| aecium | (noun) fruiting body of some rust fungi bearing chains of aeciospores | - |
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| americium | (noun) a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms | Synonyms: Am, atomic number 95 |
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| androecium | (noun) a male gametoecium | - |
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| apothecium | (noun) a cuplike ascocarp in many lichens and ascomycetous fungi | - |
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| calcium | (noun) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals | Synonyms: atomic number 20, Ca |
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| cleistothecium | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistocarp |
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| francium | (noun) a radioactive element of the alkali-metal group discovered as a disintegration product of actinium | Synonyms: atomic number 87, Fr |
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| gametoecium | (noun) gametangia and surrounding bracts | - |
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| gynoecium | (noun) a female gametoecium | - |
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| lawrencium | (noun) a radioactive transuranic element synthesized from californium | Synonyms: atomic number 103, Lr |
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| lutecium | (noun) a trivalent metallic element of the rare earth group; usually occurs in association with yttrium | Synonyms: atomic number 71, Lu, lutetium |
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| paramecium | (noun) any member of the genus Paramecium | Synonyms: paramecia |
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| perithecium | (noun) flask-shaped ascocarp | - |
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