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Helminthocladia virescens NYPL b. en Helminthocladia virescens nypl org Scan by NYPL Helminthocladia virescens Algae Photography Halstead Place Sevenoaks Spencer Collection bbcfadabc Photographs of British algae cyanotype impressions ddaaadeeaa repo nypl org PDoldauto DEFAULTSORT NYPLb Eudesme virescens Images uploaded by