Abstract
Upon examination of type material, the following new synonymies are proposed: Macromitrium altituberculosum Bartr. with M. carionis C. Muell.; M. aureum C. Muell. with M. longifolium (Hook.) Brid.; M. crumianum Steere & Buck with M. leprieurii Mont.; M. semimarginatum C. Muell. with Groutiella chimborazense (Spruce ex Mitten) Florsch.; M. standleyi Bartr. var. subundulatum Bartr. with M. fulgescens Bartr. In addition, the following synonymies were confirmed: M. brevipes C. Muell. with Groutiella apiculata (Hook. & Grev.) Crum & Steere; M. sartorii C. Muell. with M. punctatum (Hook. & Grev.) Brid. Floristic reports include M. leprieurii new to Dominica, Guadeloupe, and Panama, and M. ulophyllum Mitten is reported for the first time from Central America (Panama) and Venezuela. A complete description including illustration is provided for the first time for the latter species. Lectotypes are chosen for all types examined.