mcgregorgb's Identifications

Photos of the same colonies with different magnifications (from left to right; x100, x200, x200, x400, and x400)

Size: see scale bars

Site of sample collection: Pavilion, Takamori Higashi Park (a freshwater habitat), Sendai, Japan

Date of sample collection: October 5th, 2024

Weather: Sunny

Water temp.: 21.8°C

pH 6.2-6.3 (pH test paper)

Date of observation: October 5th, 2024

Bright-field observation using a Wraymer microscope (model BX-3500TL, Osaka, Japan) equipped with a Floyd-2 HDMI ethernet digital camera (Wraymer, Osaka, Japan). The accuracy of the scale bar was confirmed by using a stage micrometer glass slide (1 div. = 10 µm; Wraymer, Osaka, Japan) at each magnification.

Magnification of all photos: 1000× (oil immersion)
Habitat: planktonic algae from the water column of a small pond.
Using stage micrometer for calibration, filaments estimated to be about 1.2 to 1.4 µm wide.

Cell size: 2 µm x 2 µm

Site of sample collection: Pavilion, North Pond, Katsurashima Ryokuchi (a freshwater habitat), Sendai, Japan

Date of sample collection: September 21st, 2024

Weather: Rainy

Water temp.: 22.3°C

pH 6.6

Date of observation: September 21st, 2024

Bright-field observation using a Wraymer microscope (model BX-3500TL, Osaka, Japan) equipped with a Floyd-2 HDMI ethernet digital camera (Wraymer, Osaka, Japan). The accuracy of the scale bar was confirmed by using a stage micrometer glass slide (1 div. = 10 µm; Wraymer, Osaka, Japan) at each magnification.

Magnification of first thirteen photos: 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 100×, 100×, 100×
Habitat: benthic, tangled mat, found in a drainage ditch.
Using stage micrometer for calibration, filaments estimated to range from 21 to 24 µm wide.

Magnification of photos: 1000×, 1000×, 1000×, 1000× (oil immersion), 400×
Habitat: planktonic algae from the water column of a small pond.
Using stage micrometer for calibration, filaments estimated to be up to about 1.8 µm wide.