INDEX 



[Many features are indexed only under the generic names. Italics 

 indicate illustrations.] 



Africa, map, 41 



Age of cycads, 70 



Albatross, jg 



Aloe, 58 



Alsophila, 34 



Angiopteris, 34, 103 



Archegonium: initials, 97; devel- 



ment, g8 . 

 Armor of cycads, 70 

 Australia, map, 26 



Blepharoplasts, 108 



Bowenia: general description, 32; 



B. spectahilis, jj; B. serndata, 



35 

 Branching, 74 



Ceratozamia: general description, 

 21; field view, 22; male cone, 

 loi; microsporophylls, 102; 

 sperm, no 



Chavarrillo, 13 



Coleorhiza, 130 



Cone: female, evolution of, 141; 

 male, evolution of, 152 



Cone domes, 76, 78 



Cotyledons, 129 



Crinnm, 58 



Cycadeoidea, 144 



Cycas: general description, 36; 



C. media, female plant, j/; 

 C. revoliUa, female sporophylls, 

 146 



Dioon edule: field view, 2; general 

 description, 11; armor, 77; 

 seedling, 82; male and female 

 plants, 88; ovules containing 

 gametophytes, p^; microspo- 

 rangium, 103; microspores, 105; 

 blepharoplasts, 108; young 



sperms, log; proembryo, 123; 

 female cone, 147 

 Dioon spinulosum: general descrip- 

 tion, 15; tall specimen, ly; fe- 

 male plant, ig; seedling, 136 



Embryo: general description, 121; 

 first division of nucleus, 122; 

 later stages, 123 



Embryogeny, 157 



Encephalartos: general descrip- 

 tion, 45; E. hrachyphyllus, 46; 

 E. AUensteinii var. bispinosa, 

 46; E. Friderici Giiilielmi, 48; 

 E. Lehmanii, 49; E. latifrons, 

 50; E. AUensteinii, 51; E. vil- 

 losus, 52; E. cycadifolins, 52; 

 E. cafer, 53; E. horridns, ^y 



Euphorbia grandidens, 59 



Fern, life-history, gi 



Fertilization: general description, 

 112; gametes and associated 

 structures, 114; fusion of nuclei, 

 iig 



Fiji Islands, 25 



Gametophyte: female, 95; male, 

 107, 108; female, evolution of, 

 153; male, evolution of, 156 



Geological horizons, chart, 140 



Geranium, 58 



Gladiolus, 58 



Growth rings, 76 



Jaguar, 18 

 Jalapa, 13 



Leaf: general description, 79; 



transverse section, 83; margin, 



135; evolution of, 161 

 Lycopodium Phlegmaria, 34 



171 



