724 



INDEX 



Ophioglossum, external characters, 431 ; 

 spore-producing members, 447 ; spore- 

 mother-cells, 451 (Figs. 250, 251); ana- 

 tomy, 458 (Figs. 256, 258, 259) ; embryo, 

 466 (Fig. 260); prothallus, 464; crotalo- 

 phoroides, 431 ; opacuin, 431 ; vtilgatum, 

 431 (Fig. 235); Bergiamim, 433; bulbo- 

 sum, 433 ; nudicaule, 433 ; lusitanicum, 

 423 ; pendulum, 435 ; palinatuin, 435 

 (Figs. 238, 239) ; simplex, 441 ; inter- 

 medium, 441 ; reticulatnin, 439, 448 (Fig. 

 246); 451 (Fig. 250). 



Orientation of embryo variable, 666. 



Origin of members as new structures, 659 ; 

 objections answered, 680. 



Osmwtda, 530 (Fig. 293) ; sporangia of, 

 53 2 > 535 (Figs. 296 bis, 296) ; anatomy 

 of, 536 (Figs. 298, 299) ; embryology of, 

 540 ; reduced leaves of, 239 ; regalis and 

 javanica, 169 (Fig. 90). 



Osmundaceae, external characters, 530 (Fig. 

 2 93) ; spore-producing members, 533 ; 

 anatomy, 536 ; embryology, 540 ; phyletic 

 position of, 654 (Fig. 354). 



OsmunditeS) 539. 



Overtopping, 135, 136. 



Pachytheca, 228. 



Palaeophytology, evidence of, 227 ; its 

 limitations, 229. 



Palaeopteris .hibernica, 582. 



Palaeostachya, 150 (Fig. .81); vera, 375 

 (Fig. 203) ; morphology of cone, 384 

 footnote. 



Parts, independent origin of, 183. 



Pecopteris, 528; (Dicksonites) Phickeneti, 

 528; dentata, 519 (Fig. 287); unita, 520. 



Pellia, 266 (Fig. 128). 



Periblem, 178. 



Periodic reduction, 84. 



Peronospora, 68. 



Phascum, 282 (Fig, 139). 



Phragmidium, 69. 



Phyllanthus, 126. 



Phylloglossum, 297 (Figs. 145, 146) ; spor- 

 angium of, 315 ; embryology of, 352, 355 

 (Fig. 189) ; detached leaf-traces, 199 ; 

 protoconn of, 225. 



Phylloids (Lignier), 136. 



Phyllopodium, 629. 



Phyllosiphonic structure, 139, 198; state, 

 may be derived from cladosiphonic, 487-8; 

 secondary, 648. 



Phyllotheca, 150, 167, 372 (Fig. 197), 384. 

 Phylogeny of Filicales, 652. 

 Physcomitrella patens, 36 (Fig. 20). 

 Physcomitrium , 280 (Fig. 137). 

 Physiological experiment, 6 ; a check on 



phyletic speculation, 236. 

 Phy tonic theory, anatomical aspect of, 188 ; 



of Delpino, 135. 



Picea exceha, ovule of, 41 (Fig. 27). 

 Pilularia, 551. 



Pinakodendron musivum, 304. 

 Pinus Laricio, germination of pollen, 42 



(Fig. 28). 

 Platycerium, 631. 

 Platyzoma, 553. 

 Plerome, 178. 

 Pleitromoia, 220 (Fig. 114), 302 (Fig. 151); 



strobilus of, 304 (Fig. 154). 

 Podostemaceae, symmetry of, 201. 

 Polarity. 203 ; of embryo variable, 666 ; 



inversion of, 675. 

 Pollen-mother-cells, 49 (Fig. 32). 

 Polygomun, ovary of, 44 (Fig. 30). 

 Polyphyletic development, n. 

 Poly podium, 628 ; phyletic position of, 656 



(Fig. 354) ; punctatum, 616; vulgare, 23, 



28, 214 (Figs. 7, 12, no); symmetry of 



seedling, 214 (Fig. no). 

 Polysiphonia, 67, 81. 

 Polysporangiate state, 113. 

 Polystelic type, 189. 

 Polystichum angulare, v. pulcherriiiniiu ; 



apospory in, 55 (Fig. 37). 

 Polytrichaceae, stem-structure, 195-6. 

 Polytrich urn, 281. 

 Porella, 265 (Fig. 126). 

 Precocity of cotyledon, 670, 671 ; of root, 



672. 



Primitive shoot, 716. 

 Progressive metamorphosis of Goethe, 157, 



251. 



Prohepatic type of Lignier, 137, 216. 

 Prothalli of Lycopodium, 340 ; saprophytic, 



342 ; subterranean, 343. 

 Prothallus of Fern, 25. 

 Protocalamariaceae, 373. 

 Protoconn, 181, 223, 253, 672 ; in Phanero- 

 gams, 224; of Lycopods, 351. 

 Protostelic state in primitive Ferns, 647. 

 Protoxylem, peripheral in Lycopodinm, 328; 



central in Selaginella, 332. 

 Psaronius, 507, 526, 528. 

 Pseudobornia, 373, 424. 





