Background.

In 2011, we published an overview of Mexican freshwater algae.

Objectives.

Eleven years later, we make an evaluation of the advances in each one of the subjects related to the knowledge of the continental algal groups: number of species registered in the country and in each state of the republic, types of publications with floristic information, distribution of the taxa in the states and a list of the new species described in the period.

Methods.

The bibliographic and floristic information databases available online (bdLACET, AlgaeBase) were analyzed.

Results.

The most reliable number of records of valid taxa, no synonims, in Mexico is 4,268. Several states increased their floristic list by more than 50%.

Conclusions.

We discuss the importance of continuing with floristic work and the elements that comprise it, the role played by the current policies of scientific journals regarding inventory work, and the importance of having reliable regional databases.