[Nitrogen-fixing fungal associations with bacteria].

Nitrogen-fixing associations of fungi and bacteria have been isolated from the soil and flooring of coniferous forests. The special composition and the nitrogen-fixing activity of components in associations were determined. Pure fungal cultures did not possess the nitrogen-fixing activity.

[Radial growth rate of fungal colonies in respect of their ecology].

Indices of the radial growth rate of colonies were determined for Circinella circinans and Mortierella ramanniana as well as for the complex of fungi in soil in the course of microbial succession. The maximum of growth (Kr = 0.053 cm/hr) for C.

[Manganese-oxidizing microorganisms inhabiting the phylloplane].

Manganese oxidizing microorganisms belonging to the genus Metallogenium were found in the phylloplane of various trees and grass plants. This is the first evidence that epiphytes participate in the transformation of mineral elements, and that microorganisms belonging to the genus Metallogenium can be found not only in fresh water and soil.