Polytrichaceae Polytrichaceae: Links to information about the specimens in the American Bryophyte Catalogue of The New York Botanical Garden. (Polytrichopsida) http://www.nybg.org/bsci/hcol/bryo/Polytrichaceae.html
Atrichum oerstedianum Atrichum oerstedianum: A photograph showing hydrated and dried (curled) shoots. (Polytrichopsida) http://www.science.siu.edu/landplants/Bryophyta/images/Atrichum.oerst.JPEG
Polytrichales Polytrichales: A description of the order. (Polytrichopsida) http://home.manhattan.edu/~frances.cardillo/plants/nonvas/poly.html
Additional
Information: The class of the Bryophyta containing the order Polytrichales, which contains the Families Polytrichaceae and Dawsoniaceae.
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