or clis·to·the·ci·um

[klahy-stuh-thee-shee-uh m, -see-uh m]
noun, plural cleis·to·the·ci·a [klahy-stuh-thee-shee-uh, -see-uh] /ˌklaɪ stəˈθi ʃi ə, -si ə/.
  1. (in certain ascomycetous fungi) a closed, globose ascocarp from which the ascospores are released only by its rupture or decay.

Origin of cleistothecium Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Plural cleistothecia
  1. A closed spherical ascocarp, such as the truffle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.