Examination of the holotype of Orthotrichum rhytiore B. H. Allen reveals gametophytic characters which support the placement of the species in Ulota. The species is peculiar within the genus due to its unusual sporophyte morphology, and the occurrence of these sporophytic characters in Ulota is discussed. Ulota rhytiore (B. H. Allen) F. Lara, Garilleti, Albertos & Mazimpaka comb. nov. is the first known species of the genus in tropical America.
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Vol. 111 • No. 2