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epithecium

[ep-uh-thee-shee-uh m, -see-uh m]
noun, plural ep·i·the·ci·a [ep-uh-thee-shee-uh, -see-uh] /ˌɛp əˈθi ʃi ə, -si ə/. Mycology.
  1. the surface layer of tissue of the fruiting body of lichens and fungi, formed by the union of the tips of the paraphyses over the spore sacs.
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Origin of epithecium

From New Latin, dating back to 1875–80; see origin at epi-, thecium
Related formsep·i·the·ci·al [ep-uh-thee-shee-uh l, -shuh l] /ˌɛp əˈθi ʃi əl, -ʃəl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018