Holotype specimen of Dennstaedtia christophelii （圖片來源：Kevmin，採用  CC BY-SA 4.0  授權） Age Paleogene（Ypresian） 50 Ma Taxonomy Kingdom: Plantae Class: Polypodiopsida Order: Polypodiales Family: Dennstaedtiaceae Genus: Dennstaedtia Species: Dennstaedtia christophelii Morphological description Dennstaedtia christophelii  is currently known only from fossilized fronds, and thus the morphology of its roots, stems, and reproductive structures beyond the preserved sori remains unknown.