Microbes in Human Welfare

Mycorrhiza is a symbiotic association between a fungus and the roots of a higher plant.
In endomycorrhiza the fungal hyphae penetrate the cortical cells of the root (vesicular-arbuscular mycorrhiza, VAM).
Many members of the genus $Glomus$ form such mycorrhiza; the fungus absorbs phosphorus from the soil and passes it to the plant.
$Nostoc$ is a cyanobacterium, $Agaricus$ is the mushroom (a basidiomycete) and $Rhizobium$ is a nitrogen-fixing bacterium.
Hence the example of endomycorrhiza is $Glomus$.