rhizopus nigricans

black root mold moldy bread sporangia rhizopus genus hyphae spores fungal diseases rot blue white yellow microbiology bacteriology virology mycoplasma chlamydia bacteriophage fungi medicine basic scientific photomicrography microscope education publication cell wall nucleus cytoplasm source infection route transmission susceptible population pathogenic bacteria infectious human beings internal necrosis fever immune cells lymphocytes leukocytes antigens antibodies bleeding digestive system respiratory urinary blood