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;C) be the (up to isomorphism unique) countable homogeneous structure carrying a binary branching C-relation. We study the reducts of (
;C), i.e., the structures with domain
that are first-order definable in (
;C). We show that up to existential interdefinability, there are finitely many such reducts. This implies that there are finitely many reducts up to first-order interdefinability, thus confirming a conjecture of Simon Thomas for the special case of (
;C). We also study the endomorphism monoids of such reducts and show that they fall into four categories.
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