Pyrenula parvinuclea
- kingdom: Fungi
- phylum: Ascomycota
- class: Eurotiomycetes
- order: Pyrenulales
- family: Pyrenulaceae
- genus: Pyrenula
- species: Pyrenula parvinuclea
Calle Blancos
Guadalupe
Purral
Sabanilla
San Pedro
San José
Costa Rica