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Mag. 400x
According the to AlgaeBase, P. libellula var. intermedium is a basionym (i.e., the basis for a new designation) for the name Closterium closteroides var. intermedium https://www.algaebase.org/search/species/detail/?species_id=28157; not sure which taxonomy is correct.
A pond edge water sample (freshwater) was taken on 9/25/2021 using a 10 micron dip net to enrich for microorganisms.
Maybe?
Sample taken October 11, 2024
From a sample taken October 11, 2024 of organic fluff that accumulated on rocks, on the edge of the Sandy River.
Magnification of all photos: 1000× (oil immersion)
Habitat: muddy water from the edge of a swamp. Associated plants: Cephalanthus occidentalis
Using stage micrometer for calibration, estimated to be about 24 µm long and 19 µm wide.
Sample collected near larch mountain in a small fen. Benthic substrate is nearly all woody fluff where sample was collected
Semicells are 22 um X 12 um
Sample taken September 9, 2024 from biofilm scraped off a submerged log in Battle Ground Lake.
Collected in boggy water with peat moss. Great Meadow, Isle Au Haut, Maine, 8/24/2024.
Collected from Long Pond, Isle Au Haut, Maine, 8/23/2024. Growing on surface of shallow lake, including filamentous algae.
Sorry for the bad photo, my microscope is without a bulb.
L~35 um