Many bacterial species exist simply as single cells, others associate in characteristic patterns: Neisseria form diploids (pairs), Streptococcus form chains, and Staphylococcus group together in "bunch of grapes" clusters. Bacteria can also be elongated to form filaments, for example the Actinobacteria. Filamentous bacteria are often surrounded by a sheath that contains many individual cells. Certain types, such as species of the genus Nocardia, even form complex, branched filaments, similar in appearance to fungal mycelia.
What is the usual form for Neiserria bacteria? What type of bacteria is surrounded by a capsule? What well known bacteria structure chains? What does typically Staphylococcus look like? Formation of what can be related to fungal mycelia?