INDEX, 
Abortion of spore-producing members, 120, 
127, 161, 700. 
Abortive spikes in Ophioglossaceae, 446; 
sporangia in Lycopodium, 163, 2923 in 
Lsoetes, 165, 307. 
Acacia, 235; seedlings, 185. 
Achyla, 69, . 
Aconitum, 128. 
Acrostichum, 631. 
Actaea, 128. 
Adaptation to Land Habit, 3, 81, 245. 
Adiantum concinnum, 30, 31 (Figs. 14, 15); 
Edgworthi, 183 (Fig. 94). 
Aglaozonia, 66. 
Akrogynous Jungermanniaceae, 264. 
Albugo, 68. 
Alchemilla, apogamy in, 101. 
Allosorus crispus, 627 (Fig. 348). 
Alsophila atrovirens sorus, 603 (Fig. 334); 
excelsa stem-structure, 198 (Figt 100); 
anatomy of young plant, 606 (Fig. 338) ; 
phyletic position of, 655 (Fig. 354); 
pruinata, 604 (Fig. 336). 
Alternating generations, balance of, 33; 
inversion of balance of, 45; cytological 
distinction of, 46, 61. 
Alternation, biological aspect of, 79. 
Amphibious habit, 81; organisms, 3, 244. 
Amphithecium, 272, 278, 285. 
Amplification, 233; progressive in homo- 
sporous forms, 236, 7173; of leaf in 
Ophioglossaceae, 433. 
Anachoropterts, 501. 
Anakrogynous Jungermanniaceae, 264. 
Anatomical evidence, 188. 
Anatomy of Filicales, 646; characteristic of 
strobiloid plants, 649. 
Andreaea, 275 (Fig. 133, 134). 
Andreaeales, 275. 
Anemone nemorosa, 127 (Fig. 70). 
Aneura, 266 (Fig. 127); 267 (Fig. 129); 
ambrostoides, 90 (Fig. 46); 161 (Fig. 86). 
Angiopteris, 505 (Fig. 274); sorus of, 512 
(Figs. 278, 283, 284); anatomy of, 525 
(Figs. 279, 291); embryo of, 508 (Fig. 277). 
Annularia, 372. 
Annulus, 23, 104; of Zgudsetum, 382; 
in Ferns, change of position of, 639. 
Aneimia, 543 (Figs. 301, 302); anatomy, 548. 
Anthocerotales, 267. 
Anthoceros, 268 (Fig. 130). 
Anthoceroteae, self-nutrition of sporogonium, 
237. 
Antithetic alternation, 32, 47, 80; theory, 
general objection to, 659. 
Apex of axis, of constant origin in embryo, 
181, 664, 673. 
Apical cell of axis, origin in embryo, 668 
(Figs. 357, 358); cone of Z. Se/ago, 331 
(Fig. 172); segmentation, 678; with 
small-celled meristem, 679; with definite 
initials, 679. 
Apogamy, 51, 52 (Fig. 33). 
Apophysis, 281. 
Apospory, 53 (Fig. 37). 
Appendages, classification of, 145. 
Appendicular organs, origin of, 86. 
Archacopterts hibernica, 228. 
Archangiopteris, 505; sorus of, 512 (Figs. 
278, 283); anatomy of, 525. : 
Archaeocalamites, 374 (Fig. 82); whorled 
leaves, 230. 
Archegoniate series, origin of, 82. 
Archesporium, 88, 106 ; of Anthoceros, 268 ; 
of moss, 278, 285. 
Archidium, 277, 284. 
