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Fissidens adianthoides
http://www.helsinki.fi/~korpela/FISSADIA.HTML
Photographic image.
Fissidens serrulatus
http://www.naturenotes.org/archivo/Botany/Fissidens_sp1.jpg
A JPEG image.
Fissidens serrulatus
http://www.naturenotes.org/archivo/Botany/Fissidens_sp2.jpg
A JPEG image.
Fissidentaceae
http://www.nybg.org/bsci/hcol/bryo/Fissidentaceae.html
Links to information about the specimens in the American Bryophyte Catalogue of The New York Botanical Garden.