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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                H. E. Averill 89 | 
                                12 Mar 1875 | 
                                United States of America | 
                                — | 
                                near New York | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                D. Lyall s.n. | 
                                Jan 1859 | 
                                Canada | 
                                British Columbia | 
                                Vancouver Island. Esquimalt | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                H. E. Averill s.n. | 
                                06 Mar 1877 | 
                                United States of America | 
                                New York | 
                                Queens Co. College Point | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                H. E. Averill s.n. | 
                                s.d. | 
                                United States of America | 
                                — | 
                                near New York | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                H. E. Averill s.n. | 
                                s.d. | 
                                United States of America | 
                                — | 
                                near New York | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                Collector unknown s.n. | 
                                28 Jul 1902 | 
                                — | 
                                — | 
                                Middle Sound | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                R. A. Latham 9 | 
                                05 Apr 1914 | 
                                United States of America | 
                                New York | 
                                Suffolk Co. Orient | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                R. A. Latham 11 | 
                                Aug 1916 | 
                                United States of America | 
                                New York | 
                                Suffolk Co. Orient | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                F. S. Collins s.n. | 
                                19 Apr 1903 | 
                                United States of America | 
                                Connecticut | 
                                New Haven Co. floating | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                F. S. Collins s.n. | 
                                19 Apr 1903 | 
                                United States of America | 
                                Connecticut | 
                                New Haven Co. floating | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                — | 
                                — | 
                                — | 
                                — | 
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                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. below low water… | 
                                — | 
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                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                F. S. Collins s.n. | 
                                19 Apr 1903 | 
                                United States of America | 
                                Connecticut | 
                                New Haven Co. floating | 
                                — | 
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