Closterium acutum var. acutum
Closterium acutum var. variabile
Closterium acutum var. linea
Closterium acutum var. subrectum
Closterium acutum var. maius
Closterium acutum var. latius
Closterium acutum f. tenuior
Closterium acutum var. tenerrima
Closterium acutum subsp. acutum
Closterium acutum f. cornu
Closterium acutum f. elongata
Closterium acutum f. intermedia
Closterium acutum f. latior
Closterium acutum f. lyngbyanum
Closterium acutum f. minor