Microgramma - Species list from Manual de Flora de Costa Rica with hypertext links to specimen data. www.mobot.org/manual.plantas/055607/G055885.html
Microgramma heterophylla (L.) Wherry - Taxonomic data and mapped distribution from Atlas of Florida Vascular Plants. www.plantatlas.usf.edu/main.asp?plantID=2713
Microgramma lycopodioides (L.) Copel. - Distribution and other data from the Ferns of Barbados. scitec.uwichill.edu.bb/bcs/staff/lec/Fern_species/microgramma_lycopodioides.htm
