KOCIOLEK, John P., & Eugene F. STOERMER 1991 (Sept. 11) Taxonomy and ultrastructure of some Gomphonema and Gomphoneis taxa from the upper Laurentian Great Lakes Can. J. Bot. 69(7): 1557-1576, 135 figs. taxa: 8 5 n.s., 1 n.v. of Gomphonema; 2 n.s. of Gomphoneis