Abstract
Summary In Botrylloides simodensis, an acute intensive rejection occurred within a day, after incompatible allogeneic colonies were brought into contact with each other at their cut surfaces. From histological and ultrastructural studies, these rejection processes took the following sequence: 1) At the contact area, the tunics facing each other seemed to fuse. 2) Blood cells particularly morula cells) infiltrated into the tunic and migrated to the contact area. 3) Infiltrating morula cells lysed in the tunic and discharged eosinophilic and electron dense substances. In electron micrographs, electron dense filaments appeared in the tunic around the lysing cells. These filaments appeared as bundles of test matrix material to which the discharged substances bound. 4) Finally, a new wall appeared in the tunic, separating the contact area from each colony. Ultrastructurally, the new barrier was a continuous thin dense structure composed of electron dense fibrous elements.
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