nostoc parmelioides nostoc parmelioides nostoc parmelioides is a species of cyanobacterium in the family nostocaceae. it is notable for its symbiosis with a midge larva, cricotopus nostocicola. nostoc parmelioides scientific classification domain: bacteria phylum: cyanobacteria class: cyanophyceae order: nostocales family: nostocaceae genus: nostoc species: n. parmelioides binomial name nostoc parmelioideskützing ex bornet & flahault 1886