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<- L. J. Stal, Royal Netherlands Institute for Sea Research (NIOZ), the Netherlands; CCY0503. Sediment; Norway, Mountain Mauken, 500m above sea level, sub-arctic surroundings of Tromsö; sampling date: 2005. Assignment to the species Calothrix sp. is preliminary. Comment of the depositor: "Calothrix is a diazotrophic filamentous cyanobacterium. Heterocysts present". Phototrophic. It cannot be excluded that the strain produces cyanobacterial toxins that can be dangerous to humans and pets. Non-axenic. (Medium 1592, 23°C, standing culture, 16 hours at 216 lux illumination, 8-hours dark period. Transfer interval of 8 weeks).