Cosmarium spinulosum G.J.P.Ramos, C.E.M.Bicudo & C.W.N.Moura, 2022

Ramos, Geraldo José Peixoto, 2022, Nomenclatural and taxonomic notes on Brazilian desmids IV, Notulae Algarum 224, pp. 1-7 : 3

Cosmarium spinulosum G.J.P.Ramos, C.E.M.Bicudo & C.W.N.Moura , nom. nov.

Replaced name: Cosmarium aculeatum Kurt Förster & Eckert (in Förster) Hydrobiologia 23: 386, pl. 22: fig. 25, pl. 45: fig. 14. 1964, nom. illeg., non Cosmarium aculeatum Wolle ( Wolle 1883: 17, pl. XXVII: fig. 12).

Note: While Förster’s original description lacks an explicit designation of type, a single gathering was indicated “Rio das Femmeas bei Porta Azul (Goyaz)”, currently Tocantins State (ca. 13° S, ca. 48° W), which serves to validate the name (Art. 40.2). The new epithet derives from the spiny cell wall. It should also be noted that “ Cosmarium aculeatum Corda ” ( Corda 1839: 218), is an invalid name as it cited “Euastr. Ehr. 1. c. fig. II.”, a clear reference to Ehrenberg ( Atlas 1838: legend to pl. XII [12], fig. II [2]) a lapsus calami for Euastrum apiculatum Ehrenberg, 1838 (see text p. 112) and is thus an invalid name. Additionally, “ Cosmarium aculeatum Brébisson ” [in Meneghini 1840: 218, based on “ Binatella aculeata Brébisson ” ( Brébisson & Godey 1835: 58, pl. VII pro parte; also invalid] is invalid as a pre-starting point name for the group even though it was provided with a description and an illustration. Both of the latter designations were validated as Micrasterias apiculata Meneghini ex Ralfs (1848: 209) .