3y 



INDEX 



reconstruction of, of Botrychium Lu- 

 naria, 131 (Fig. 124); system of il/<:z- 

 ionia peclitiaia, 154 (Fig. 148); system 

 of Stenochlaena tenuifolia^ showing 

 perforations, 150 (Fig. 141); theory, 

 138 

 Stele, 57, 139; cauline, 139; conical form 

 of, 180; disintegration of, 135, 157, 189 

 (Fig. 180), 191 ; o{ Ankyi-opieris Grayi, 

 123 (Fig. 117), 182; oi Asterochlaetia 

 laxa, 183; of JBottychium virgitiianuin, 

 ^37 (Fig. 129); of Lindsaya linearis^ 

 146 (Fig. 136); of Metadepsydropsis 

 duplex, 128 (Fig. 122); of small plant 

 g{ Platyzoma, 132 (Fig. 125); of spore- 

 ling, 180; of Trichomaiies scandens, 

 123 (Fig. 116); soleno-xylic, 124 



Steles, actual size of, in living and fossil 

 Osmundaceae, 184 (Fig. 176); xylem 

 of, outlines of, 183 (Fig. 175) 



Stellate hairs, of Polypodium litigua, 200 

 (Fig. 188) 



Stem, apex of, of Angioptet'ts evecta, 113 

 •(Fig. 112); apex of, in Osmufzda regalis, 

 9 (Fig. 10) ; apex of, in Trichoinanes 

 radiams, 107 (Fig. loi); conical, of 

 Polypodium vtdgare, 179 (Fig. 171); 

 conical, of Pteris podophylla, 187 (Fig. 

 178); dictyostelic, 155 (Fig. 149); so- 

 lenostelic, 155 (Fig. 149); transverse 

 section of, in Botryopteris cylindrica, 

 182 (Fig. 174); vascular tissue of, 61 ; 

 young, conical form of, 179 



Stem-apices, 106 (Fig. 100) 



Stems of Ferns, 189 (Fig. 180) 



Stenochlaena sorbifolia, fertile pinnae of, 

 232 (Fig. 230) 

 6". te?tuifolia, stelar system of, showing 

 perforations, 150 (Fig. 141) 



Stiff hairs of Gleidienia pectinata, 202 



Stipular growths, 100 



Stipules o{ Angiopteris, 100 (Fig. 96) 



Stock o{ Dryopteris, 149 (Fig. 140) 



Stolons oi Nephrolepis, 190 (Fig. 182) 



Stomium, 13, 251, 256; of sporangium, 242; 

 position of, 254 (Fig. 250) 



Storage and climbing, 35 



Storage-pith, 130 



Storage-stock of Ophioglossio/i pahnatuni, 

 30 (Fig. 36) , 



Strand, compensation, 152 



Strands, accessory, 156 



Structure, progressive simplification of, 

 117 



Structures, similar, principle of, 177, 191 



Sun-form, 38 



Superficial position of sorus, 217 



Superficiales, 140 



Suppression of certain parts, 314 



Surface, diffusing, area of, 178; proportion 

 of, to bulk of organ, 177, 181 



Surfaces, limiting, 178 



Suspensor, 300, 342 ; elimination of, 302 ; 

 liable to be suppressed, 308 ; of Botry- 

 chium obliquum, 305 ; of Helmintho- 

 stachys, 304 ; of Marattiaceae, 303 



Symbiotic fungus, 284 (Fig. 274) 



Symmetry of shoot, 67 ; radial, 66 



Sympodial dichotomy, 91 



Synangia, 234; of Christensenia, 249; of 

 Danaea, 249 ; of Marattia, 249 



Synangium, 208, 242 



Synapsis, 22 



Syngamy, 298 



Tapetum, 13, 258; of sporangium, 242 

 Terminal branching, dichotomous, 337 

 Tetrad-division, 23 (Fig. 30), 258 

 Tham/wpteris Scldechtendalii, 130; leaf- 

 trace in, 162 (Fig. 155) 

 T/iyrsopteris elegans, 153; sorus of, 213 



(Fig. 205); sporangia of, 213 (Fig. 205) 

 Tier, epibasal, 301 ; hypobasal, 19, 301 

 Tissue, sporogenous, of Ophioglossiun vul- 



gatum, 260 (Fig. 255) 

 Tissues, dermal, 195 

 Tmesipteris, yo\xng sporophyte of, 341 (Fig. 



309) 

 Todea barbara, Frontispiece; sporangium 



of, 251 (Fig. 246) 

 T. siiperba,]\x\&x\\\& leaf of, 85 (Fig. 76) 

 Tracheides, 6; isolated, 126 ; oi Pteridium, 



7 (Fig. 6) ; scalariform, 7 

 Tree-Ferns, 54 

 Trichonianes, gemmae of, 280 



T. alatum, piothallus and gemmae of, 



281 (Fig. 271) 

 T. pyxidifernm, archegoniophore of, 282 



(Fig._272) 



T. radicans, apex of, 107 (Fig. loi); ax- 

 illary bud of, 70 (Fig. 63) 

 T. reniforme, 86 (Fig. 78) 

 T. rigidum, filamentous prothallus of, 



280 (Fig. 270) 

 T. scandens, stele of, 123 (Fig. 116) 

 T. speciosum, sporangium of, 214 (Fig. 



207) 

 T. venosujH, Frontispiece 

 Trunk, bifurcated, of Cyathea medullaris, 



158 (Fig. 152) 

 Tubers of Nephrolepts, 43 

 Tubicaulis solenites, 128 (Fig. 121), 161 



(Fig- 154) 

 Two-fifths divergence, 68 

 Typical number, 262 



Uniseriate sori, 210 



Upgrade development from protostele, 133 



Urns, sac-shaped, 44 (Fig. 51) 



Variability, 271 



Vascular anatomy, 192; construction, primi- 

 tive, 338; skeleton (Fig. i), 2; system, 

 120; system, cauline, 139; system, 



