INDEX 



725 



Pseudosteles, 193. 



I'si'.otaceae, 398, 408. 



Psilotum, 88 (Fig. 45); sporangiophore, 



147 ; spore-producing members of, 416 



(Fig. 232); anatomy of, 418 (Fig. 233); 



408, 412 (Fig. 229). 

 Pteridophyta, 288 ; balance of alternating 



generations, 36. 



Pteridosperms, their discovery, 496. 

 /'/,'f/s, phyletic position of, 655 (Fig. 354) ; 



elata, 616 (Fig. 342) ; hctcrophylla, 632. 

 Pteropsida, 486. 

 rty,-iiocar?ns, 511, 520 (Fig. 288); tiiiitns, 



151 (Fig. 84). 



Rachioptcris Oldhanria, 501. 



Radial construction, 201, 252. 



R.nlnla, 264 (Fig. 125). 



Recapitulation, theory of, 173; applicable 



within limits, 185 ; exceptions to its 



applications, 159, 636, 660. 

 Receptacle of sorus, 634 ; not a result of 



" metamorphosis," 635. 

 Red Seaweeds, 67. 

 Reduction, 233, 253 ; its prevalence in 



phyletic speculation, 235 ; of leaf, 139 ; 



in moss-sporogonia, 238 ; in Ophioderma t 



241 ; follows on seed-habit, 717 ; of chro- 

 mosomes, 50 (Fig. 32) ; phyletic delay 



in, 77. 



Reduction-series, synthetic necessity of, 482. 

 Rhi-^ophora, 96, 142 (Fig. 72). 

 Rhizophores, of Selaginella, 219. 

 l\hi>palodia, 71 (Fig. 41). 

 AY,-, in, 33, 34 (Fig. 17) ; absence of polarity, 



203; archegonium of, 257 (Fig. 118). 

 AY, , isitirfits, 34 (Figs. 18, i8A) ; sporo- 



gonium of, 257 (Figs. 119, 120). 

 Riella, 263. 

 Root of embryo, variable in time and place 



of origin, 671, 672; origin of, 216; 



exogenous, 219; capless, 219. 

 Root-apex of Osmundaceae, 649 (Fig. 351). 

 Rootless sporophytes, 218. 

 Roots, "free-living," 183. 

 Ri",' -tincture in Ophioglossaceae, 458 (Fig. 



256), 489. 



Salvinia, 176, 610. 



Salviniaceae, 610; related to Gradatae, 611. 



Si hizaea, 543 (Figs. 300, 301, 302) : anatomy, 



549- 

 Schizaeaceae, external characters, 542; spore- 



produi ing member.-, 544: anatomy, 

 segmentation of -pi.i-.ingiiim, 547 ( I- ig. 

 305) : phyleiir position of, 1,5) I Fig. 354). 



StAtzotuura, 372 (Fig. 198). 



Schi/.ostelic state, IQ.?. 



Scolopendrium rttlgar? (Fig. 93) ; apogamy, 

 5 2 . 54 (Figs. 34, 35). 



Scolecopteris, 511 (Fig. 282), 521 (Fig. 289); 

 polyiuorpha, 522 I Fig. 289). 



Secondary thickening, 690 ; in l.epiii 

 dron, 334; in Ophiogloaceae, 4SS. 



Seed-habit, 703, 716 ; often leads to re- 

 duction, 705. 



Seed-plants, lulain-r o| alternating genera- 

 tions, 43. 



Segmentation, 176; of embryo, 179; of 

 /.ygote in Lycopod*, 345. 



St'/ti^iiit'/Ja, origin of sporangium, 146 (Fig. 

 74) ; symmetry of, 21 1. 



Selaginalla apns, microsporangium of, 39 

 (Fig. 23); megasporangium of, 40 (I - 

 24) ; microspore of, 40 (Figs. 25, 26). 



Selaginella san^'iiin^Ii uta, 299 ; .t/tir/t'ii.di, 

 299; opus, 317; ;v//V.v/;v\, 317; /i,'/T,-/tca, 

 316; Wallichii t 316; A'ranssiana, 316; 

 inaequalifolia, 334 ; IVilltlonorii, 334 ; 

 ,'/\ r it/a, 334; spiniitosa, 299 (Fig. 51); 

 basal knot of, 22O (Fig. 113); general 

 morphology of, 300 (Figs. 148, 149); 

 sporangia of, 316 (Figs. 163, 164); anatmiiy 

 <>f, 33 2 (I^'S- '73>; embryology of, 356 

 (Fig. 190). 



11 Selago" condition, 164; in Lycopods, 

 164; in hoetes, 165; in l'.>ilotaceae, 165: 

 in Ophioglossaceae, 166 ; in Ferns, 167. 



.S',7///,v/'',v;;'vW, 546 (Fig. 303); Ophioiler- 

 i/id f ica, 522 {I'ig. 289). 



Septa, origin of, 97, no. 



Septum in '/'///, -sift, / is, 411, 41;. 



Series of progression, 10; oi reduction, 10. 



Sexual cycle, 75. 



Sexuality, a constantly recurring feature, o. 



Si.ifi/ltiriii, sb < icture, -'31 : iVuctiii- 



IDIIS of, iJ5 : 'on , a, ',',': i i - 

 337; M,-iitinli, 337; A///.. 137. 



.S'/;v';'. ///, 325. 



Simplices, 117, 407, 498, 634. 

 Small-leaved types primitive, 139. 



nia, 



(Fig. 3131; ..I Matotua, y>" 



of /.d.vAi'w./. ;~ ; (Fig. 521); of iJi-nn- 



lliina,-, Ooo 

 (Fig. 342). 



