INDEX 



Dicksoniaceae, 273 



Dicksonioid Ferns, transition from, 14 



Dicranopteris, 275 



Dictyophylliim exile, spore-output of, 230 

 D. rugosiun, spore-output of, 230 



Dictyoxipliium^ 38 ; coenosori of, 34 ; leaf- 

 blade of, 34; sporophyllof,34(Fig.6o5) 



Didy)}ioc]ilaeiia, 121, 137, 150, 278 



Diellia, 26, 38, 198; a Davallioid type, 28; 



coenosori of, 28 ; vascular system of, 26 



D.falcata, fertile pinna of, 27 (Fig. 597); 



petiolar meristele of, 27 (Fig. 596) ; 



single pinna of, 28 (Fig. 597) 



Diplaziopsis, 138, 151 



Diplazium, 138, 140, 150, 151, 197, 278; 

 sorus of, 146 

 D. ceralolepis, elongated sori without 



indusium, 147 (Fig. 675) 

 D. esadentuiii, medullary system of, 146 

 D. lanceiiin, 142 ; sorus of, 143 (Fig. 672) 



Diplodesmic state, 205; oiChristopteris, 22^; 

 state of Platyceriuin aethiopiciiiii, 210 

 (Fig. 719); structures of Cliristopteris 

 triciispis, 216 (Fig. 725); systems of 

 Platyceriuin willinkii, 211 (Fig. 720) 



Diplora, 149, 151, 191, 199 



Dipteris, 121, 200, 280 

 D. quinqitefiircata, 204 



Dipteroid character of Platyceriuin, 208 

 (Fig. 709) ; derivatives, 232 ; Ferns, 

 200 sqq. (ch. XLV), 280 



Dipteroid-Matonioid affinity, Acrostichoid 

 state of, 228; affinity, progressive fea- 

 tures of, 227 ; Ferns, geographical 

 history of, 231 



Dipteroids, 2 ; diplodesmic sporophylls of, 

 229; reduced spore-output of, 230; re- 

 lation to Cliristopteris, 224 ; sporangia 

 of, 230; venatio anaxeti of, 201 



Directive tendency, 293 



Disintegration of vascular system, 290 



Distal position of sporangium, 267 



Doodia, 181, 182, 198, 279; sori of, 184 

 D. media, 183 (Fig. 704) 



Doryopteris, 81, 98, 282; Acrostichoid de- 

 velopment from, 87; habit of, 84; reti- 

 culate venation of, 84 

 D. ludens, 85 

 D.pedata, coenosorus of, 85 (Fig. 639) 



Drift, Phyletic, 286; progressive, 284 



Dryopteris, 99, 1 37, 278 ;ex-indusiate species, 



129; lop-sidedness of sorus of, 124; 



traces of annulus in, 124; venation of, 



132 (Fig. 663) 



D. decussata, 130; elongated sorus of, 



130 (Fig. 661) 

 D. filix-inas, 120, 121, 122; sori of, 123 

 (Fig. 655); sporangium of, 125 (Fig. 657); 

 young sorus of, 1 10 (Fig. 654), 123 (Fig, 

 656), 251 (Fig. 748) 

 D. Liiinaeaiia (Oak Fern), 120, 129 



Dryopteris {Nephrodiuni), 121 

 D. oreopteris, 120 

 D. phegopteris (Beech Fern), 120, 129; 



ex-indusiate sori of, 130 (Fig. 661) 

 D. spinulosa, 121 



D. thelyptcris, 120 



Dryopteroid Ferns, Acrostichoid deriva- 

 tives of, 131; (I. Woodsieae), c)C) sqq. 

 (ch. XL); (II. Aspidieae), 120 sqq. 

 (ch. XLI) 



Dryopteroids, 2 , 



ElapJioglossuin, 238, 280; Acrostichoid soral 

 surface of, 235 ; dermal scales of, 237 ; 

 habit of, 235 



E. conforinc, habit of, 236 (Fig. 'jyj) 



E. latifoliuni, anatomy of, 237 (Fig. 738); 



soral area of, 238 (Fig. 739) ; venation 



of, 236 (Fig. 236) 

 E. {Rhipidopteris)Jlabcllatuin, 149 

 Embryology, internal, 267 

 Engram, 291 

 Etapteris, 114, 269 

 Eu-Adiantuni, 80 

 Eu-Aspidiuin, 127 

 Eu-Aspleniuin, 150, 197 

 Eu-Blechnoid sporophyll, origin of, 195 

 Eu-Blechiiuin, 163, 164, 165 (Fig. 688), 193 ; 



broad pinnae of, 171 

 Eu-B. brasiliense, 183 

 Etc-Davallia, 17 

 Eu-Dicranopteris, in, 116, 275 

 Eu - Gleichenia, 275 

 Eu-Pteris, 56 

 Eusporangiatae, i 

 Eusporangiate state, 284 

 Evolution, of archegonium and antheridium, 



266 (Fig. 755); problem of, 292 

 Evolutionary bearings, 285 sqq. (ch. l) 

 Ex-indusiate species, Dryopteris, 129 

 Experiment, time limits of, 287 



Factor, size a limiting, 289 



Factors, limiting, 286 



Fadyenia, 121, 127, 137 



Fern, Beech, 120, 129; Bramble, 29; Hard 

 169; Holly, 121; Male Shield, 121 

 anatomy and habit of, 122; Marsh 

 Buckler, 120; Mountain Buckler, 120 

 Oak, 120, 121, 129; Ostrich, 152; Par- 

 sley, 65 ; Prickly Shield, 121 



Ferns, archetype of Class of Ferns, 268 

 Asplenioid, 138 sqq. (ch. XLii), natural 

 grouping of, 150; Blechnoid, 163 sqq 

 (ch. XLIV), 192; Davallioid, 14, \^sqq. 

 (ch. XXXVII), 274 ; Dicksonioid, transi- 

 tion from, 14; Dipteroid, 200 sqq. (ch 

 XLV), 280; Dryopteroid, 131,(1. Wood 

 sieae), 99 sqq. (ch. XL), (II. Aspidieae) 

 120 sqq. (ch. XLl) ; Gymnogrammoid 

 63 sqq. (ch. XXXix), 281 ; Leptosporan 



