Two overlooked species of Maxillaria from Central America

Two new species of Maxillaria from Costa Rica are described to validate names for use in each of several regional floras. The first species treated, M. chionantha (also widespread in Panama), is related to M. pachyacron Schltr. but the leaves are broader, the flowers are somewhat smaller and entirely white. The second species. M. haberi, is best compared to M. planicola C.Schweinf., but the pseudobulbs are subtended by at least one foliaceous bract, and the lip has a 3-carinate callus unlike the ligulate callus with furcate trichomes of the latter species.