Gymnomitrion crenulatum
- A description of the habitat in which this species grows in Wales, along with a photograph of the gametophyte.
- http://home.clara.net/adhale/bryos/gcrenul.htm

Prasanthus
- Description of this genus which occurs in montane and arctic regions and of the species P. suecicus.
- http://www.mobot.org/plantscience/bfna/V3/GymnPrasanthus.htm