Abstract
A new species of Dicranum, D. tubulifolium, is described from northern Mexico. The species is apparently related to D. muehlenbeckii B.S. G. of North America, Europe and Asia. Two new combinations are made in the Hypnaceae, Isopterygium machrisianum (Crum) Irel. and Taxiphyllum robusticaule (Bartr.) Irel. Three species ofIsopterygium, I. distichaceum (Mitt.) Jaeg. & Sauerb., I. homomallifolium Redf. and I. muellerianum (Schimp.) Jaeg. & Sauerb., are reported new to Mexico and a key to the species of the country is presented. The morphology of Mittenothamnium scalpellifolium is discussed. While preparing treatments of the genera Dicranum, Isopterygium and Taxiphyllum for the projected Manual of Mexican Mosses (Sharp 1977) being edited by H. A. Crum, University of Michigan, the following new species of Dicranum and two new combinations of pleurocarpous mosses were
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