Tortula densa in Nederland

Recently Tortula densa (Velen.) J.-P. Frahm has been considered to be a good taxon at the species level (Frahm 1994). Frahm studied collections of this taxon from several countries, among these was also one collection from The Netherlands. More recently the author re-examined a number of collections in the T.ruralis-complex. T.densa is likely rather common in The Netherlands. True T.ruralis s.s. is likely very rare in our country, T.calcicolens and T.ruraliformis are quite common. T.densa is reported new for Austria, Belgium, Great Britain, Italy, Norway and Switzerland, based on collections studied and housed in Herbarium Leyden (all as T.ruralis).