thin salcite stalactites growing on the ceiling of an old bomb shelter in the odessa catacombs

old bomb shelter ceiling stalactites salcite humid organic remains rotten wood colonies catacombs odessa microscopy spore microbiology moving mushrooms myxobacteria fruit body microscopic creep plasmodium organism grow crawl myxomycete life tree colony ascomycota aspergillum aspergillus construction dampness decompose fungal mold fungi fungus humidity mould mycelia myxomycota nature rot shell rock slime stone mining water wet residues