Herpothallon viridi-isidiatum is a species of crustose lichen in the family Arthoniaceae.

Found in China, it was formally described as a new species in 2022 by Pengfei Chen and Lulu Zhang.

The type was collected from the Baiyun Protection Station (Jingning County, Zhejiang) at an altitude of almost 1,300 m (4,300 ft); here, the lichen was found growing on the bark of Cunninghamia lanceolata.

The species epithet viridi-isidiatum refers to the greenish-coloured pseudisidia.

This Arthoniomycetes-related article is a stub.