Aside from Candida albicans (the most common overall), which fungal species is the second most common cause of oral fungal infection, often presenting as a black or yellow necrotic ulcer on the palate or posterior tongue?

After candidiasis, Aspergillus is the next most common oral fungal infection, typically presenting as a black/yellow necrotic ulcerative lesion, most often in immunocompromised patients. Blastomyces, Cryptococcus, and Histoplasma cause oral lesions far less frequently and are more associated with disseminated systemic disease in endemic regions.