The following images have been taken from a herbarium specimen from VC97 (Westerness) kindly provided by David Long.
I would like to express my thanks to David for his help and support.
Resources you may find useful
Corley, M.F.V. & Wallace, E.C. 1974. Dicranodontium subporodictyon Broth. in Scotland. Journal of Bryology 8:2 185-189