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Racomitrium lanuginosum
''Racomitrium lanuginosum'' is a widespread species of moss found in montane and arctic tundra across the Northern and Southern hemispheres. It grows as large mats on exposed rock and in boulder scree, particularly on acidic rocks. Its leaves have a characteristically decurrent and toothed hair-point, which gives rise to its regional common names "woolly fringe-moss", "hoary rock-moss" and "woolly moss".
==Description==
''Racomitrium lanuginosum'' grows as "large cushiony mats". Its stems are up to long and irregularly branched.〔 The leaves are long, wide, lanceolate, pointed and with a strong midrib.〔〔 They end in a long, thin hair-point, with teeth along both sides pointing 40°–90° from the axis of the leaf.〔 The hyaline (transparent) margins of the hair-point are decurrent along the sides of the leaf.〔 Especially when dry, these hair-points give the plant a downy appearance, which is referenced in several of the common names for the species.〔
Sporophytes are rarely produced,〔 although they are reported to be abundant in coastal areas.〔 The capsules are long, smooth and brown, and contain spores, which are 8–12 μm long.〔 The form of the hair-points on the leaves of ''R. lanuginosum'' is unique among mosses.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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