The following paper represents one of a series on the current status of the tropical genus Leucoloma Brid. The first portion of the paper summarizes the morphological characters of the genus to set the foundation for the revision of Subgenus Leucoloma. Two additional papers on Leucoloma are found in this volume of THE BRYOLOGIST. The results presented here incorporate the phylogenetic and biogeographic analyses that have been published previously (La Farge-England 1998). The focus of this paper is the revision of Leucoloma subgenus Leucoloma in Africa and Madagascar. This includes a revision of 25 species, including two new species, two new subspecific taxa, and one new combination (Leucoloma madagascariense sp. nov., L. membranaceum sp. nov., L. chrysobasilare ssp. africana ssp. nov., L. ochrobasilare ssp. longifolium comb. nov., L. zuluense var. ovatum var. nov.), new synonymy, a key to species and subspecific taxa, distribution maps, and illustrations of each species.
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