Diplotomma alboatrum is a species of lichen in the family Caliciaceae.

It was first described as Lichen alboater by German lichenologist Georg Franz Hoffmann in 1784.

[2] Julius von Flotow transferred it to the genus Diplotomma in 1849.

[3] The lichen is widely distributed, and has been recorded in Europe, North America, and Australasia.

This Caliciales-related article is a stub.