Cosmarium hammeri var. hammeri
Cosmarium hammeri var. homalodermum
Cosmarium hammeri var. protuberans
Cosmarium hammeri var. hibernicum
Cosmarium hammeri var. croasdale
Cosmarium hammeri var. sinuatum
Cosmarium hammeri var. javanicum
Cosmarium hammeri var. elevatum
Cosmarium hammeri var. minus
Cosmarium hammeri f. queenslandica
Cosmarium hammeri f. minus
Cosmarium hammeri var. queenslandicum
Cosmarium hammeri var. schmidlei
Cosmarium hammeri var. sublaeve
Cosmarium hammeri var. subbinale
Cosmarium hammeri f. abscissum