Cosmarium multispinosum 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 : 2

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

Replaced name: Xanthidium multispinosum Grönblad & Croasdale (in Scott et al.), Acta Botanica Fennica 69: 47, figs 143–144. 1965, nom. illeg., non Xanthidium multispinosum Möbius (1887: 124) .

Synonym: Xanthidium echinatum Croasdale (in Grönblad & Croasdale), Acta Botanica Fennica 93: 40. 1971.

Note: Grönblad in Scott & al. (1965) was at first uncertain about the identification of X. multispinosum and suggested the possibility of it being a Cosmarium or an Euastrum . The rectangular semicells with margins bearing very small spines, largest in the upper lateral corners, as well as the 4 irregular vertical rows of 3 or 4 spines across the face are morphological features most related to Cosmarium than Xanthidium . Xanthidium multispinosum Grönblad & Croasdale while illegitimate when treated as a Xanthidium is a valid name and becomes available within Cosmarium (Art. 58.1).