Two new tropical species of Lachnum with red or reddish hymenia are described. Lachnum euterpes occurs on fronds of the palm Prestoea (= Euterpe) and L. victoriani is described from coriaceous leaves of dicotyledonous trees. A full description of each new species is given along with a brief discussion of the morphological differences distinguishing it from other species with which it could be confused. New combinations in Lachnum are made for the tropical fern-inhabiting species Dasyscyphus ulei and D. chermisinus.