Cell size: Trichome, 7-8 µm in diameter; Heterocyte, 8 µm in diametr
Site of collection: Pavilion, Takamori Higashi Park (a freshwater habitat), Sendai, Japan
Date of collection: Aug. 30th 2020
Weather: Cloudy
Water temp.: 28.3°C
pH 6.5
Bright field observation using a Vixen microscope (model 108A002, Saitama, Japan) equipped with an iPhone12.
Collected from a road gutter that's unusually wet. I think maybe a house sump dumps into it.
It looked to me like there were about five types of filamentous algae. I think two of them were cyanobacteria, and these filaments were constantly in motion. This observation is for the bluish, mobile filaments.