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Your first post Tim - as you've been here over five years you must have sat for ages wondering whether to brave it!
I have just spent 32 minutes (none wasted) in books n' web just to add the second agreement in nearly five years! I really HOPE it's correct!
http://bioref.lastdragon.org/Bryophyta/Orthotrichum_anomalum.html (good old Alan)
http://www.naturespot.org.uk/species/anomalous-bristle-moss (good old Leics and Rutland)
http://www.discoverlife.org/mp/20q?search=Orthotrichum+anomalum (good old Malc Storey)
Absent from my Oxford Book of Flowerless Plants (Brightman & Nicholson)
Goodness, have you looked at the NBN map?
And this http://www.gbif.org/species/2672754 Shows one in Mongolia (along Du-Ku Highway. Tian Shan Range (Mt.)) I assume now in the Missouri Botanical Garden collection.
Lat/Lng: 50.401705093521, -4.1278164088726
OS grid ref: SX488579