This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Polytrichum Juniperum, Hair-Cap Moss. This common moss is a hydrogogue diuretic. An infusion made from a handful of the green plant is one of the most positive diuretics of a non-irritating character. It has been known to increase the flow of urine in dropsy to the extent of voiding forty pounds in twenty-four hours. Its preparations are not very reliable. Probably the ec. tr., in 20 to 60 I. doses, is about the most active of them, but the infusion is to be preferred.