1. Of northern Europe and America; resembling a miniature fir
   - fir clubmoss, little clubmoss, Lycopodium selago

Type of: club moss, club-moss, lycopod

• family Ascaridae
• family Asclepiadaceae
• family Asilidae
• family Asparagaceae
• family Aspergillaceae
• family Asphodelaceae
• family Aspleniaceae
• family Astacidae
• family Asteraceae
• family Atherinidae
• family Athiorhodaceae
• family Athyriaceae
• family Atrichornithidae
• family Atropidae
• family Aulostomidae
• family Auriculariaceae
• family Avicenniaceae
• family Azollaceae
• family Babesiidae
• family Bacillaceae
• family Bacteroidaceae
• family Balaenicipitidae
• family Balaenidae
• family Balaenopteridae
• family Balanidae