INDEX. 



Abortion of spore-producing members, 120, 



127, 161, 700. 

 Abortive spikes in Ophioglossaceae, 446 ; 



sporangia in Lycopodium, 163, 292 ; in 



Isoetes, 165, 307. 

 Acacia, 235 ; seedlings, 185. 

 Achy la, 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 (Fig. 100) ; 



anatomy of young plant, 606 (Fig. 338) ; 



phyletic position of, 655 (Fig. 354) ; 



prinnata, 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, 717 ; of leaf in 



Ophioglossaceae, 433. 

 A nachoropteris , 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); 



ambrosioides , 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 Equisetum, 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 L. Selago, 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. 

 Archaeopteris hibernica, 228. 

 Archangiopteris , 505; sorus of, 512 (Figs. 



278, 283) ; anatomy of, 525. 

 Archaeocalaniites, 374 (Fig. 82) ; whorled 



leaves, 230. 



Archegoniate series, origin of, 82. 

 Archesporium, 88, 106 ; of Anthoceros, 268 ; 



of moss, 278, 285. 

 Archidium, 277, 284. 



