Thamnobryum alleghaniense, the Allegany thamnobryum moss, is located in temperate regions, mostly in the Northern Hemisphere. This moss has drooping branches at the top of a standing stem, resembling small trees in a micro forest. T. alleghaniense is common on rocks in moist, wet, and shady gorges and ravines. Leaf shape is ovate (-oblong), sometimes lanceolate or ligulate. Seta is 10-25mm. Contain dioecious reproduction, and rarely polyocious.

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