Pit connection

In algal anatomy, a pit connection is a hole in the septum between two algal cells, and is found only in the red algae - specifically, all orders except the Porphyridiales and haploid Bangiales. They are often stoppered with proteinaceous "pit plugs". By contrast, many fungi (only ascomycetes and basidomycetes, as most other groups lack septa) contain septal pores - an unrelated phenomenon.