| BAS | large class of higher fungi coextensive with subdivision Basidiomycota |
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| BAS | (botany) pertaining to or characteristic of fungi of the class Basidiomycetes |
| BAS | any of various fungi of the subdivision Basidiomycota |
| BAS | comprises fungi bearing the spores on a basidium: Gasteromycetes (puffballs) |
| BAS | comprises fungi bearing the spores on a basidium: Gasteromycetes (puffballs) |
| BAS | a sexually produced fungal spore borne on a basidium |
| BAS | (botany) of or relating to or characterized by spores produced by basidia |
| BAS | a small club-shaped structure typically bearing four basidiospores at the ends of minute projections |
| BAS | (botany) attached by its base (as certain anthers to their filaments or stalks) |
| BAS | turn basic and less acidic, of solutions and substances |
| BAS | leaves or the common basil |
| BAS | any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum |