Micrasterias oscitans
                                                            
This is one of several specimens from Scotland collected by Alastair Bruce. Note the semi-cells are  not mirror images

                                         

                                       

This is an unnamed forma of Cosmarium tetrachondrum it is a very rare desmids found in Britain by the author for the first time in 1993 in a sample from Scotland supplied by Alan Joyce.

 

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