Definitions

from The Century Dictionary and Cyclopedia

  • n. A genus of fossil patelloid gastropods with depressed oval shells which have anterior beaks, thick walls, horseshoe-shaped area with numerous muscular scars, and concentrically lamellate exterior surface. It occurs in Silurian rocks.
  • n. A genus of discomycetous fungi having black coriaceous ascocarps which are at first sunken in the substratum and closed, but finally rupture more or less irregularly. The spores are hyaline or yellowish and muriform. About 20 species have been described, most of which occur on the bark of trees. T. cucurbitaria is found on the white oak in North America and T. caliciiforme on beech in Europe.

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