720 



INDEX 



Cynosurus, 128. 



Cystopteris, phyletic position of, 655 (Fig. 

 354) ; bnlbifera, 19 (Fig. 3). 



Cystopus, 68. 



Cytological distinction of alternating genera- 

 tions, 61. 



Cytopterisfragilis, 615 (Fig. 341). 



Danaea, 94 (Fig. 49), 505 (Fig. 275) ; sorus 

 of, 512 (Figs. 278, 281, 283, 286) ; anatomy 

 of, 525 ; embryo of (Fig. 277) ; alata, 

 symmetry of, 212 (Fig. 106). 



Danaeites, 523 (Fig. 290). 



Davallia, 613 ; phyletic position of, 655 

 ( Fi S- 354); Griffithiana (Fig. 66), 613 

 ( Fi g- 339) 5 hymenophylloides, 615 (Fig. 

 340). 



Decentralisation in Mosses, 286. 



Dennstaedtia, 613 (Fig. 332 bis) ; D. 

 rulnginosa (Fig. 333 c), (Fig. 65), 601, 

 6l6 > 597 (Fig. 332 bis) ; irregular arrange- 

 ment of sporangia of, 598 ; solenostely in, 

 600 (Figs. 333 A-C) ; apiifolia (Fig. 65) ; 

 Davallia series, 613 ; phyletic position of, 

 655 (Fig. 354)- 



Dennstaedtiinae, 595. 



Deparia, phyletic position of, 655 (Fig. 354). 



Dermatogen, 178. 



Desmids, 70. 



Diacalpe, 617. 



Dichotomous branching of stem in Ferns, 

 626 ; theory of origin of shoot, 630. 



Dichotomy in Fern leaves, 627, 628. 



Dicksonia, 592 (Figs. 330, 331); phyletic 

 position of, 655 (Fig. 354) ; Barometz, 

 J 93 (Fig. 97) ; punctiloba, 190 (Fig. 95). 



Dicksonieae, subdivision of the family, 591. 



Dictyostele, 190. 



Dictyostelic state in Ferns, 647. 



Diclyota dichotoma, 66, 81. 



Dipkyscium, symmetry of, 205 (Fig. 104). 



Diploid phase, 47, 52. 



DipZotmema, 554. 



Dipteridinae, 618, solenostely in, 621. 



Dipteris, 618 (Figs. 343-346). 



D. conjugata, mixed sorus, 621 : phyletic 

 position of, 656 (Fig. 354). 



Dispersal of spores, 645. 



Divergent series, 10. 



Dorsiventral construction, 201. 



Dorsiventrality of shoot, 208 ; derivative in 

 Ferns, 626. 



Double leaf-trace, 689, footnote. 



Equisetales, 366 ; external characters, 368 ; 

 spore-producing member, 377 ; anatomy, 

 385 ; embryology, 392 ; summary, 395. 



Equisetum, 94 (Fig. 50) ; anatomy of, 191 

 (Fig. 96) ; reduced leaves of, 239 ; spor- 

 angial development, 377 ; sterilisation in, 

 378; stelar structure of, 386 (Figs. 211, 

 212, 213) ; maximum, 149 (Fig. 79) ; 

 368 (Fig. 193) ; 370 (Fig. 194) ; pratense, 

 367 (Fig. 192) ; 373 (Fig. 196) ; scirpoides, 

 176 (Fig. 91); sylvaticum, polystachyum, 

 370 (Fig. 194) ; hiemale, 369 ; anatomy 

 of seedling, 391 ; root apex (Fig. 92) ; 

 limosum, 369 ; arvense, 370 ; sylvaticum, 

 370 ; myriochaehim, 370. 



Elaterophore, 90, 266. 



Elaters, 262. 



Eligulatae, 291 ; embryology of, 340. 



Embryo, biological study of, 181 ; dependent 

 on prothallus, 238 ; of Equisetnm, 392 

 (Fig. 214). 



Embryology, 173, 251; initial and continued, 

 174; primary in Bryophytes, 660; con- 

 tinued in Vascular Plants, 678 ; of Pterido- 

 phytes, 663 ; segmentation of embryos, 

 664 (Fig. 355) ; of Ferns, 649 ; of 

 Filicales, 649 ; of Lycopods, 340 ; of 

 Ophioglossales, 489 ; of Ophioglossum 

 vtilgatum, 466 (Figs. 260, 260 bis) ; of 

 0. moZuccanum and O. pendulum, 466 ; 

 o&Botryckiummrginianum, 469 (Fig. 261 ); 

 of B. Lunaria, 470 (Figs. 262, 263) ; of 

 B. obliquum, 471 (Figs. 264-266) ; of 

 Helminthostachys, 473 (Fig. 267). 



Enation of leaf, 141 ; of leaves from axis, 

 680; objections answered, 681. 



Endothecium, 272, 278, 285. 



Enumerations of spores, 641. 



Ephemerum, 208. 



Ettckaridium, 96 (Fig. 54). 



Eu- Davallia, mixed sorus, 613. 



Eusporangiate Ferns, relatively primitive, 

 496. 



Epibasal tier, 666. 



Exogenous roots, 219. 



Experimental Morphology, 6. 



External characters of Filicales, 625. 



Extra-prothallial swellings, 673. 



Factors of advance, 85. 

 Fegatella (Conocephalus), 260. 

 Fern, life history of, 14 ; vascular skeleton 

 of, 15 ; sorus of, 20 ; spores of, 20 ; 



