Acanthothecis latispora is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae.

[1] Found in Brazil, it was formally described as a new species in 2022 by Shirley Cunha Feuerstein and André da Silveira.

The type specimen was collected by the first author from Turvo State Park (Derrubadas, Rio Grande do Sul).

Its asci contain a single ascospore; the spores are densely muriform (containing multiple chambers) and measure 82–100 by 27–35 μm.

Acanthothecis latispora contains norstictic and stictic acids; these are lichen products that are detectable using thin-layer chromatography.