Dear Dr. Jayachandran
If you collect the algae with reproductive bodies, it may be easy for identification. Is it species of Oedogonium???( No caps and no oogonia were visible).
Dear Rao Sir, i got samples as mate attached to nets of fish cage at salinity of 5ppt.
Dear Dr Jayachadran 5 ppt salinity is not much problem for fresh water algae, I have seen some genera such as Chara other than baltica species and Spirogyra also in low saline regions. Marine forms such as Enteromorpha and Ulva ( both are the same based recent version) observed in estuarine regions. Thank you
K.B. Padmakumar: you have any idea on species diversity of Oedogonium in Cochin estuary? any clue to this species?
I am sure the ends of the protoplast indicates Oedogonium as earlier indicated. Even faint cap like structure can be seen in the third photo where one end of the cell is narrow. Oedogoniales monograph needs to be consulted for species.
It´s difficult to be sure that the material is Oedogonium: the typical ringlike caps are not visible and neither the pyrenoids . It´s necessary to look for these so common and evident morphological features in Oedogonium. Good luck, Célia sant´Anna
i feel rings are there and can be faintly observed at one or two points. Very clear rings are not commonly visible. Even saying absence of pyrenoids, I have my doubts.
Dear Dr. Jayachandran,
Could it be a species of Microspora ? Please check for the features as the cells are cylindrical and the cell wall showing H shape at the cell junctions; chloroplasts reticulate but without pyrenoids.
Good luck!
It is Microspora. Most of the taxonomic features of the given photomicrograph stands for Microspora, especially the cell apices of fig. No.1 (H, shaped)
Both the genera are from the Phylum Chlorophyta.
Chaetomorpha is an Ulvophycean alga coming under the Order Cladophorales with the features such as filaments uniseriate, unbranched, growth intercalary, free-living or attached basally by rhizoids; cells are cylindrical or barrel-shaped, multinucleate, with thick and stratified walls; chloroplast parietal, net-like in. appearance, with numerous pyrenoids.
Microspora is a Chlorophycean alga belonging to the Order Sphaeropleales. It is also uniseriate, unbranched and filamentous but the cells are quadrate, cylindrical or slightly swollen, sometimes constricted at cross walls, walls on occasion thick and stratified, dissociation of adjacent cells results in H-shaped fragments consisting of cross wall and adjacent portions of lateral wall; chloroplast parietal, single, usually perforated to give a net- like appearance, No pyrenoids; reproduce asexually by means of zoospores, aplanospores and akinetes.
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