藍藻

1. Origins, structure, and basic meaning

• Structure: The biological noun 藍藻 (らんそう) denotes cyanobacteria, traditionally called blue-green algae.
• Basic usage: A class may examine 藍藻の標本 under a microscope or diagram 藍藻の増え方.

2. Common pitfalls and similar expressions

• Traditional name and biological group
  • Despite the traditional name blue-green algae, the term refers specifically to cyanobacteria, not to plants in general.