Jamesonia Hook. & Grev., Pl. Voy. Russes Monde

Kessler, Michael, Smith, Alan R. & Prado, Jefferson, 2017, Prodromus of a fern flora for Bolivia. XXVII. Pteridaceae, Phytotaxa 332 (3), pp. 201-250 : 221

Jamesonia Hook. & Grev., Pl. Voy. Russes Monde 2: t. 178. 1830.

Jamesonia (A. Tryon 1962) is a characteristic genus of humid grasslands above timberline along the eastern Andean slope. It is characterized by narrow, linear, erect, 1-pinnate blades with a circinate apex and 80–200 pairs of pinnae that are usually less than 1 cm long. Jamesonia is closely related to Eriosorus and hybridizes with it; phylogenetic studies suggest that both genera should be merged (PPG I 2016; see Eriosorus for further comments). Eriosorus usually has more than 1-pinnate blades with flat (vs. inrolled) margins and lacks circinate blade apices. A neotropical genus of about 20 species, seven in Bolivia.

The genus Tryonia of southern Brazil is closely related and recently segregated from Eriosorus / Jamesonia , and is sister to a clade comprising Taenitis , Syngramma , and Austrogramme ( Cochran et al. 2014) .