» Antheridia    An image of male Polytrichum plants.    http://botit.botany.wisc.edu/images/130/Bryophytes/Bryophyta/Hairy_cap_moss/Male_MC.html

» Atrichum oerstedianum    A photograph showing two shoots, one hydrated and one curled up and dry.    http://www.science.siu.edu/landplants/Bryophyta/images/Atrichum.oerst.JPEG

» Family Polytrichaceae    Photographic images of several genera, including Dawsonia superba, the world’s tallest moss.    http://www.hiddenforest.co.nz/bryophytes/mosses/familys/polytrichaceae/polytrichaceae.htm

» Genus Polytrichum (Haircaps)    Photographic images of this easily identified moss.    http://www.perspective.com/nature/plantae/polytrichum.html

» Hairy Cap Moss    Photographs of Polytrichum species.    http://botit.botany.wisc.edu/images/130/Bryophytes/Bryophyta/Hairy_cap_moss/

» Operculum    Photograph of an operculum of a Polytrichum species.    http://botit.botany.wisc.edu/images/130/Bryophytes/Bryophyta/Hairy_cap_moss/Polytrichum_operculum_.html

» Polytrichales    A description of the order.    http://home.manhattan.edu/~frances.cardillo/plants/nonvas/poly.html

» Polytrichum    Photograph of gametophytes and sporophytes.    http://botit.botany.wisc.edu/images/130/Bryophytes/Bryophyta/Hairy_cap_moss/Polytrichum_.html

» Polytrichum commune    A photographic image.    http://www.helsinki.fi/~korpela/polytrichum_commune.html

» Polytrichum juniperinum    Description and good photographic images of this species which has a worldwide distribution.    http://www-biol.paisley.ac.uk/bioref/Bryophyta/Polytrichum_juniperinum.html

» Polytrichum ohioense    Photographs of the gametophyte and a microscopic image of a leaf tip and capsule.    http://vis-pc.plantbio.ohiou.edu/moss/Polytrichum.html

» Polytrichum piliferum    A photographic image.    http://www.helsinki.fi/~korpela/polytrichum_piliferum.html