Onocleaceae- sensitive fern family
2 genera in Wisconsin (also Matteuccia – ostrich fern). Sensitive ferns has dimorphic fronds. Sterile frond pinnately lobed. Fertile frond turning black.
Onoclea sensibilis Sensitive fern
Polypodiaceae - rockcap family
40 genera and over 500 species in tropics and subtropics, but a single species in Wisconsin.
Distinctive fronds: simple, pinnately lobed; leathery. Colonizes bare rock.
Sori in two rows on each lobe.
Polypodium virginianum Rockcap fern
Dryopteridaceae - woodfern family
Large and diverse group of ferns; often broadly defined to include other smaller families. 2 genera and 13 species in Wisconsin.
Polystichum acrostichoides Christmas fern
Dryopteris intermedia Shield fern
Western & SE coastal elements
Salviniaceae (Azollaceae) - mosquito fern family
2 species in Wisconsin. Floating aquatic, reduced ferns with 2 ranked leaves, each 2 lobed. Symbiotic relationship with N2 fixing blue green bacteria Anabaena azollae. Heterosporous!
Azolla mexicana & A. caroliniana Floating fern