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. 



Spenit'rites, 146 (Fig. 76) ; insignis, 321 

 (Fig. 167). 



Spermatozoids, fertilisation by, 2, 244. 



Sphaerocarpits, 92, 263. 



Sphaeropteris, 617. 



Sphagnales, 272. 



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



Sphcnophyllum, vegetative system, 399 ; 

 anatomy, 400; strobilus, 401. 



Sphenophyllales, 398 ; summary for, 423. 



Sphenophylleae, 230, 398. 



Sphenophyllum inncifolimn, 400 (Fig. 216) 

 ( S. Dawsoni], 402, 425 (Fig. 219); 

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

 cillatitm, 400 (Fig. 216) ; ma/us, 147 

 (Fig. 78); ins.'giif, 400 (Fig. 217); 6". 

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

 foliitm, 402 ; tenen-imum, 402 ; Roineri, 

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

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



Splachniim, 281 (Fig. 138) ; lutcum, 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 

 <>r successive, 117; variations in number 

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

 12O, 249 ; decrease in number of, 120, 249; 

 septation of, 120, 249; interpolation of, 

 120, 121, 249 ; interpolation restricted to 

 certain groups, 130; fusion of, I2O, 126, 

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



Sporangiophore, 144, 250, 693 ; of Tmcsip- 

 tti is, 409, 410, 414; of Psilotum, 412, 

 416 ; number of sporangia, 425 ; position, 

 425; development, 426; a part .v//?' generis, 

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

 694 (Fig. 360); of Ht'lminlhostaehys, origin 

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

 37 1 . 377, 379; morphology of, 382. 



Sporangiophoric Pteridophytes, 366 ; sum- 

 mary for, 423 ; a brush of related phyletic 

 lines, 712-714. 



Sporangium defined, 103, 112; 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 

 Osmvmdaceae, 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 Tmcsipteris, 409, 410, 414; of 

 Psiloluui, 411, 416. 



Sporophyte, 32. 



Sporophytic budding, 20, 61. 



Sporophylls, 144. 



Spross-glied-lehre of Celakovsky, 135. 



Stachannularia, 377. 



Slaitroptcns oldhamia 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 

 S^luginclla, 332 (Fig. 173); of Lcpidodcn- 



</><>", 333 (Fig. 174)- 

 Stem-apex of Angiopteris and Osimtinia, 650 



(Fig. 352). 

 Sterile and fertile regions, their relations, 



156, 251. 

 Sterile region secondary, 161. 





