Plagiomnium medium

{{Short description|Species of moss}}

{{Speciesbox

| image = Plagiomnium medium (b, 144843-474719) 3178.JPG

| genus = Plagiomnium

| species = medium

| authority =(Bruch & Schimp.) T.J.Kop.[http://www.biodiversityscotland.gov.uk/sbl_detail.php?id=39&type=2&navID=93&pageref=sbl_detail&tvk=NHMSYS0000310314 "Species & Habitat Detail: Plagiomnium medium"] Biodiversity Scotland. Retrieved 5 July 2008.[http://zipcodezoo.com/Plants/P/Plagiomnium_medium/default.asp "Plagiomnium medium"] ZipcodeZoo.com Retrieved 5 July 2008.

}}

Plagiomnium medium, commonly known as Alpine thyme-moss{{cite book|last=Edwards|first=Sean R.|date=2012|title=English Names for British Bryophytes|location=Wootton, Northampton|publisher=British Bryological Society|isbn=978-0-9561310-2-7|issn=0268-8034|series=British Bryological Society Special Volume|volume=5|edition=4}} or intermediate plagiomnium moss,{{PLANTS|id=PLME4|taxon=Plagiomnium intermedium|accessdate=7 October 2015}} is a moss found in montane habitats in the Northern Hemisphere.

Research published in 1988 showed that is a hybrid of P. ellipticum and P. insigne via an allopolyploid process, previously considered to be absent in bryophyte evolution.Wyatt, Robert et al. (1988) [http://www.pnas.org/content/85/15/5601.abstract "Allopolyploidy in bryophytes: Multiple origins of Plagiomnium medium"] PNAS 85 pp. 5601-04. Retrieved 5 July 2008.

In the UK it is classified as near threatened. More than 10% of all UK populations occur in the Cairngorms National Park in Scotland including sites in the Lairig Ghru and on the plateau of Lochnagar.Rothero, Gordon "Bryophytes", in Shaw, Philip and Thompson, Des (eds.) (2006) The Nature of the Cairngorms: Diversity in a changing environment. Edinburgh. The Stationery Office. {{ISBN|0-11-497326-1}}. pp. 197-207.