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Ptilidium is a genus of liverwort, and is the only genus in family Ptilidiaceae. It includes only three species: Ptilidium californicum, Ptilidium ciliare, and Ptilidium pulcherrimum. The genus is distributed throughout the arctic and subarctic, with disjunct populations in New Zealand and Tierra del Fuego. Molecular analysis suggests that the genus has few close relatives and diverged from other leafy liverworts early in their evolution.
The genus Ptilidium has a boreal distribution, and is found in abundance in coniferous forests of Europe, Asia, and North America, as well as in New Zealand and Tierra del Fuego. Plants often grow attached to the bark of trees in the northern hemisphere, but may occur in rocks in mountain districts of New Zealand. At the more temperate ends of its range, plants are restricted to higher elevations.
Text excerpted from the Wikipedia article Ptilidium by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
