INDEX OF GENERA. 



A BIES, 60 

 ■^ Abutilon, 1 15 

 Acalypha, 1 12 

 Acaulon, 49 

 Acer, 114 

 Acerates, 129 

 Achillea, 153 

 Achnanthes, 22 

 Achroanthes, 81 

 Acnida, 90 

 Acorus, 74 

 Actaea, 94 

 Actinocyclus, 20 

 Actinoptychus, 20 

 Adiantum, 58 

 Adicea, 86 

 Adopogon, 143 

 Aecidium, 36 

 Aesculus, 114 

 Aethusa, 121 

 Agastache, 132 

 Agrimonia, 103 

 Agropyron, 68 

 Agrostemma, 9 1 

 Agrostis, 66 

 Ahnfeldtia, 12 

 Ailanthus, III 

 Aira, 66 

 Alaria, II 

 Albugo, 27 

 Alectoria, 46 

 Aletris, 78 

 Alisma, 62 

 Allium, 77 

 Alnus, 84 

 Alopecurus, 65 

 Alsine, 92 

 Altenaria, 33 

 Althaea, 1 15 

 Amanita, 42 

 Amaranthus, 90 

 Amblystegium, 56 

 Ambrosia, 145 

 Amelanchier, 104 

 Ammodenia, 92 

 Ammophila, 66 

 Amorpha, iq7 

 Amphiprora, 24 

 Amphisphaeria, 30 

 Amphora, 25 

 Amygdalus, 105 

 Anagallis, 126 



Anaphalus 151 

 Andropogon, 63 

 Anemone, 95 

 Angelica, 120 

 Anomodon, 54 

 Antennaria, 15 1 

 Anthemis, 153 

 Anthoceras, 49 

 Anthoxanthum, 64 

 Anychia, 93 

 Apios, 109 

 Apocynum, 128 • 

 Aposphaeria, 33 

 Aptogonum, 3 

 Aquilegia, 94 

 Arabis, - 99 

 Aralia, 120 

 Arctium, 154 

 Arctostaphylos, 1 25 

 Arcyria, I 

 Arenaria, 92 

 Arethusa, 80 

 Argemone, 97 

 Arisaema, 74 

 Aristida, 64 

 Aristolochia, 86 

 Armillaria, 42 

 Aronia, 104 

 Artemisia, 153 

 Arthocladia, 9 

 Arthrodesmus, 2 

 Asarum, 86 

 Asclepias, 128 

 Ascophyllum, II 

 Ascyrum, 116 

 Asparagus, 78 

 Aspergillus, 29 

 Asplenium, 58 

 Aster, 148 

 Asterionella, 22 

 Atriplex, 89 

 Aulacomnion, 53 

 Auliscus, 20 

 Azalea, 124 



T3ACCHARIS, 150 

 -^ Bacillus, 27 

 Bacterium, 26 

 Baeomyces, 43 

 Bangia, II 

 Baptisia, 106 

 Barbarea, 98 



(155) 



Barbula,5I 

 Bartonia, 128 

 Batrachium, 96 

 Batrachospermum, 12 

 Bartramia, 53 

 Beggiatoa, 27 • 

 Benzoin, 97 

 Berberis, 96 

 Betula, 83 

 Biatora, 44 

 Biddulphia, 20 

 Bidens, 152 

 Blepharostoma, 48 

 Boehmeria, 86 

 Boletus, 39 

 Bostrychia, 14 

 Botrychium, 57 

 Brachyelytrum, 65 

 Brachythecium, 55 

 Brasenia, 93 

 Brassica, 98 

 Bromus, 68 

 Broussonetia, 85 

 Bryopsis, 8 

 Bryum, 52 

 Buellia, 44 

 Bulbochaete, 7 

 Bulbocoleon, 6 

 Bursa, 99 

 Butnera,' 96 



pAKILE, 97 

 ^ Calamagrostis, 66 

 Calla, 74 

 Collinsonia, 1 34 

 Callithamnion, 15 

 Callitriche, 112 

 Calothrix, 18 

 Caltha, 94 

 Camelina, 99 

 Campanula, 142 

 Cannabis 86 

 Cantharellus, 40 

 Capriola, 66 

 Cardamine, 98 

 Carduus, 154 

 Carex, 71 

 Carpinus, 83 

 Carum, 1 22 

 Cassia, 105 

 Castagnea, 10 

 Castalia, 93 



