Ceratopteris  

Ceratopteris is a common aquatic or semi-aquatic fern of moderate size which is easily identified by the structure of the fronds. These fronds are branched and resemble antlers, therefore this fern is commonly referred to as antlerfern. This genus has a total of 6 species all found in humid, tropic areas. It is found growing in wetlands submerged or emerged in muddy substrate, It is also commonly grown in aquariums and laboratories as it displays an ideal DNA structure for the fern plants and is easily grown.

Images derived from the Flora of Western Australia web page.