I have mentioned before how few algae I see here. It might be because it's dead of winter now and I started this hobby in late fall. So I have never seen this here either. I hope to find algae this spring and summer.
Common? Depends where you are.
This species is "Very common in a large number of lakes and swamps [Mich., Wis.], especially in in soft waters and acid haitats, hence often associated with desmids."
"These filament are inclosed in a broad gelatinous sheath through which fibrillar concretions radiate to the periphery."
Unfortunately neither of these is clearly visible in your images.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.
Nikon camera, lenses and objectives
Olympus microscope and objectives