“…This is in, conformity with results obtained in nexine-2 in Echiriops bomricirs (Stix, 1964 b). More or less transverse small hollows or channels also occur in the nexine of Epilobiirrrr 1tionlotiii1ti and Znirschrrcrin californica, another onagraceous plant (Rowley, 1970;Rowley et al, 1970). With regard to this and other circumstances not mentioned here, it seems as if the exine stratification in Epilobiiori is of the same type as,that in sample 8, Table I (S, N2; in other onagraceous pollen grains often S1, S2, N2).…”