I've done some browsing on Gleocapsa and found out that it is unicellular. I can find them in wet mounts, ponds, moist soil, damp or wet areas. I also found out that Gleocapsa is a nitrogen fixer. My question is, since Gleocapsa is surrounded by a clear, gelatinous coating which makes one or more cells clump together within the gelatinous mass, how come we can't consider them multicellular? My second question is how can we tell that Gleocapsa is a nitrogen fixer? Many sites just say so without any explanation.