The microscopic image is not clear enough to be identified easily. There is no clear reproductive structures such as conidia, ascospores, sporangiospores, etc to facilitate the identification process.
The colonies which limited with yellow marker with white mycelium may be belong to the fungus Beauveria bassiana, but not exactly. It needs more images to get clearly identification.
I will make a new preparation on monday and examine it under the microscope. I took this picture here four days after placed the sample on the plate , that was obviously too early. thank you all very much for your help !