The moss Didymodon tectorum (C. Mull.) Saito of Asia is newly reported for
North America based on specimens previously reported as Didymodon reedii Ro
bins. (a new synonym) and Didymodon brachyphyllus (Sull.) Zander, which rem
ains a good species. A key to species of the Didymodon vinealis complex in
North America is presented. Didymodon tectorum and D. brachyphyllus are des
cribed and illustrated and their North American distribution is mapped. The
problem of the first valid publication of Barbula brachyphylla is briefly
discussed. Barbula ferrinervis C Mull., hom. illeg. (= B. feruginervis Brot
h.) is reduced to synonymy with Barbula indica (Hook.) Spreng. var. indica.