Linked from
The 9 pages that link to Algae, each with the reason it gives.
ThallusNarrower topic: Many algae have thalli, ranging from single sheets to complex forms.
HoldfastNarrower topic: Many familiar holdfasts belong to algae, especially large seaweeds.
AphelidaRelated: Algae are prominent hosts for aphelid parasites.
Ferdinand CohnRelated: Cohn’s early botanical research focused on algae before his work on bacteria.