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Mag. 200x

• A water sample taken on 03/31/2024, from a small vernal stream in a wooded area, using a small sample bottled attached to an extension pole. Air temp 46F.

Two daughter cells, still attached, of a Closterium sp,. More robustly proportioned than C. kuetzingii (fatter, but with similarly tapering and gently curved apices), a diagnosis of Closterium rostratum seems clear, as seen here http://www.digicodes.info/Closterium_rostratum.html. In the 2nd image, "N" marks the nuclear region (which will eventually become centrally located as each daughter cell matures). Also marked are the 2 chloroplasts normally found in Closterium (one per semi-cell on each side of the nuclear region). I could not find an image of a dividing C. rostratum, but a dividing C. venus, as seen here, https://www.photomacrography.net/forum/viewtopic.php?t=25375, serves as a model.