Pyrenula quadratolocularis
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| Pyrenula quadratolocularis | |
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Scientific classification  | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Eurotiomycetes |
| Order: | Pyrenulales |
| Family: | Pyrenulaceae |
| Genus: | Pyrenula |
| Species: | P. quadratolocularis |
| Binomial name | |
| Pyrenula quadratolocularis | |
Pyrenula quadratolocularis is a species of lichen in the family Pyrenulaceae.[1] It was first described in 2025 by Andrew J. Marshall, Peter de Lange, Dan Blanchon and André Aptroot. Endemic to the Chatham Islands of New Zealand, the species is typically found growing on Coprosma chathamica and Coprosma propinqua, on bark exposed to the elements.
The species is corticolous, has a crustose thallus, no pseudocyphellae, and is grey-white in colour, which fades to light brown or tan when stored. It can be distinguished from other members of Pyrenula due to its aggregated ascomata which are typically immersed in the thallus, curved ascospores, and square locules which range in size between 38 μm (0.0015 in) by 12 μm (0.00047 in) and 45 μm (0.0018 in) by 15 μm (0.00059 in).[2]