INDKX 



727 



Sierilisalion, 84, 87, 161, 246; in Pterido- 

 phyta, 89, 93 ; in Bryophyta, 90 ; in 

 Seed-Plants, 96, 97 (Fig. 57) ; in Mar- 

 rhantiales, 263 ; in Jungermanniales, 267; 

 in Anthocerotales, 269; in Ilepatirae 

 generally, 271; in Mosses, 286: in 

 Bryophytes, 660. 



Stock of Ophioglossaceae, structure of, 459, 

 etc. (Fig. 236) ; of O. Bergiamiin, 460 

 (Fig. 258); of Hflmintkostachys, 460 (Fig. 



257)- 



Stomata, functionless in Sphagnum, 274. 

 Storage-tuber of Phylloglossum, 352. 

 Strobili, symmetry of, 208. 

 Strobilus, theory of, 132, 138, 248; of 



Equisetum, 370. 

 Slroinatopteris, 553. 

 Struthiopteris, 631. 



Subtending position of bract, 695 (Fig. 361). 

 Suppression, 162. 

 Suspensor, its variability, 182; in Bolrychiuin 



obliqiiitin, 472 (Figs. 264-266) ; present or 



absent, 675. 

 Symmetry, 201, 252 ; radial primitive for 



sporophyte, 203, 217, 252. 

 Synangia, in Botrychiiun Litiiai ia, 453 (Fig. 



252) ; in Botrychinw daitfifoliitin, 454 



(Fig. 253); of Marattiaceae, 512. 

 Synapsis, 50 (Fig. 32). 

 Synthetic types, 230. 



Tapetum, 104. 



Thyrsopterideae, 589. 



Thyrsopteris, 589 (Fig. 329); phyletic 

 position of, 655 (Fig. 354). 



Tetrad-division, 49, 50 (Fig. 32), 87. 



Tetraspores, 66, 67, 68. 



Thallophytes, alternation in, 63. 



'J'mcsiptcris, 144 (Fig. 73) ; 408 (Figs. 226, 

 227, 228); spore-producing members of, 

 413 (Figs. 230, 231); anatomy of, 419 

 ( 1- "ig- 2 34); sporangiophore, 147 (Fig. 77); 

 septum fertile, 99 (Fig. 58). 



t, 530, sporangia of, 532 (Fig. 294), 

 533 (Figs. 295, 296); anatomy of, 536 

 (Fig. 298) ; J////V-A/, 582. 



Trabeculae of Isoetes, 95, 318; of I.epido- 

 strolms, 323. 



Tniiictciiiitia, pollen grain of, 43 (Fig. 29). 



Trickomanes, liabit, 575 (Fig. 323); sorus, 

 57& (Fig. 324); sporangia, 579 (Figs. 325, 

 327); spore enumerations, 580; filmy 

 structure, 582; stock, 584; Fcea, 631: 

 alatiti/i, a]>ogamy and apospory, 56. 



Tuf'icaii/i ', 501. 



Uebergipfelung theory of Potonie, 135. 

 Ulex seedlings, 185. 

 Ulothrix, 73. 

 Uredineae, 69. 



Vaccinia in Myrtillus, symmetry of, 209. 

 Radial type of early Ferns, 625. 

 Vascular shoot, symmetry of, 206. 

 Vascular skeleton, 685. 

 / 'ciitchcria, 64. 

 I'e^talio liui^itt'^<-iis, 157. 

 Vegetative region of Pteridophytes, sym- 

 metry of, 209. 

 Velum, origin of, 319. 

 Venation in Ophioglossaceae, 463. 

 Ventral lobe, 153, 426, 481. 



Water-relation, 2. 

 Wei-wit sclna, floral symmetry, 208. 

 Whorled leaves, probably primitive, 711. 

 Wings of leaf in Ferns, comparative study 



of, 651 (Fig. 359). 

 H'oodsia, 617. 

 Working hypothecs, summary of, 244. 



Xylem-core, 334. 



.\\lrlli-i-l.inds, 330. 



X\lrm-s| gi- in 1 y~i\!-odinni, 330. 



ris, 585, sporangia of, 501, 508 (Fig. 

 272) ; 529, Grayi, 499 (Fig. 270). 



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