(R. ) Bitter, ?Repert. Spec. Nov. Regni Veg. 15: 150. 1918.?, 1918.

(R. ) Bitter, ?Repert. Spec. Nov. Regni Veg. 13: 172. 1914.?, 1914.

(R. ) Bitter, ?Repert. Spec. Nov. Regni Veg. 13: 100. 1914.?, 1914.

(R. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 434. 1919.?, 1919.

(R. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 334. 1919.?, 1919.

(R. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 439. 1919.?, 1919.