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Andreaea
Family: Andreaeaceae
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Richard H. Zander in Flora of North America (vol. 27)
Plants commonly cemented to substrate. Stems with stalked mucilage hairs in leaf axils, stalks usually brown. Leaves spiraling around stem in several rows, usually brittle, commonly ending in a distinct apiculus of a single cell; costa sometimes poorly differentiated, sometimes not reaching the leaf insertion; laminal cells with thick longitudinal walls and often pitted or sinuose, transverse walls thin. Capsule 0.5-2 mm. Andreaea is easily recognized in the field by the dark green to blackish dense turf strongly adherent to a rock habitat, the brittle leaves, and capsule opening by four longitudinal lateral slits. These species are largely temperate montane to arctic-alpine in distribution, not uncommon on exposed acid rock surfaces. The present treatment follows B. M. Murray´s (1987, 1988, 1988b) detailed and thorough study closely except that Andreaea alpestris is treated as a synonym of A. rupestris and A. crassinervia as a synonym of A. rothii, following M. F. V. Corley et al. (1981), while infraspecific taxa are not recognized. The costa may be interpreted as strongly excurrent when it fills the leaf subula.

Andreaea acutifolia
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Andreaea alpestris
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Andreaea blyttii
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Andreaea crassinervia
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Andreaea hartmanii
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Andreaea heinemannii
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Andreaea megistospora
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Andreaea mutabilis
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Andreaea nivalis
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Andreaea obovata
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Andreaea rothii
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Andreaea rupestris
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Andreaea schofieldiana
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Andreaea sinuosa
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NSF NEON | Open Data to Understand our Ecosystems The National Ecological Observatory Network is a major facility fully funded by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.