FLOWER, R.J., V.J. JONES, & F.E. ROUND 1996 ('May' rec'd 24 Oct) The distribution and classification of the problematic Fragilaria (virescens v.) exigua Grun./Fragilaria exiguiformis (Grun.) Lange-Bertalot: a new species or a new genus? Diatom Research 11(1): 41-57, 33 figs., 2 tables [incl. Stauroforma n.g.]