INDEX 



721 



sporangium, development of, 22; spoiv- 

 mother-cells of, 23 ; spore tetrads of, 23 ; 

 sexual organs of, 27 ; anlheridium of, 27 ; 

 spermatozoids of, 28 ; archegonium of, 28 ; 

 fertilisation of, 29 ; embryo of, 30, 31 ; 

 life cycle of, 32 (Fig. 16). 



Fern leaf, origin of, 630, 631 ; differentiation 

 of, 631. 



Ferns, resistance to drought, 18 ; vegetative 

 propagation of, 19. 



Fern spores, dispersion of, 24. 



Fertile and sterile regions, their relations, 

 156, 251. 



Fertile spike of Ophioglossaceae, general 

 morphology of, 432-447, 480 ; development 

 of, 447, etc. 



Filicales, 495 ; general comparison of, 624 ; 

 external characters of, 625 ; spore-pro- 

 ducing members of, 632 ; sporangium of, 

 637 ; anatomy of, 646 ; embryology of; 

 649 ; phylogeny of, 652 ; essentially 

 strobiloid, 657 ; of strobiloid origin, 715. 



Filmy Ferns, classification of, 585 ; structural 

 specialisation of, 586 ; reduction of spor- 

 angia of, 587. 



Fission of spike in Ophioglossaceae, 479. 



Florideae, 67. 



Flower, symmetry of, 207. 



Foliar trace, disintegration of, 668. 



Foot, 672 ; intra-prothallial of Lycopodiuin. 

 225 ; in Lycopods, 348 ; in Selaginella, 



356. 



Formative regions of Hanstein, 178. 

 Free-living sporophyte, establishment of, 21 8. 

 Fntllania, 264 (Fig. 124). 

 Fuciis, 66. 

 Fiut aria, 278 (Figs. 136, 137) ; symmetry 



of, 204 (Fig. 103) ; hygrometrica t 91. 

 Fungi, alternation in, 68. 



Gametophyte, 32. 



Gametophytic budding, 27, 6 1. 



General comparison of Filicales, 624. 



Geographical distribution, 5. 



Geot/ial/itx, 263. 



Germinal layers, theory of, 175. 



Germs, distribution of, I. 



Gleicheniaceae, phyletic position of, 654 

 (Fig. 354); external characters, 5535 spore- 

 producing members, 555 : anatomy, 561 ; 

 spore-enumerations, 559. 



Glcichenia, 553; < in inata, 555 (Fig. 310), 

 557 5 spore-enumerations, 559 ; di<\trpa 



(Fig. 98) ; anatomy, 563 (Fig. 314) : di 

 toma (Figs. 63, 64), 554 (Fig. 310), 557 

 (Fig. 311); anatomy, 561 (Fig. 313): 

 circinata (Figs. 63, 64); Jlabellala (Fig. 

 64), 554 (Fig. 309), 557 (Fig. 311); 

 anatomy, 561 (Fig. 313) ; a centri! 

 type, 564; p,'i-tinata, 554; anatomy, 561 



(Fig- 3I3)- 

 Glossopteris, 625. 



Gradatae, 117,497,498,470,634; transition 



to Mixtae, 602. 

 Grammatopteris Rigolloti, 498 (Fig. 269), 



501, 532, 539. 

 Gnetuni gncinon, 97. 

 Giinucra, polystely, 192. 

 Gymnosperms, early existence of, 228. 

 Gymnosporangium, 69. 



Hairs of Ferns, 632. 

 Haploid phase, 48, 52. 

 Hawlea Miltoni, 522 (Fig. 289). 

 Haustoria, 181, 672. 

 Haustorium, intra-prothallial, 347. 

 Helmintkostachys, 151 (Fig. 83), 443 (Hg.-. 



243, 244) ; external characters, 443 (Fig-. 



243, 244) ; spore-producing members, 455 



(Figs. 254, 255) ; anatomy, 458, etc. (Fig. 



256) ; embryo, 473 (Fig. 267). 

 Hepaticae, 257. 

 Heterosporous condition, '114. 

 Heterospory, 703, 716 ; in Seiaginella, 317 ; 



in Isoclcs, 318; in Lepidoslrobits, 324; in 



Calamostachys, 38 1 . 

 Hippuris, 178. 

 Hofmeister'sVergleichendeUntersuchungen, 



14, 33- 



Homogeny, 76. 



Homologous alternation, 76, 79. 



Homologous theory of alteration, 47. 



Homosporous condition, 1 13 ; ferns in I'alaen- 

 zoic period, 497. 



Horsetails, 366. 



Hydrodiityon, 64. 



I [ymenophyllaceiie, phyletic position of, (154 

 (Fig. 354) ; external characters, 575 (I 

 322, 323); spore-producing member-, 576 

 (Figs. 324, 327) ; anatomy, 5X2 (Fig. 3-iSi : 

 classification, 585- 



llymcnophyllilcs ifrliiatiilns, 582: 1 1 \issif, 

 582. 



Hymenophyllum, habit, 575 (Fig. 322); 

 sorus, 579 (Fig. 324 fit's); sporangia, 579 

 i Mg. 325); spore-enumerations, 580; 



2 Z 



