356 



INDEX 



Proximal region of wall, 253 

 Pteridhan, apex of root of, 10 (Fig. 12); 

 marginal origin of sorus of, 222 

 P. aquilinuvi (Bracken), nectary of, 205 

 (Fig. 195) ; origin of sorus of, 223 (Fig. 

 218); rhizome of, 4 (Fig. 3); young 

 plant of, 75 (Fig. 69) 

 Pteris, indusium of, 238 



P. cretica^ apogamy in, 319 (Fig. 295) 

 P. elaia, vascular system of, 1 52 (Fig. 



145) 

 P. loitgifolia, prothalli of, 276 (Fig. 267) 

 P. podflphylla^ 153 (Fig. 147); conical 



stem of, 187 (Fig. 178) 

 P. semilata, young sori of, 224 (Fig. 220) 

 P. z^;//<Jryj-^i, marginal type of pinna-supply 

 in, 172 (Fig. 167) 

 Ptychocai-piis unihis^ 208 (Fig. 201); fructifi- 

 cation of, 210 (Fig. 201) 



Radial symmetry, 66 



Ramentum, 200 ; of Cystopteris fras,ihs, 

 201 (Fig. 189) 



Receptacle, origin of, 218 



Reniform indusium, 238 



Reserve materials, 35 



Rhizome, dichotomy of, 69 (Fig. 61); dor- 

 siventral, of Polypodhim vulgare, 67 

 (Fig. 57 bis) ; dorsiventral and dicho- 

 tomous, of Lygodmni scandens^ 67 

 (Fig. 58) ; of Bracken {Pteridiumaqiii- 

 }ifiu?n), 4 {F\g. 3), 34; oi Dennstaedtia^ 

 152 (Fig. 144); of Dryopteris Liti- 

 naeaiia., 27 (Fig. 32) ; of Plagiogyria 

 pycnophylla, 148 (Fig. 138); o{ Pteri- 

 dium aquilinum, 4 (Fig. 3) ; protostele 

 of, in Gleichenia flabellata^ 141 (Fig. 

 131); solenostelic, in Cibotium Baro- 

 meis, 151 (Fig. 142) 



Ring, dictyo-xylic, 133 



Ring-cells, 286, 287 (Fig. 277) 



Root, 175; apex of, in Pteridium^ 10 (Fig. 

 12); first, 312, 345; in Helmintho- 

 stachys, 175; oi Pellaea^ 175 



Roots, adventitious, 1 59 ; of Ferns, 8 ; of 

 Pellaea, 8 (Fig. 9) 



Root-tip, 108 (Figs. 102, 103); oi Osmunda 

 regalis, 112 (Fig. no), 113 (Fig. in) 



Rotation of embryo, 312 



Saccoloma elegans, petiole of, 169 (Fig. 

 162) ; polycyclic axial system of, 153 

 (Fig. 146) 



Sac-shaped urns, 44 (Fig. 51) 



Sahn7tia, 48 



Salviniaceae, 55 ; microsporangia of, 267 

 (Fig. 262) 



Saprophytic prothallus oi Helminthostachys^ 

 283 



Scalariform tracheides, 7 



Scale, flattened, 199 ; or ramentum of Cysto- 

 pteris fragilis^ 201 (Fig. 189) 



Scales, 195, 197 ; covering of, 42 (Figs. 47, 

 48); of Christensetiia^ 201 ; o{ Danaea, 

 201 ; oi Heinitelia grandiflora, 202 (Fig. 

 191); of Mohria^ 201 ; of Phlebodium 

 aurenni^ 202 (Fig. 190); peltate, of 

 Polypodium incaiium, 200 (Fig. 188) 



Scandent habit, 35 



Schizaea dichotoiiia, dichotomy of meristele 

 of, 172 (Fig. 166) 

 S.pHsilla, prothallus of, 279 (Fig. 269) 

 .S". rnpestris, young leaves of, 220 (Fig. 



.213)' 



Schizaeaceae, 55 

 Sclerenchyma, 195, 196 

 Scolopeftdnum,22,o{¥\g. 228); prothalli of, 



284 (Fig. 275) 

 S. vulgare, 323 (Fig. 300) ; apogamy of, 



322 (Fig. 298) 

 Scorpioid dichopodium, 88 

 Seedling oi Botrychium Lnnaria, 307 (Fig. 



293) 



Segmental cleavages in embryo, 299 



Segmentation, apical, n5; at margin of 

 leaves, no (Fig. 105); cellular, of em- 

 bryo, 314 ; in Eusporangiate Ferns, n i ; 

 ofantheridia, 293 (Fig. 282) ; of embryo, 

 301 (Fig. 284), 314; of sporangia, no 

 (Fig. 106), 246, 247 ; primary, 301 ; se- 

 dation according to, n 5 ; sporangial, 

 n5 ; three-rowed, of P/atyccriuiii, 247 ; 

 two-rowed, of Cheiropleiiria^ 246 



Segments of apical cell, ni (Fig. 107) 



Selagittella, wj 



Setiftenbergia elegans^ sporangium of, 252 

 (Fig. 247) 



Seriation according to segmentation, n5 



Sextant walls, 107, n2 



Sexual irregularity, crested state related to, 

 333; organs, 15, 273; organs of Hel- 

 ininthostachys seylanica, 283 (Fig. 274); 

 organs, structure and position of, 63 



Shade-form, 38 



Shoot, dorsiventrality of, 67 ; form of, 27, 

 60; proportions of, 60; simple, 336; 

 symmetry of, 67 



Sieve-tubes, 5, 7 ; of Pteridium, 7 (Fig. 7) 



Similar structures, principle of, 177, 191 



Simple shoot, 336; sorus, 208, 209, 210, 2n 



Simplices, 212 



Simplification of structure, progressive, 117 



Siphonostele, 140 



Size, 177; increase in, 188 



Slide, phyletic, 221, 222 



SHt of dehiscence, shifting of, 256 



Solenostele, 140; corrugation of, in Histio- 

 pteris incisa^ 151 (Fig. 143) 



Solenostelic rhizome of Cibotium Baromefs, 

 151 (Fig. 142); stem of Ferns, 155 

 (Fig. 149) ; structure oi Gleichenia pecti- 

 nata, 143 (Fig. 133) 



Solenostely, 140, 141 ; amphiphloic, 141, 145 



Soleno-xylic stele, 124 



