Ultrastructural changes as indicators of the effectiveness of a Hyamine Quaternary compound as an algacide in controlling growth of the filamentous alga, Cladophora (chlorophyta) /$creport prepared for Limnology Section, Water Resources Branch, Ontario Ministry of the Environment ; report prepared by S.L. Wong & J.F. Wainwright Ultrastructural changes as indicators of the effectiveness of a Hyamine Quaternary compound as an algacide in controlling growth of the filamentous alga, Cladophora (chlorophyta) /$creport prepared for Limnology Section, Water Resources Branch, Ontario Ministry of the Environment ; report prepared by S.L. Wong & J.F. Wainwright