Anthocerotophyta - Phylogenetic tree for the Hornworts from the Tree of Life Web Project and a photograph of a species of Phaeoceros. - http://tolweb.org/Anthocerotophyta/20597
The Hidden Forest: Hornworts - An introduction to the Anthocerotopsida outlining their unique features and methods of reproduction with several photographs of Anthoceros species. - http://www.hiddenforest.co.nz/bryophytes/hornworts/
Hornwort Web Portal - Provides information on research into various aspects of hornwort biology including the production of a new system of classification, and photographs of many species. - http://www3.uakron.edu/biology/hornworts/hornworts.html
Return of the Hornworts - Article by Anna Levin describing how a walk across a muddy field inspired the bryologist David Long to consider how changing agricultural practices were affecting Bryophytes on arable land. - http://rbg-web2.rbge.org.uk/bbs/Learning/hornworts.htm
Hornwort - Photograph of this species with sporophytes. - http://botit.botany.wisc.edu/images/130/Bryophytes/Anthocerophyta/Hornwort_w_sporophytes.html
Anthocerophyta - Gallery of images from the University of Wisconsin Botany Department. - http://botit.botany.wisc.edu/images/130/Bryophytes/Anthocerophyta/
Classification of hornworts - Four classification systems of the Anthocerotophyta. - http://www.wzip.uakron.edu/biology/hornworts/classification.html
Thallus - A photograph of hornwort thallus. - http://botit.botany.wisc.edu/images/130/Bryophytes/Anthocerophyta/Thallus_MC.html
Stoma - A microscopic image. - http://botit.botany.wisc.edu/images/130/Bryophytes/Anthocerophyta/Stoma_MC.html
Thallus cells - A microscopic image. - http://botit.botany.wisc.edu/images/130/Bryophytes/Anthocerophyta/Thallus_400x_MC.html
Sporophyte Foot - A microscopic image of a cross-section through the foot of a sporophyte. - http://botit.botany.wisc.edu/images/130/Bryophytes/Anthocerophyta/Sporophyte_foot_MC.html