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Cosmarium sp. (1) Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiacea

Cosmarium sp. (1) 

Following a preamble regarding similar forms, Frans Kouwets comments: "All these forms are characterized by the presence of small subapical granules that are arranged asymmetrically. In front view, the left granule is disposed slightly lower and more lateral on the semicell than the right. Related species have an additional central wart which may be poorly developed … Most interestingly, as far as known all these forms have globular zygospores, similar to that shown by Chris. The slightly larger vegetative cells shown by Chris look familiar to me but my drawings are probably in the big pile of problematic forms. I think it’s a different and possibly undescribed species." I'm grateful to Frans and Marien van Westen for help and advice with this find