Didymodon mamillosus, commonly known as Perthshire Beard-moss is a species of moss

Moss

Mosses are small, soft plants that are typically 1–10 cm tall, though some species are much larger. They commonly grow close together in clumps or mats in damp or shady locations. They do not have flowers or seeds, and their simple leaves cover the thin wiry stems...

 endemic to Europe. It occurs at only five sites including one in Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

 where it is
classified as "Critically Endangered". The other sites are in Iceland

Iceland

Iceland , described as the Republic of Iceland, is a Nordic and European island country in the North Atlantic Ocean, on the Mid-Atlantic Ridge. Iceland also refers to the main island of the country, which contains almost all the population and almost all the land area. The country has a population...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

, the Czech Republic

Czech Republic

The Czech Republic is a landlocked country in Central Europe. The country is bordered by Poland to the northeast, Slovakia to the east, Austria to the south, and Germany to the west and northwest....

 and in north-east Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

.

Named as a new species by Alan Crundwell

Alan Crundwell

Alan Cyril Crundwell was a British bryologist, known for categorizing approximately 20 species of bryophytes, around six of which were previously unknown to science. He spent most of his professional life at the University of Glasgow.-References:...

 in 1967, the Scottish site at Kirkton Glen in Perthshire

Perthshire

Perthshire, officially the County of Perth , is a registration county in central Scotland. It extends from Strathmore in the east, to the Pass of Drumochter in the north, Rannoch Moor and Ben Lui in the west, and Aberfoyle in the south...

 was found again in 1998 by Nick Hodgetts. Jan Kucera, working in Bohemia

Bohemia

Bohemia is a historical region in central Europe, occupying the western two-thirds of the traditional Czech Lands. It is located in the contemporary Czech Republic with its capital in Prague...

 considers it to be a form of D. rigidulus.

See also

• Endemic Scottish mosses:
  • Bryoerythrophyllum caledonicum
    Bryoerythrophyllum caledonicum
    Bryoerythrophyllum caledonicum, commonly known as Scottish Beard-moss, is a moss endemic to Scotland. Recognised as a distinct species in 1982, it had been collected occasionally from 1891 onwards under other names. The largest populations are in the Breadalbane mountains including Ben Lawers with...
    
    
  • Bryum dixonii
    Bryum dixonii
    Bryum dixonii, commonly known as Dixon's Thread-moss, is a moss endemic to Scotland. The species occupies montane habitats, and although rare it has a wide distribution including the central and north-west Highlands, and the islands of Skye, Rùm and St Kilda. Originally discovered on Ben Narnain,...
    
    
  • Pohlia scotica
    Pohlia scotica
    Pohlia scotica, commonly known as Scottish Thread-moss, is a moss endemic to Scotland. The earliest records date to 1964 and this moss was recognised as a distinct species in 1982. The largest populations are in Argyll with smaller populations in Dunbartonshire and Easter Ross. Its favoured habitat...
    
    
• Plagiomnium medium
  Plagiomnium medium
  Plagiomnium medium, commonly known as Alpine Thyme-moss, or Medium Plagiomnium Moss 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...
  
  
• Tayloria lingulata
  Tayloria lingulata
  Tayloria lingulata, commonly known as Tongue-leaved Gland Moss, Lingulate Dung Moss, or Marsh Collar-moss is a moss found in montane habitats in the Northern Hemisphere including Europe, Asia and North America....
  
  
• Flora of Scotland
  Flora of Scotland
  The flora of Scotland is an assemblage of native plant species including over 1,600 vascular plants, more than 1,500 lichens and nearly 1,000 bryophytes. The total number of vascular species is low by world standard but lichens and bryophytes are abundant and the latter form a population of global...