Abstract
Regine Jahn and Karen Serieyssol kindly pointed out that two names were published for one new nomenclatural type in the same publication (see Flower 2005). This makes both names invalid (Greuter et al. 2000, Art. 34.2). Flower (2005) had described the new variety Cyclotella stelligera var. microrobusta from the Falkland Islands. At the manuscript proof stage, however, another publication appeared in which the stelligeroid Cyclotella taxa were transferred to a new genus, Discostella (see Houk & Klee 2004). A note to this effect and an intended new combination was inadvertently added to the proofs of Flower (2005).