The complete taxonomic listing for the Haircap Mosses is:
Kingdom- Plantae
Phylum- Bryophyta (Mosses)
Class- Bryopsida = Musci (True Mosses)
Subclass- Polytrichidae
Order- Polytrichales
Family- Polytrichaceae
Genus- Polytrichum (Haircap Mosses)
Reference: Books, Journals, etc.:
Crum, Howard A. and Lewis E. Anderson. Mosses of Eastern North America. Vol. 2. New York: Columbia University Press, 1981. pp. 1247-1248, 1268-1272, 1283.
Crum, Howard A. Mosses of the Great Lakes Forest. Revised Edition. University of Michigan, 1976. Originally Published as Contributions from the University of Michigan Herbarium, Vol. 10, 1973. Library of Congress # 73-620129. pp. 351-352, 355-358.
Grout, A. J. Mosses: With Hand-Lens and Microscope. Part 1. New York: Published by the author, 1903. pp. 21-22, 25, 31, 33, 62-65, 98, 223.
Grout, A. J. Mosses With a Hand-Lens. Third Edition. New York: Published by the author, 1925. 14, 17-18, 40-41.
Grout, A. J. Moss Flora of North America North of Mexico. Vol. 1. Newfane, Vermont: Published by the author, 1936-1939.
pp. 7, 99, 113, 119, 121, 124-126, 137, 251.
Lesquereux, Leo and Thomas P. James. Mosses of North America. Boston: Bradlee Whidden, 1895. pp. 255, 265-266, 417.