726 



INDEX 



Solenostele, 190 ; in Ferns, 647. 



Somatic expansion, 77. 



Soral state in Ferns, 633. 



Sorus, a sporangiophore, 151 ; fission of, 

 633 ; primitive position of, 633 ; shifting 

 of position of, 636 ; extension of, in 

 Ferns, 699. 



Speculative morphology, 6. 



Spencerites, 146 (Fig. 76) ; insignis, 321 

 (Fig. 167). 



:Spermatozoids, fertilisation by, 2, 244. 



Sphaerocarpus % 92, 263. 



Sphaeropteris, 617. 



Sphagnales, 272. 



Sphagnum, 93 (Fig. 48), 272 (Fig. 132). 



Sphenophylhtm, vegetative system, 399 ; 

 anatomy, 400; strobilus, 401. 



Sphenophyllales, 398 ; summary for, 423. 



Sphenophylleae, 230, 398. 



.Sphenophyllum cuneifolium, 400 (Fig. 216) 

 \ = S. Dawsoni), 402, 425 (Fig. 219); 

 S, tenerrimtim, 400 (Fig. 216) ; S. verti- 

 cillatum, 400 (Fig. 216) ; majus, 147 

 (Fig. 78); insigne, 400 (Fig. 217); S. 

 .trichomatosum, 402 (Fig. 218); S. angusti- 

 folittm, 402 ; tenerrimum, 402 ; Romeri, 

 402, 425 (Fig. 220) ; majus, 402, 424 

 (Figs. 221, 222) ; fertile, 404. 



.Splachnum, 281 (Fig. 138) ; luteum, 203 

 (Fig. 102). 



-Sporangia, 693 ; positions of, 694 (Fig. 360) ; 

 increase and decrease of, 86 ; uniformity 

 of dimensions of, '114; indefiniteness of 

 number, 115; relation to axis, 115; in- 

 dividual identity of, 117; simultaneous 

 or successive, 117; variations in number 

 -of, 119, 129, 249; increase in number of, 

 120, 249 ; decrease in number of, 120, 249; 

 septation of, 120, 249; interpolation of, 

 1 20, 121, 249 ; interpolation restricted to 

 certain groups, 130; fusion of, 120, 126, 

 130, 249 ; abortion of, 120, 127, 161, 249. 



..Sporangiophore, 144, 250, 693 ; of Tmesip- 

 teris, 409, 410, 414 ; of Psilotum, 412, 

 416 ; number of sporangia, 425 ; position, 

 425 ; development, 426 ; a part sui generis, 

 153, 426; amplification of, 699; positions of, 

 694 (Fig. 360); of Helminthostachys, origin 

 of, 455 (Figs. 254, 255) ; of Eqitisetum, 

 37i, 377, 379; morphology of, 382. 



.Sporangiophoric Pteridophytes, 366 ; sum- 

 mary for, 423 ; a brush of related phyletic 

 lines, 712-714. 



Sporangium defined, 103, 1 12; individuality 

 of, no; septation of, no; of Ferns, 

 segmentation of, 637 (Fig. 349) ; stalk of, 

 638 ; head of, 638 ; annulus of, 638 ; pluri- 

 seriate annulus, 639 ; contents of, 641 ; 

 succession of, 644 ; of Filicales, 637. 



Sporangiogenic band, 447, 449 (Figs. 247, 

 248). 



Spore-enumerations, 641 ; variation in num- 

 ber in near affinities, 643 ; in Botryopteri- 

 deae, 502; in Marattiaceae, 516, 520; in 

 Osmundaceae, 536 ; in Schizaeaceae, 547. 



Spore-output of Male Fern, 23. 



Spore-producing members, 693 ; of Filicales, 

 632. 



Spore-production a constantly recurring 

 event, 9. 



Spores, dispersal of, 645 ; in Simplices, 645 ; 

 in Gradatae, 646 (Fig. 350) ; in Mixtae, 

 646. 



Sporogonia, symmetry of, 203 ; of Mosses, 

 general comparison of, 285. 



Sporogenous group, 87 ; tissue, segregation 

 of, 85 ; hypodermal origin of, 109 ; not 

 strictly circumscribed, 112; time of dis- 

 tinctive development, 116; disintegration 

 of, 142. 



Sporophyll converted to foliage leaf (Goebel), 

 171 ; of Tmesipteris, 409, 410, 414 ; of 

 Psilotum, 411, 416. 



Sporophyte, 32. 



Sporophytic budding, 20, 61. 



Sporophylls, 144. 



Spross-glied-lehre of Celakovsky, 135. 



Stachannularia, 377- 



Stauropteris oldhaniia spores germinate in 

 sporangium, 497, 498 (Fig. 271), 501. 



Stigmarian trunks, 220 (Fig. 112); 302 

 (Fig. 150). 



Stegocarpae, 277. 



Stelar theory, 189. 



Stele, 189 ; non-medullated monostele pri- 

 mitive, 685 ; medullation, 687 ; disinte- 

 gration, 687 ; xylem-sponge of Lycopods, 

 688 ; intrusion of outer tissues leads to 

 solenostele, 688 ; of Lycopods, 328 ; of 

 Selaginella, 332 (Fig. 173); of Lepidoden- 

 dron, 333 (Fig. 174). 



Stem-apex of Angiopteris and Osmunda, 650 

 (Fig. 352). 



Sterile and fertile regions, their relations, 

 156, 251. 



Sterile region secondary, 161. 



