pseudostomata

from The Collaborative International Dictionary of English v.0.48

Pseudostoma \Pseu*dos"to*ma\, n.; pl. {Pseudostomata}. [NL. See
   {Pseudo-}, and {Stoma}.] (Anat.)
   A group of cells resembling a stoma, but without any true
   aperture among them.
   [1913 Webster]