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

[1] Found in Cameroon, it is characterised its large ascomata and ascospores (for which it is named), and an inspersed hymenium.

The type specimen was discovered in the Begalanda Mountains near Nyangong Village in the Republic of Cameroon.

The lirellae of this lichen are erumpent to prominent, possessing a complete whitish thalline margin.

Its type locality is situated at an elevation of 850 m (2,790 ft) in the Begalanda Mountains near Nyangong Village, in the South Province of Cameroon.