A mild objection: This article on lichens mentioned that lichens are composed of fungi and algae, a type of protist, as if it were a given that all agree to. While it is true that the majority of taxonomists would classify an alga as a protist, there still are a large number of modern taxonomists who place algae within the kingdom Plantae. The Protista schema is certainly not yet unanimous.

Jedidiah Palossari
Dearborn, Mich.