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Rosulabryum billardieri
Rosularyum billardierei, is a species of moss in the familiy Bryaceae. The Genus was previously placed under Bryum and thus the species was previously referred to as Bryum billardieri. The species is often found growing in cushions or short tufts in a variety of habitats ranging from dry forests, alpine regions to urban areas, in temperate to subtropical regions of the Southern Hemisphere.

Description & Habitat
R. billardieri is a dioicous moss which produces erect, short stems with spirally arranged, spreading leaves which appear as neat rosettes when viewed above. It is a wide spread species found sporadically in rainforest margins, growing on rocks, logs, and soils.

Growing up to 6cm in height, is often found in small clumps at the base or in the shade of smaller plants. Stems simple or repeatedly branched 10-60mm tall with a brown tomentum towards base, with red-brown rhizoids. Unbrached stems are crowned with a tuft of leaves with progressively smaller ones below .The leaves are mostly obovate and rosulate, with the upper leaf boarder narrow (1-3 layers), not hyaline. Leaves are wide spreading or erect when moist and when dry appear contorted and twisted around leaf apex.

Due to its dioicous nature, it is possible to find groups of plants close together, some with a distinctive sporophyte which ends in a cylindrical capsule pointing down from the top of a hooked seta (stalk), and some without.

Distribution
There has been evidence of R. billardieri found widespread throughout the Southern Hemisphere including;  Tasmania, WA, SA, QLD, ACT, NSW, Lord Howe Island, Norfolk Island, New Zealand, and even as far as Papua New Guinea. Often common in wet sclerophyll forest, rainforest, woodlands, coastal vegetation and near streams. Its occurrence and distribution continues to be monitored.

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History
The genus Rosulabryum comprises the rosulate species of Bryum. The genus includes 75-100 species, 14 of which are occur in Australia (five are endemic).

Taxonomy
Rosulabryum , in reference to the leaves being clustered in rosette's. From the Latin Rosula (a rosette) and the Greek bryon (a moss). The genus comprises of the rosulate species of Bryum.

Taxonomy of the Bryaceae is in a constant state of flux and is extremely variable. In Tasmania, Rosulabryum is represented by 7 species, with the genus previously placed under Bryum.