See text Porella is a large, common, and widespread genus of liverworts in order Porellales.

It is a member of the family Porellaceae within that order.

There were 84 species recognized in 2016, most of them from East Asia.

[2] World Flora Online accepts 125 species,[3] and GBIF accepts 150 species (as of 4 July 2023).

[4] The genus has a wide cosmopolitan distribution in temperate areas,[4] where it is commonly found growing attached to the bark of trees.