Ceratodon columbiae - A photograph of a dried herbarium specimen. image.nybg.org/herbim/0010/m-1-00333401big.jpg
Ceratodon heterophyllus - A photograph of a dried herbarium specimen. image.nybg.org/herbim/0010/m-1-00333405big.jpg
Ditrichaceae - Links to information about the specimens in the American Bryophyte Catalogue of The New York Botanical Garden. www.nybg.org/bsci/hcol/bryo/Ditrichaceae.html
The Fire Moss - The taxonomy and a description of Ceratodon purpureus. www.rook.org/earl/bwca/nature/moss/ceratodon.html
