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horn-tooth moss
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horn-tooth moss

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Also known as: Ceratodon
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Ceratodon purpureus
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horn-tooth moss, any plant of the genus Ceratodon (about 5 species) in the subclass Bryidae. The most abundant of the species, C. purpureus, has a worldwide distribution and is conspicuous because of its purple capsule (spore case), especially when growing on bare, acidic soil or burned areas. Horn-tooth mosses are 1 to 2 cm (about 2/5 to 4/5 inches) high and grow in mats or tufts in dry habitats such as on walls, lawns, and sidewalks; but they may sometimes be found in swamps. Male and female reproductive organs are borne on separate plants. The capsules are held horizontally and have long, deep furrows when mature.

This article was most recently revised and updated by William L. Hosch.