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Alternate Host One of two kinds of plants on which a parasitic fungus (e.g., rust) must develop to complete its life cycle. ...

Anamorph Asexual stage of a fungus. ...

Anthracnose Disease caused by acervuli-forming fungi (order Melanconzales) and characterized by sunken lesions and necrosis. ...

Antibiotic A complex chemical substance produced by one microorganism that inhibits or kills other microorganisms (e.g., streptomycin). ...

Antibody A specific protein formed in the blood of warm­blooded animals in response to the injection of an antigen. ...

Antigen Any foreign chemical (normally a protein) that induces antibody formation in animals. ...

Antiseptic A substance that prevents, retards, or destroys microorganisms. ...

Apothecium An open, cuplike, or saucer-shaped sexual fungal fruiting body containing asci. ...

Ascomycetes A group of fungi characterized by the production of sexual spores within an oval or tubular membranous sac called an ascus. ...

Asexual Vegetative; without sex organs, sex cells, or sexual spores, as the anamorph of a fungus. ...