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Polysiphonia elongata NYPL b. en Polysiphonia elongata nypl org Scan by NYPL Polysiphonia elongata Algae Photography Halstead Place Sevenoaks Spencer Collection adfcfcdabc Photographs of British algae cyanotype impressions ddadadeeaa repo nypl org PDoldauto DEFAULTSORT NYPLb Polysiphonia elongata Images uploaded by NYPLb