From reading Wikipedia it seems that the definition is wrong in another way: Lichen don’t always have algae in them but sometimes only cyanobacteria.
Even without cyanobacteria, ‘algae’ are paraphyletic, so people are willing to forgive such usage.
From reading Wikipedia it seems that the definition is wrong in another way: Lichen don’t always have algae in them but sometimes only cyanobacteria.
Even without cyanobacteria, ‘algae’ are paraphyletic, so people are willing to forgive such usage.