A dermatophytosis that results_in fungal infection located_in nail, has_material_basis_in Ascomycota fungi that belong to a group called dermatophytes, which cause separation of the nail plate from the nail bed and has_symptom thickening of subungueal area. Sometimes, white islands are seen on the external nail plates. These gradually coalesce until the entire nail plate is involved. [ url:http://en.wikipedia.org/wiki/Onychomycosis url:http://en.wikipedia.org/wiki/Nail_disease http://purl.obolibrary.org/obo/ECO_0007638 ]