en·do·the·ci·um 
(ĕn′dō-thēsē-əm, -shē-əm)
(ĕn′dō-thēsē-əm, -shē-əm)n. pl. en·do·the·ci·a (-sē-ə, -shē-ə)
The inner tissue of an anther or a moss capsule.
[New Latin endothēcium : ENDO- + Greek thēkion, diminutive of thēkē, chest, receptacle; see dhē- in the Appendix of Indo-European roots.]