INDEX 



Numbers in boldface type indicate pages on which illustrations appear 



Abietaceae, 340 

 Acetabularin, 57 

 Achlya, 113, 114 

 Acorus, vascular bundle, 372 

 Acrasieae, 107 

 Adaea, root, 366 

 Actinostele, 220 

 Adianfum, leaflet, 285 

 Adoxa, embryo sac, 388, 389 

 Aeciospore, 144 

 Aeeium, 144 

 Aethalivun, 105 

 Agapanthus, embryo, 396 

 Agaricaceae, 149 

 Agaricus, 148, 149 

 Air chamber, 162, 163 

 Air pore, 162, 163 

 Akinete, 12, 19 

 Albugo, 114, 115 

 Algae, 7 



alternation of generations, 98 



asexual reproduction, 96 



bkie-green, 8 



brown, 66 



classes, 7 



comparison, 93 



evolutionary tendencies, 415 



general conclusions, 94 



golden-brown, 16, 17 



green, 25 



interrelationships, 98 



multicellular bodies, 95 



red, 85 



sexual reproduction, 96 



yellow-green, 18 

 Allium, embryo sac, 387, 388 



root tip, 365 

 Alternation of generations, 42, 422 



Algae, 98 



Bryophyta, 160 



Cladophora, 55 



Cutleria, 70 



Dictyota, 72 



Ectocarpus, 68 



Alternation of generations, heteromor- 

 phic, 70 



isomorphic, 42 



Laminaria, 76 



origin, 423 



Polysiphonia, 92 



Pteridophyta, 209 



Ulva, 42 

 Amanita, 149 

 Amphigastrium, 183, 184 

 Amphipleura, 22 

 Amphithecium, 169, 171, 181, 189, 196, 



202 

 Anabaena, 10, 12 

 Andreaea, 198 

 Andreaeales, 197 



gametophyte, 197 



sex organs, 197 



sporophyte, 197 



summary, 198 

 Androspore, 47 

 Anemia, sporangium, 287 

 Anemone, development of embryo sac, 

 386, 386 



megasporogenesis, 385 



ovule, 385, 386 

 Angiopteris, 271 



antheridium, 274 



archegonium, 275 



leaflet, 272 



sporangium, 272 

 Angiospermae, 362 



apomixis, 397 



chief orders, 399 



embryo, 394 



endosperm, 393 



female gametophyte, 384 



fertilization, 391 



flower, 372 



male gametophyte, 389 



subclasses, 362 



summary, 409 



vegetative organs, 363 

 Annulus, Agaricus, 148 



fern sporangium, 284, 286, 287 



moss capsule, 204 



445 



