34Q 



INDEX 



Osmimda^ 126, 152, 231; dictyoxylic cylin- 

 der of, 136; sporangia of, 129; spore- 

 output of, 145; stele of, 137 



O. cin}ia?no?nea, apex of young leaf of, 132 

 (Fig. 422); archegonium of, 146 (Fig. 

 435); stele of, 136 (Fig. 427) 



O. Presliana^ leaf of, 1 30 



O. regalis, abnormal sporelings of, 129 

 (Fig. 418); adult leaf of, 130 (Fig. 419); 

 apical region of, 132 (Fig. 422); juvenile 

 leaves of, 127 (Fig. 416); root-tip of, 

 133 (Fig. 423); scheme showing xylem- 

 ring of, 137 (Fig. 428); sporangium of, 

 145 (I^^ig- 434); sporophyll of, 131 (Fig. 

 420); zylem-strands of, 135 (Fig. 426) 

 Osmundaceae, 6, 8, 126 sqq. (ch. xxi), 230; 

 anatomy of, 133; cellular construction 

 of, 132; comparison of, 147-52; com- 

 parison with /'Ar^/i^'^jrza, 278; embryo 

 of, 146; external characters of, 126; 

 gametophyte of, 145 ; hairs of, 143 ; 

 sporangia of, 6; spore-numbers of, 150; 

 spore-producing members of, 143; spo- 

 rophylls of, 150; stelar state of, 149; 

 stele of, 135; "stipular leaf-bases" of, 

 127 

 Osniundites Caniieri, 140 



O. Dowkeri, 140 



O. Duitlopi, 140 



O. Gidbeana, 140 



O. Kidsto7ii, 139 



O. Kolbei, 140 



O. skidegatensis, 140 

 Osmundopteris^ 93 



Palaeontology, facts of, 6 



Palaeozoic fossils, 228 



Pecopteris pen7taeformis, 1 68 



Pe?'ci)!C)iia^ 309 



V&i\o\e oi A iicmia Ph)dHHdts, 161 (Fig. 445); 



oi Ankyropteris ivestphalensis^ 26 (Fig. 



326); oi Gleic/ienia, 198 (Fig. 479); of 



Statiropteris, 28 ; of S. oldhainia, 29 



(Fig. 329); of Coenopterids, 36 

 Phyletic arrangement of Ophioglossaceae, 



91; grouping of Gleicheniaceae, 217; 



scheme, 333; seriation, 8; slide, 39 

 Phyllopodium, 2 

 "Phyllosiphonic" state, 215 

 Pilularia, 176, 192; megaspore of, 186 



(Fig. 468); sporophyte of, 176 

 P. americana compare with Schizaea, 185 

 P. globicUfera^ rhizome of, 177 (Fig. 458); 



sporocarp of, 181 (Fig. 463) 

 Pinna, fertile, of Co?ynepieris Essenghi^ 33 



(Fig- 334); of Metaxya rostrata^ 289 



(Fig. 552); o{ Schizaea, 165 (Fig. 449) 

 Pinna-nature of spike, 88 

 Pinna-origin of fertile spike, 66 

 Pinna-trace, 2; o{ Botryc/niti;i,6^; of B. vir- 

 ginianum^ 64 (Fig. 360); of Gleicheiiia, 



198 (Fig. 480) 



Pinnae, "aphlebioid," 306 (Fig. 567); of 

 Marattiaceae, 99 (Fig. 392) 



Pinnule of Gleicheiiia linearis, 204 (Fig 486); 

 of G. pectinata, 205 (Fig. 488) ; of 

 Lopkosoiia, 284 (Fig. 548); of Todea 

 pellucida, 131 (Fig. 420J 



"Pith, mixed," 21, 25 



Plagiogyria, 275, 281; anatomy of, 277; 

 comparison of, 280; comparison with 

 Osmundaceae, 278; habit of, 276 (Fig. 

 542); mixed sorus of, 281; oblique 

 annulus of, 275 ; pneumatophores of, 

 -77 (Fig. 543); sorus and sporangium 

 of, 279; sporangia of, 280 (Fig. 546) 

 P. pyoiophylla, stem of, 278 (Fig. 544); 



stolons of, 275, 279 (Fig. 545) 

 P. sej/iicordata, bifurcation of, 275 



Plagiogyriaceae, 275 sqq. (ch. XXXl), 281, 

 326; habit of, 275 



"Plaque elastique,"' 168 



Platyzoma, 193, 219; anatomy of, 200; 

 dichotomous branching of, 214; habit 

 of, 199; hairs of, 196; heterophylly in, 

 214; incipient heterospory of, 210; small 

 leaf-traces of, 201 (Fig. 483); sporangia 

 of, 209 (Fig. 492); spore-counts of, 210; 

 transverse section of rhizome of, 201 

 (Fig. 483) 



Platyzomamicrophylla, habit of, 201 ; hetero- 

 phylly of, 201 



Pleiomery of OpJiioglossum spike, 90 



Pneumatodes, 295 



Pneumatophores of Plagiogyria, 277 (Fig. 

 543) 



Polycyclic axial system of Saccoloina, 270 

 (Fig. 538) 



Polycycly in Denns/aedtia dissecta, 269 (Fig. 

 537); oi jMato7iia, 222 



Polypodiaceae, 8 



Primitive F^ilicales, general review of, 325 ; 

 phyletic scheme of, 333 



Prothallus of Boiryc/iiinn virginiaiium., 75 

 (P^ig. 375); of Dicksonieae, 267; of 

 Dipteris conjugata., 318 (Fig. 577); of 

 Hel))niithostacIiys zeylanica, JJ (Fig. 

 378); oi Loxsoma, 257 (Fig. 525); of 

 Marsilea salvatrix^ 185 (Fig. 467); of 

 Maiofiia peciittata, 226 (Fig. 502) ; of 

 Ophioglossum, 78; of O. vt/lgat7/i;i, 

 79 (Fig. 379); oi Schizaca pusiUa, 171 

 (Fig. 457); of Thyrsopteris, 263; of 

 Tricho/iiaiies rigidum, 245 (Fig. 516); 

 scales on, 303 ; vegetative features 

 of, 4 



Protocyatheaceae, 282 sqq. (ch. XXXIl), 292, 

 326; habit of, 282 



Proiotnarattia., 95, 125 



Protostele, 2; of Gleichetiia., 196, 197 (Fig. 

 477), 215; of Grammatopteris, 139 



Psaronius, 100; sections of stems of, T06 

 (Fig. 400); stems ("starling-stones") of, 

 104 



