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Ultraviolet |
A range of light, visible to butterflies but not humans. |
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Umbel |
A flat or dome shaped flower cluster, with all the stems originating at the same place, as in Cow Parsley. |
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Umbilicate |
(of cap) having a small central depression, like a navel |
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Umbo |
A central hump on a cap (may be bluntly rounded or sharply pointed) |
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Umbonate |
Possessing an umbo |
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Uncus |
A hook-shaped projection or projections on top of the tip of the male abdomen that are used during mating. |
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uniseriate |
in one row. |
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Universal veil |
Protective tissue enclosing the whole of the developing fruit body |
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Upper tail coverts |
Short contour feathers which cover the bases of the rectrices on the top side of the tail. |
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Utriform |
(of cystidia) bag-shaped |
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