Abstract
Studying Thelypteridaceae in Phia Oac - Phia Den National Park in Cao Bang province, the authors determined that the family Thelypteridaceae includes 8 genera and 12 species. Compared with previous studies, the number of species belonging to the family Thelypteridaceae has increased by 3 species. In addition, the authors have updated the correct nomenclature name of a number of species in the family Thelypteridaceae. Pronephrium is genus with the largest number of species with 4 species (accounting for 33.3%), there is 1 genus with 2 species and 6 genera with 1 species. Within the scope of this paper, the authors have made statistics on the number of species, the number of genera belonging to the family Thelypteridaceae; describe the identification characteristics, where the standard samples were collected (loc. class.), information on the standard specimens of each species (typus), biology and ecology, and distribution of species in the family Thelypteridaceae is distributed in Phia Oac - Phia Den National Park, Cao Bang province.
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