Ocellularia subudupiensis is a rare species of corticolous (bark-dwelling) lichen in the family Graphidaceae.

[1] Found in Singapore, it was formally described as a new species in 2015 by Gothamie Weerakoon and Robert Lücking.

The type specimen was collected by the first author from a low-elevation primary forest in the Bukit Timah Nature Reserve.

The photobiont partner of the lichen is from the green algal genus Trentepohlia; their cells are yellowish-green and measure 8–12 by 6–10 μm.

The ascospores of O. subudupiensis, which number eight per ascus, are ellipsoid and hyaline, measuring 25–30 by 6–7 μm; they have between 5 and 7 septa.