This collection formed thick green carpets on rock in a flowing freshwater brook where it drained into Sam Orr’s Pond, NB (Featured Image above). The filaments are straight to slightly wavy, up to 4 cm tall, very fine and a dull to light green colour (Image A). Filaments are unbranched, the cells 5-6 µm wide by 12-26 µm tall, and contain a single parietal chloroplast that occupies only a portion of the cell wall and may lack pyrenoids (hyaline bodies are present, well developed in some cells, but inconsistent; Images B & C). Filaments are attached by a slightly modified basal cell (Image C).
Image A. Filaments of a collection from a freshwater inflow to Sam Orr’s Pond, NB (GWS044454).
Image B. View of the thin vegetative filaments and their cells, each with a single parietal chloroplast that appear to lack (indistinct?) pyrenoids (GWS044454).
Image C. Attachment is by a slightly modified basal cell (GWS044454).