I have provided picture of the fungal growth on sabouraud agar, and its reverse morphology, also the staining using lactophenol cotton blue (LPCB).
For this one you may wanna wait till it sporulate otherwise you may wanna say non-sporulating fungi which means further identification technique is required (eg. biochem or DNA)
Rhizopus or some other Zygomycetes? I'm just guessing... I'm saying it because it doesn't have septa between individual cells and the hyphae are of varying thickness. That's typical of Zygomycetes.
Try to grow it on a rich medium like PDA in room temperature to induce sporulation. Spores are often crucial for identification.
The pictures you presented are not sufficient for a proper identification of the fungus. You may need to do examine a few more microscopic preparations under high power, and then try to identify your fungus with the help of suitable fungi identification guides.
Good luck
Dear Dr Brankica, it is actually a contaminant in the fridge (2-4'C).
Knowing the environment, would help. It is an aseptate fungi. You might see some sporulation over time and start seeing some pigmented area. Observing sporangia, or some reproductive structure can help identify.
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