Reference

J. Fresnel, C. Billard, F. Hindák, B. Pekarkova (1989): New observations on Porphyridium griseum GEITLER = Rhodella grisea (GEITLER ) comb, nova (Porphyridiales, Rhodophyceae) – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 164: 253 - 262.