An association in the form of a lichen-like crust ("actinolichen") was obtained by seeding
Chlorella xanthella cells and spores of a St1·eptomyces sp. isolated from soil on the surface of potato
sections partially immersed in water at temperatures with a diurna! fluctuation of 9-19 e 01'
14-25 C, and with illumination continuous or during the hours of the higher temperatures. Sections
of the crust showed a lichen-like organized tissue with layers of Slreptomyces sp. spores, hyphae
alone and associated hyphae and algae.