A new species of Cololejeunea section Protocolea, is described from Cerro Fábrega in Panama. The diagnostic characteristics of C. tixierii are lobes ovate-lanceolate, lobules never inflate but explanate or folded without forming a keel, reaching about half of the lobe length and perianth only faintly keeled at maturity.
A survey of the literature and a few unpublished identifications of recent collections indicate that 426 taxa have been reported from Costa Rica, including Cocos Island. The distribution of each taxon is indicated by province and parameters are given for most localities within each province.
Se comparan las características de una especie de Aphanolejeunea colectada en la Reserva Biológica de San Ramón, Alajuela, Costa Rica, con las dadas en la descripción de Lejeunea heterophylla de Puerto Rico; ambas pertenecen a la misma especie. A. heterophylla es esencialmente diferente de A. exigua Evans.
Diplasiolejeunea involuta Winkler, a species formerly known only from El Salvador, was collected from shrubs in a non pure Sphagnum - Blechnum bog in Costa Rica. The plant is easily recognized by its large leaves, very convex lobes and very large lobules with obviously involute apex; the species has 3-7 oil bodies of the Jungermannia type per cell. Most characteristics of D. involuta fit with those of the subgenus Austrolejeuneopsis, the size of the underleaves are like those of the subgenus Diplasiolejeunea and the stout lobule covers up to 85% of the lobe, as in the subgenus Physolejeunea.