Fig. 3

Scanning electron microscope images of the predominant microstructures of the colonies: Structure №1: a, b) sporangial-like tufts in a colony of an “Olive” morphotype; c) accumulation of spore chains in a “WhiteWavyEdge” colony, thickenings at the ends of branches shown by the arrow. Structure №2: d) general view of a “BrownWhite” morphotype colony (spherical elements shown by the arrow); e) reticular structures with nodules in a “WhiteRhizoidFlat” morphotype colony; f) spherical elements in a “BrownWhite” morphotype colony (the arrow indicates a cavity). Structure №3: g) mass of coccoid cells forming the biofilm “CaveCurd”; h) close-up of coccoid cells