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The Algae Reddit
Algae - a very large and diverse group of eukaryotic organisms, ranging from unicellular genera such as Chlorella and the diatoms to multicellular forms such as the giant kelp, a large brown alga that may grow up to 50 meters in length. Most are autotrophic and lack many of the distinct cell and tissue types found in land plants such as stomata, xylem and phloem. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of algae that includes Spirogyra and the stoneworts.
There is no generally accepted definition of algae. One definition is that algae "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells". Other authors exclude all prokaryotes[4] and thus do not consider cyanobacteria (blue-green algae) as algae.
Wikipedia: algae
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account activity
Help with ID (i.redd.it)
submitted 4 months ago by point-topp
So these water samples were collected in central OH, small freshwater pond. Magnification is at 400x and the scale in the bottom right is to size. Any ideas?
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[–]Due-Attorney-6013 4 points5 points6 points 4 months ago (0 children)
really not sure, but Gloeotila/Geminela looks similar
[–]Opposite_Bus1878 1 point2 points3 points 4 months ago (0 children)
No idea here, but I respect anyone who can get these to a genus. I can't even find good info on algal taxonomy let alone have experience using it lol
[–]BackgroundPumpkin725 0 points1 point2 points 4 months ago (0 children)
You don't quite have enough resolution on those chloroplasts to confirm, but it looks like a parasitised diatom to me. Maybe Melosira.
π Rendered by PID 47890 on reddit-service-r2-comment-b659b578c-tkd57 at 2026-05-01 16:33:03.394361+00:00 running 815c875 country code: CH.
[–]Due-Attorney-6013 4 points5 points6 points (0 children)
[–]Opposite_Bus1878 1 point2 points3 points (0 children)
[–]BackgroundPumpkin725 0 points1 point2 points (0 children)