Oxneriaria pakistanica is a species of saxicolous (rock-dwelling), crustose lichen in the family Megasporaceae. The species was described in 2023 by Muhammad Shahid Iqbal, Muhammad Usman, Kamran Habib, and Abdul Nasir Khalid. The specific epithet pakistanica refers to Pakistan, the country where it was discovered. Molecular phylogenetics analysis of internal transcribed spacer sequences placed O. pakistanica as sister to O. rivulicola, though it is morphologically distinct.
Oxneriaria pakistanica has a crustose, non-zonate thallus that is initially (lobate) but becomes non-placodioid with age, reaching up to 5 cm across. The are distinctly developed, uncracked, 0.5âÂÂ1.8 mm wide, and broadly attached to the . The upper surface is dull and , and whitish grey to greyish in colour. No is present.
The apothecia (fruiting bodies) are frequent, , and immersed in the thallus. They measure 0.5âÂÂ2 mm in diameter and have a black, dull . The hymenium is 100âÂÂ155 üm tall and the is 90âÂÂ170 üm deep. Ascospores are , hyaline, broadly ellipsoid to sub-spherical, and measure 10âÂÂ18 by 7âÂÂ10 üm.
Oxneriaria pakistanica is known only to occur in its type locality in the Darel Valley of Gilgit-Baltistan, Pakistan. It was found growing on calcareous sedimentary rocks in a moist temperate climate at elevations around . It is one of six Oxneriaria species known to occur in Pakistan; the others are O. crittendenii, O. iqbalii, O. kohistaniensis, and O. pruinosa.