A dendroid is the disjoint union of the set of centers and the set of shore points. We show this is also true for λ-dendroids and use this fact to show that the finite union of shore continua in a λ-dendroid is a shore set.
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Nall, Van C. "Centers and Shore Points in λ-Dendroid." Topology Proceedings 31, no. 1 (2007): 227-42.