1. BERKELEY M. J. 1857 Introduction to Cryptogamic Botany.
2. BERKELEY M. J. 1874 Notes on North American Fungi Grevillea 3 64.
3. COHN FERD. 1872 Untersuchungen fiber Bakterien. Beitr. z. Biologie der Pflanzen. 1 (Heft. 1): 127-224.
4. On Cristispera veneris nov. sp. and the Affinities and Classification of Spirochaetes;DOBELL C.;Quart. J. Mic. Sc.,1911
5. DUJARDIN F. 1841 Historie naturelle des Zoophytes Paris.