458 



PLANT MORPHOLOGY 



Plasnwpnrn, 1 Hi, 117 

 Ploc'tasc-alos, 124 

 Plectostele, 220 

 Plorome, 304, 365, 394, 395 

 Plexrosigtua, 22 

 Plowrightia, 136, 137, 138 

 Plumhagella, embrj'^o sac, 388, 389 

 Plumbago, embryo sac, 388, 389 

 Plumule, 327, 353 

 Podocarpaceae, 340 

 Podosphaera, 127, 128 

 Pollen, grain, Dioon, 328, 329 

 Ephedra. 360 

 Li Hum, 371, 391 

 Pinus, 348 



sac, 379 



tube, Angiospermae, 391 

 Dioon, 328, 329 

 Ephedra. 360 

 Pinus, 348, 349 

 Pollinium, 381 

 Polyembryony, 352 

 Polygonales, 400 

 Polypodiaceae, 278 

 Polypodium, leaflet, 285 

 Polyporaceae, 147 

 Polysiphonia, 89, 91, 92 

 Polysiphonoiis, definition, 67 

 Polijtrichum. 199, 203 

 Porella, 184, 186 

 Porphyra. 86 

 Porphyridium, 87 

 Postelsia, 80 

 Primulales, 404 

 Procarp, Batrachospermum, 90 



Nemalion, 88 



Polysiphonia, 92 

 Proembryo, 326 



Capsella, 395 



Ephedra, 361 



Ginkgo, 339 



Pinus, 351 



Sagittaria, 397 



Zamia, 330 

 Propagule, 69 



Prothallium (see Gametophyte) 

 Protoascales, 122 

 Protococcus, 40, 41 

 Protodiscales, 123 

 Protonema, 161 



moss, 199 

 Protosiphon, 36, 37 

 Protostele, 211, 280 

 Protoxylem, 210 

 Pseudopodium, 196, 198 

 Psilophy tales, 212, 213 



Psilophytinae, orders, 212 



siuninary, '.\Q'.\ 

 Psilophylon, 212 

 Psilopsida, 3, 4, 212 

 Psilotales, 214 



embryo, 217 



gametophyte, 217 



sporangium, 216 



sporophyte, 215 



summary, 217 



vascular anatomy, 215 

 PsHotum, 214 216, 2 17 

 Pteridium, leaflet, 285 



rhizome, 283 



vascular bundle, 284 

 Pteridophyta, classes, 209, 260 

 comparison, 303 



evolutionary tendencies, 416 



gametophyte, 306 



general conclusions, 304 



interrelationships, 307 



sporophyte, 304 



strobilus, 305 



vascular system, 210 

 Pteris, root tip, 279 

 Pteropsida, 4, 260 

 Puccinia, 142-144 

 Puff ban, 152 

 Pylaiella, 68 

 Pyrenoid, 26 

 Pyrenomycetales, 134 



summary, 139 

 Pyronema, 129, 130, 131 

 Pythium, 116 



R 



Radicle, 327, 353 



Ranales, 401 



Ranunculus, floral development, 377 



Raphe, 23 



Reboulia, 165, 166 



air chambers, 162 



air pore, 162 



apical cell, 162 



embryo, 169 



thallus, 162 

 Recapitulation, 414 

 Regnellidium, 293 

 Reproduction, asexual, 417 

 in algae, 96 

 in fungi, 158 



sexual, 418 

 in algae, 96 

 in fungi, 158 

 Reservoir, 15 

 Rhamnales, 403 



