Caption: Pronephrium . A-D , P. asperum . A , lower surface of central lobes of a fertile middle pinna; B , detail of A (A-B , F.Mueller 7/77, K); C , detail of lower surface of pinna rachis; D , sporangium (C-D , M.S.Clemens s.n. , Jan 1950, K). E-H , P. triphyllum . E , two sterile fronds and one fertile frond; F , detail of lower surface of sterile frond; G , detail of lower surface of pinna rachis; H , sporangium (E-H , M.D.Tindale P7676, K).Illustrators: P.J.Edwards.
Flora of Australia Volume 48 (1998) figure 114.