255 

 Phyllactinia, 262 

 Physcia, 265 

 Phytelephas, 146 

 Phytophthora, 273 

 Picea nigra, root, 337 

 Picric acid, 29 

 Picro-carmine, 29 

 Pilularia, 318 



Pinus, 333; P. laricio, 333, 342, 343; 

 P. marilima, 333; P. strohus, wood 

 sections, 334, 336; P. edulis, em- 

 bryo, 337; oogenesis, 341; P. con- 

 torta, sporangium, 341; gameto- 

 phyte, 342; ventral canal cell, 343; 

 P. banksiana, 345 



Pipette, 16 



Pistia straliotes, 352 



Plasmodia, 199, 200 



Plasmodiophora, 272 



Pleurococcus, 229 



Plocamium, 248 



Plumbagella, 366 



Podocarpus, 340 



Podophyllum, root-tips, 349; reduction 



of chromosomes, 351 

 Podosphaera, 262 

 Polyporus, 271 

 Polysiphonia, 32, 247, 250 



Polytrichum, 286 



Porella, 279 



Porphyra, 248 



Postelsia, 241 



Potassium chlorate, 27 



Potassium hydrate, 152 



Potassium permanganate, 57, 62, 313 



Power's method for Volvocales, 217 



Preissia, 275, 278 



Protein, 83 



Prothallia, of ferns, 312, 313, 314, 315; 



Costello's method of growing, 316 

 Protonema, of mosses, 285 

 Protoplasmic connections, 5, 146, 148 

 Primus, floral development, 356 

 Pseudoborniales, 292 

 Psilotales, 292 

 Pteridophytes — -Lycopodiales, 292 



Lycopodium, 292 



Vegetative structure, 292 

 Strobilus, 294 

 Gametophytes, 294 

 Archegonia and antheridia, 295 



Selagindla, 296 



Vegetative structure, 296 

 Strobilus. 296 

 Gametophytes, 298 



Isoetes, 298 



Vegetative structure, 299 



Sporangia, 299 



Gametophytes, 299 



Monograph, 298; sporelings, 298; 

 megaspores, 298 

 — Equisetales, 300 

 Equisetum, 300 



Vegetative structure, 300 



Strobilus, 301 



Gametophytes, 302, 303 



FlLICALES, 304 



Vegetative structure, 304 

 Sporangia, 310 

 Prothallia, 312 

 Embryos, 317 



Pteris aquilina, 88, 305, 306, 314; P- 

 longifolia, 315; P. cretica, partheno- 

 genesis, 317 



Ptilidium, 277 



Puccinia graminis, 266, 267, 270 



Puccinia xanlhii, 268 



Pyoktanin, 147 



Pyrenoid, 49 



