Common fungus causing corneal ulcer is
Aspergillus
Mucor
Fusarium
Sprothrix
Aspergillus causes respiratory diseases, disseminated aspergillosis in brain, kidney and hea, and superficial infection like sinusitis, otomycosis and mycotic keratitis. Sporothrix causes sporotrichosis - nodular ulcerative disease of the skin and subcutaneous tissue. Mucor causes pulmonary and gastrointestinal mucormycosis. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition
mycology