Campyloneurum phyllitidis ' tesselata' - Photographic image of elkhorn fern. Campyloneurum phyllitidis (L.) C. Presl - Species account from USDA/ARS Germplasm Resources Information Network (GRIN). Campyloneurum phyllitidis - Description of this fern and two photographs. Campyloneurum phyllitidis - Characteristics of this fern, sometimes classified as Polypodium phyllitidis, with a distribution map and detailed illustration. Campyloneuron phyllitidis - Provides an images of this fern. Campyloneurum phyllitidis (L.) C. Presl - Plant profile from USDA Natural Resources Conservation Service includes USA distribution map. Campyloneurum phyllitidis (L.) C.Presl - Taxonomic data and mapped distribution from Atlas of Florida Vascular Plants.