INDEX 
carolinianum, 296 (Fig. 144); com- 
Planatum, prothallus of, 334; déchotomum, 
sporangial wall, 325; zsundatum, 294; 
sporangium of, 313; prothallus of, 340; 
embryo of, 351; phlegmaria, 293; habit 
of (Fig. 142); sporangium of, 313 (Fig. 
158) ; prothallus of, 342; embryo of, 346 
(Fig. 185); salakense, prothallus of, 340; 
Selago, frontispiece ; form of, 292; spor- 
angium of, 311; anatomy of, 328; 
prothallus of, 343 (Figs. 180, 181); 
embryo of, 345 (Figs. 183, 184); com- 
parison of, 363. 
Lycopods, symmetry of, 210. 
Lycopsida, 486. 
Lyginodendron, 705. 
Lyygodium, 542 (Figs. 301, 302); anatomy, 
547 (Figs. 306, 307); sedalatum, fertile 
primordial leaves, 187 ; early fertility, 632. 
Male shield fern, 15. - 
Malformations, 481. 
Marattia, external characters, 505; sorus, 
513 (Figs. 278, 283, 285); anatomy of, 
525; embryology of, 527 (Fig. 292). 
Marattiaceae, symmetry of, 211; external 
characters, 505; spore-producing mem- 
bers, 512; anatomy, 524; embryology, 
527; phyletic position of, 654 (Fig. 354). 
Marchantiales, 257. 
Marsilia, 511; Drummondiz, 59. 
Marsiliaceae, 551. 
Matonia, see Matonineae ; phyletic position 
of, 656 (Fig. 354) ; Dzpterzs series, 618. 
Matonidium, 567. 
Matonineae, 564 (Fig. 315); spore-producing 
members, 565 (Figs. 316, 317); anatomy, 
569 (Fig. 319). 
Medullation in Lepzdodendron, 334. 
Megaphylly, secondary in Ferns, 657. 
Megaphyton, 508, 625. 
Megasporangia, of Sedagznel/a, 317; of [soetes, 
320. 
Meristele, 190. 
Meristems of Ferns, comparative study of, 
650. 
Meroblastic segmentation, 661, 665. 
Mesarch xylem, of He/minthostachys, 486 ; 
of Zmesipteris, 486 (Fig. 268). 
Metamorphosis, 157, 151. 
Metzgeria, 266. 
Miadesmia, 704; membranacea, 301. 
Microdictyon, 567. 
2Z2 
723 
Microlepia, 596 (Fig. 332), 613, 614. 
Microsporangia of Seduginedla, 317; of Zsoetes, 
319. 
Migration from water to land, 83. 
Mixtae, 117, 497, 498, 612, 634. 
Mohria, §42 (Figs. 301, 302); anatomy, 548. 
Monarch roots in Ophioglossaceae, 458 (Fig. 
256); in Lycopods, 259. 
Monoclea, 262 (Fig. 122) ; symmetry of, 204. 
Monophyllous habit in Ophioglossaceae, 431- 
Monostele, 190. 
Moss, cauline stelar column, 195. 
Musci, 272. 
Mycorhiza, in Cyathea, 240; in Neottia 
and Sarcodes, 240; in Psilotaceae, 241 ; 
in Ophioglossales, 241, 477; in Lycopods, 
478; in Ferns, 478. 
Mycorhizic symbiosis, its relation to reduction, 
240. 
Myosurus, 128. 
Najas, £27. 
Nanomitrium, 283 (Fig. 140). 
Nephrodium dilatatum, apogamy, 53 (Fig. 
35): 
Aemation, 67. 
Nematophycus, 228. 
Nephrodium Filix-mas, 15-25 (Figs. 1, 2, 4, 
5, 6, 9, 10, 11); pseudo-mas, Vv. cristata, 
apogamy and apospory, 56 (Fig. 88); 
v. polydactylum, 57, 58 (Fig. 39). 
Neuropteris, 705. 
Non-medullated monostele, 339. 
Non-soral state in Ferns, 633. . 
Notothylas, 269 (Fig. 131). : 
Nuclear division, 47, 48 (Fig. 31). 
Nutrition of sporophyte, 242. 
Nutritive cells, 263. 
Octants, theory of, 179. 
Oligocarpia, 554, 560 (Fig. 312); lédsacordes, 
522 (Fig. 289). 
Onagraceae, 96. 
Onoclea, 617; sensibilis, 29 (Fig. 13)$ 
Struthiopterts, differentiation of leaves, 
169 (Fig. 89). 
Ophioglossales, symmetry of, 212, 430; 
external characters, 431 ; spore-producing 
members, 447, 484; anatomy, 458; em- 
bryology, 464, 489; comparative discus- 
sion of, 476; mycorhiza in, 477; not a 
reduction series, 477 3; origin from sporan- 
giophoric Pteridophytes, 493. 
