Basionym Rosulabryum capillare (formerly Bryum capillare) is a species of moss in the Bryaceae family.

[1] It has cosmopolitan distribution[2] and is known by the common name capillary threadmoss.

[3] Rosulabryum capillare can use artificial light to grow in places that are otherwise devoid of natural light, such as Crystal Cave in Wisconsin.

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