Willea rectangularis (A. Braun) D.M. John, M.J. Wynne & P. Tsarenko, comb. nov.

Basionym: Staurogenia rectangularis [‘rectangulare’] A. Braun 1855. Algarum unicellularum genera nova et minus cognita, praemissis observationibus de algis unicelularibus in genere: 70.

Nomenclatural synonyms: Chloropedium rectangulare Nägeli (in litt. 1849 cited by Braun 1855: 70); Crucigeniella rectangularis (A. Braun) Komárek (1974: 37) .

Note: there is some confusion regarding the authority for Crucigeniella rectangularis because of Braun (1855, p. 70) mentioning ‘ Chloropedium regulare, in litt. Nägeli 1849’ in parentheses when describing Staurogenia rectangularis . The Nägeli epithet has not been validly published and in using only part of this binary designation Braun becomes author of the validly published Staurogenia rectangularis, according to Article 46.4 of the ICN (McNeill et al. 2012).