Caption: Isoetes . A-C , I. brevicula . A , habit; B , leaf; C , megaspore (A-C , R.J.Chinnock 8249, AD). D-F , I. australis . D , habit; E , leaf; F , megaspore (D-F , W.R.Barker 2482, AD). G-I , I. elatior . G , habit of large plant (note: leaves have been bent down); H , leaf base; I , megaspore (G-I , M.Garrett, 1 Apr. 1991, AD). J-L , I. muelleri . J , habit of semi-aquatic form; K , base of leaf showing velum covering sporangium; L , megaspore (J-L , R.J.Chinnock 8173, AD). M-O , I. gunnii . M , habit; N , basal portion of leaf; O , megaspore (M-O , Hj.Eichler 16712, AD).Illustrators: G.R.M.Dashorst.
Flora of Australia Volume 48 (1998) figure 40.