Tweet this page Like this page Email this page Share this page Home» Resources » Identification » Identification of algae » Freshwater algae » How to identify algae » Identification guide » Colonial » Cell contents (chloroplasts) are brown or golden-brown » Cells are joined by long stalks made of jelly Cells are joined by long stalks made of jelly Club or violin-shaped in valve view, wedge shaped in girdle view, much smaller than Didymosphenia; may be single stigmata at the edge of the central area; stalks commonly attach cells to the substrate. Gomphonema Club-shaped in valve view, never with swelling at wide end, wedge shaped in girdle view; central area commonly offset from widest part of the valve; commonly attached to substrates with stalks, but less abundantly than Didymosphenia. Gomphoneis Club-shaped in valve view, with swellings at both the narrow and wide ends, wedge shaped in girdle view; large; one or more (commonly 3) pores (stigmata) at the edge of the central area; gelatinous stalks often very abundant (sometimes more common than the cells). Didymosphenia