peri·the·ci·um /ˌpɛrəˈθiʃiəm, si-/
  子囊殼
  peri·the·ci·um /-ˈθɪsɪəm/ 名詞
  (複perithecia)子囊殼
  Per·i·the·ci·um n.  Bot. An organ in certain fungi and lichens, surrounding and enveloping the masses of fructification.
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  perithecium
       n : flask-shaped ascocarp
       [also: perithecia (pl)]