INDEX 



357 



Solitary sporangia, 207 



Soral region of Leptochilus tricuspis, 233 

 (Fig. 232) 



Sori, fusion of, 227 ; of Asptditon anoma- 

 hun, 225 ; of Deparia Moorei, 225 ; 

 of Gleichettia Jlabellata^ 209 (Fig. 200); 

 of Marattiaceae, 211 (Fig. 202); of 

 Polybotrya^ 234 (Fig. 234); uniseriate, 

 210; young, of Dipteris conjugata, 2 1 6 

 (Fig. 209) ; young, of Histiopteris in- 

 cisa, 224 (Fig. 219); young, of P/^r/j 

 serrulata, 224 (Fig. 220) 



Sorus, 12 (Fig. 14), 206, 207; basipetal, 212 ; 

 constitution of, 240; fission of, 227; 

 gradate, 2 1 2 ; individuality of, 240; loss 

 of individuality of, 225, 227; marginal, 

 219 ; marginal origin of, in Pteridinm, 

 222 ; marginal position of, 217 ; mature, 

 of Loxsoma Cunninghamii^ 214 (Fig. 

 206); mixed, 214; monangial, 208, 

 241 ; monangial, of Lygodium, 235 (Fig. 

 235); of Cory?iepieris Esseng/n, 250 

 (Fig. 245); of Detmstaedtia apiifolia, 

 255 (Fig. 252); of Dennstaedtia rubi- . 

 gifwsa, 215 (Fig. 208); of Gleichenia^ 

 208 ; of Gleichenia pectinata^ 212 (Fig. 

 203) ; oi Hy)itcnop]iylliim IVt/som, 212 

 (Fig. 204); o{ Matteuccia interfnedia, 

 229 (Fig. 226); of Hiyrsopteris elegans, 

 213 (Fig. 205) ; origin of, in Pteridiutn 

 aquilimiin, 223 (Fig. 218); output per, 

 266; position of, 62, 216, 240; primi- 

 tive marginal position of, 339; protec- 

 tion of, 234, 237; relations of, 62; 

 simple, 208, 209,210,211; superficial 

 position of, 217; young, oi Dicksonia 

 Sckeidei, 218 (Fig. 211), 219 (Fig. 212); 

 young, of Hypolepis repens, 222 (Fig. 

 217) 



Spaces, intercellular, 180, 184 



Spermatocytes, 16, 18 (Fig. 21), 286; dif- 

 ferences in number of, in antheridia of 

 various Ferns, 291 (Fig-. 281) ; diminish- 

 ing output of, 292 ; number of, 292 



Spermatozoid, 16, 17 (Fig. 17), 286, 298 



Sperm-cells, 286 



Sperm-numbers, 296 



Sphenophylleae, 103 (Fig. 99) 



Sphenopteris crenata, aphlebiae of, 99 (Fig. 



95) 



Spindle, polarity of, 313; primitive, 313; 

 primitive, theory of, 344 



Sporangia, 209 (Fig. 199); of Botrychitcm 

 Lunaria, 208 (Fig. 198); analogies 

 between, and gametangia, 285, 289; 

 brevicidal, 255; formed simultaneously, 

 339; longicidal, 255; of Aspleninm 

 Trichoimmes, 245 (Fig. 239); of Thyr- 

 sopteris elegans, 213 (Fig. 205); of 

 Zygopteris, 209 (Fig. 199); parallel 

 between, and antheridia, 296; protec- 

 tion of, 240 ; segmentation of, no (Fig. 



106), 244 (Fig. 238) ; solitary, 207 ; two- 

 sided initial cell of, 246; two-sided 

 segmentation of, 246 (Fig. 241) 



Sporangial segmentation, 115 ; stalks, sec- 

 tions of, 248 (Fig. 243) 



Sporangium, 207 (Fig. 197), 214 (Fig. 207), 

 242 ; capsule of, 242 ; definition of, 243; 

 development of, 13 (Fig. 16); Euspor- 

 angiate, 270; Leptosporangiate, 270; 

 of Aiigiopteris evecta, 250 (Fig. 244) ; 

 of Botrychiiim daiicifoliuiti, 247 (Fig. 

 242) ; of Lygodium circinatuni, 265 

 (Fig. 260) ; of Osmunda regalis, 265 

 (Fig. 259) ; of Phlebodiuftt aureum^ 245 

 (Fig. 240) ; of Pilularia amcricana^ 256 

 (Fig. 253); oi Platycerhan, 254 (Fig. 

 251); oi Senftenbergia elegans, 252 (Fig. 

 247); of Trichoinanes speciosuin, 214 

 (Fig. 207) ; ontogenetic origin of, 243 ; 

 origin of, 62 ; position of, in Mohria 

 caff7-orji7n^ 220 (Fig. 214); segmenta- 

 tion of, 12 (Fig. 15) ; stalk of, 247 ; wall 

 of, 249 



Spore of Osmunda regalis, 260 (Fig. 256) 



Sporeling, stele of, 180 



Spore-mother-cells, 13, 258; number of, 

 292 ; of sporangium, 242 



Spore-output, 261; actual, 270; large, 

 importance of, 271 ; numerical, 62 ; per 

 sporangium, 264 



Spore-producing organs, 206 



Spores, II, 13, 20; germination of, 15 (Fig. 

 18); increase by, 206; oi Aspidium 

 trifoliatum, 261 (Fig. 257); oi Platy- 

 soma, 265 (Fig. 258); oi Polypodium 

 vulgare, 260 (Fig. 256); of sporangium, 

 242 



Spore-tetrad, 14 



Sporogenous cells, 257 ; tissue of Maraitia 

 fi-axinea, 258 (Fig. 254) ; tissue of 

 Ophioglossum vulgatum, 260 (Fig. 255) 



Sporogonia of Liverworts, 117 



Sporophyll oi Cheiropleuria, 233 (Fig. 231); 

 of Platycerium angolense, 233 (Fig. 



231) 

 Sporophyll s, 11 

 Sporophyte, 21 ; adaptation of, 49 ; diploid, 



21; embryology of, 63; haploid, of 



Lastraea psetido-mas^ var. cristata, 326; 



primitive, 2>37 > young, of Botrychhtm 



obliqiium, 305 (Fig. 289); young, of 



Tmesiptefis, 341 (Fig. 309) 

 Sporophytic budding, 206, 320 

 Stalk, four-rowed, of Cheiropleitria, 254 



(Fig. 251); of sporangium, 242 

 Stauropteris^ sporangia of, 249 



6". oldhamia, sporangium of, 207 (Fig. 



197) 

 Stelar construction, plan of, of Gletchema 

 pectinata, 144 (Fig. 134) ; construction, 

 plan of, oi Loxsoma Ctmfiiiighamii, 145 

 (Fig. 135); morphology, 177 ; structure, 



