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Ustilago
- type genus of the Ustilaginaceae; genus comprising the loose smuts
Ustilago Maydis
- a common smut attacking Indian corn causing greyish white swellings that rupture to expose a black spore mass
Urocystis
- a genus of smut fungi belonging to the family Tilletiaceae
Urocystis Cepulae
- smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings
Urocystis Tritici
- fungus affecting leaves and stems of wheat
Ustilaginoidea
- genus of imperfect fungi causing plant diseases like smut
Ustilaginoidea Virens
- fungus causing green smut in rice
Universal Veil
- membrane initially completely investing the young sporophore of various mushrooms that is ruptured by growth; represented in the mature mushroom by a volva around lower part of stem and scales on upper surface of the cap
- membrane initially completely investing the young sporophore of various mushrooms that is ruptured by growth; represented in the mature mushroom by a volva around lower part of stem and scales on upper surface of the cap