[1] Found in Brazil, this species is notable for its deeply immersed ascomata (fruiting bodies) with distinctive red ostioles (openings).

[2] The type specimen of Pyrenula celaticarpa was collected from Parque Nacional Serra de Itabaiana in Areia Branca, Sergipe, Brazil, at an elevation of about 250 m (820 ft).

The ascomata are pyriform (pear-shaped), 0.6–0.9 mm in diameter, and deeply immersed in the bark beneath the thallus, with a carbonised (blackened) wall.

The ascospores are dark brown, irregularly arranged in the asci, and have diamond-shaped internal cavities separated from the wall by a thick layer.

This species is distinguished by its deeply immersed ascomata, which are only visible by the red or brown ostioles, and its unusual orange-brown thallus reaction.