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umbilicate. Of the pileus: Having a central navel-like depression, sunken in the center, somewhat funnel-shaped. (17)

umbo. Of the pileus: A raised, conical to convex knob or mound on the center. (17)

umbonate. Of the pileus: provided with an umbo or boss. (17)

uninucleate. Having one nucleus per cell. (14)

unipolar. At one end only. (17)

uniseriate. In one row.

uniseptate. Having one septum. (17)

unitunicate. Having a single-layered ascus wall. (15)

urceolate. Pitcher-like, hollow and contracted at the mouth like an urn. (17)

Uredinales. The rust fungi; obligate plant parasites in the Basidiomycotina. (23)

urediniospore. A binucleate repeating spore borne in the uredinium. (Uredinales) (Also uredospore, urediospore.) (15)

uredinium. The sorus that bears urediniospores in the Uredinales (stage II). (Pl. uredinia.)

urediospore. See urediniospore. (15)

uredium. See uredinium. (Pl. uredia.) (16)

uredosorus. See uredinium. (Pl. uredosori.) (16)

uredospore. See urediniospore.

Ustilaginales. The smut fungi; plant parasites in the Basidiomycotina.