UMBO

Umbo

An umbo is a raised area in the center of a mushroom cap. Caps that possess this feature are called umbonate. Umbos that are sharply pointed are called acute, while those that are more rounded are broadly umbonate. If the umbo is elongated, it is cuspidate, and if the umbo is sharply delineated but not elongated, it is called mammilate or papillate.

The above text is a snippet from Wikipedia: Umbo (mycology)
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umbo

Noun

  1. A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvæ of echinoderms or in the tympanic membrane of the ear.
  2. One of the lateral prominence just above the hinge of a bivalve shell.
  3. A bump or protrusion on the top of the cap.
  4. The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.


The above text is a snippet from Wiktionary: umbo
and as such is available under the Creative Commons Attribution/Share-Alike License.

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