Ignatov, M.S. & E.E. Perkovsky. Mosses from Rovno amber (Ukraine)
Arctoa (2011) 20: 1-18
Four moss genera are revealed in the Lower Triassic deposits of Yaman Us (Mongolia). One of them, Tricostium, was formerly described from the Upper Jurassic. Three genera, Yamanusia, Atrichites and Palaeosyrrhopodon, are described as a new for science. All these four genera are represented in collection by leaves with finely preserved laminal cell structure. The strong costa and relatively short lamial cells indicate their position within acrocarpous mosses.