96, 106, 122.

_Anthoceros_, _Anthoceroteae_, 91; Fig. 57.

_Aphanocyclae_, 185, 196.

_Aplectrum_, 167; Fig. 90.

_Apocynum_, _-aceae_. See "Dog-bane."

_Apostasieae_, 164.

Apple, 145, 171, 206; Fig. 114.

Apricot, 207.

_Aquilegia_. See "Columbine."

_Aralia_, _-aceae_. See "Spikenard."

Archegonium, 89, 97, 105, 122, 133, 140, 144.

Archicarp, 138, 145.

_Arcyria_, 13; Fig. 5.

_Arethusa_, _Arethuseae_, 166; Fig. 90.

_Argemone_, 191.

Aril, 189.

_Arisaema_, 78, 157; Fig. 86.

_Aristolochia_, _-aceae_, 224.

Aroid, _Aroideae_, 157.

Arrow-grass, 167.

Arrowhead, 167; Fig. 91.

Arrowroot, 163.

_Asarum_. See "Wild ginger."

_Asclepias_, _-daceae_. See "Milk-weed."

_Ascobolus_, 71-73; Fig. 43.
culture of, 71.
spore fruit, 71.
archicarp, 71.
spore sacs, 72.

_Ascomycetes_, 65, 66.

Ascospore, 66.

Ascus, 66, 69.

Ash, 218; Fig. 122.

_Asimina_. See "Papaw."

_Aspidium_, Fig. 70.

_Asplenium_, 104; Fig. 70.

Aster, 224.

_Atropa_. See "Deadly nightshade."

Axil, 174.

Azalea, 210; Fig. 116.

_Azolla_, 117; Fig. 71.

Bacteria, 15, 17, 19; Fig. 8.

Balsam, _Balsamineae_, 198.

Bamboo, 162.

_Bambusa_. See "Bamboo."

Banana, 163.

Barberry, 17, 187; Fig. 101.

Bark. See "Cortex."

_Basidiomycetes_, 77.

Basidium, 77, 80, 83.

Basswood, 195; Fig. 106.

Bast. See "Phloem."

_Batatas_. See "Sweet-potato."

_Batrachospermum_, 53; Fig. 31.

Bean, 207, 208.

Bear-grass. See "_Yucca_."

Bee, 227, 228.

Beech, 183.

Beech-drops, 218.

Beet, 184.

Beggar's-ticks, 215.

Begonia, 3, 205.

Bell-flower, 220, 226; Fig. 123.

Bellwort, 156.

_Berberis_, _-ideae_. See "Barberry."

Bergamot oil, 234.

Berry, 145, 156.

_Betulaceae_, 183.

_Bicornes_, 210.

_Bignonia_, _-aceae_, 218.

Biology, 2.

Birch, 183.

Bird's-nest fungus. See "_Cyathus_."

Bishop's cap, 202; Fig. 111.

Bismarck brown, 233.

Bitter-sweet, 199; Fig. 109.

Black alder, 199.

Blackberry, 207.

Black fungi. See "_Pyrenomycetes_."

Bladder-nut, 199; Fig. 108.

Bladder-weed, 33, 217; Fig. 120.

Bleeding-heart. See "_Dicentra_."

Blood-root, 191; Fig. 103.

Blue-eyed grass, 156.

Blue-flag. See "_Iris_."

Blue-green slime, 15.

Blue valerian. See "_Polemonium_."

Borage, 215.

_Borragineae_. See "Borage."

Bordered pits, 138.

Botany defined, 2.
systematic, 3.

_Botrychium_. See "Grape fern."

Box, 201.

Bract, 199,