Displaying 1 - 25 out of 47 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Acrothrix novae-angliae W.R.Taylor | W. M. Laetsch s.n. | 22 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Aegira virescens (Carmich. ex Harv.) Setch. & N.L.Gardner | W. M. Laetsch s.n. | 25 Jun 1954 | United States of America | Massachusetts | Dukes Co. Kuttyhuk Island | — |
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| Agardhiella tenera (J.Agardh) F.Schmitz | W. M. Laetsch s.n. | 08 Jul 1954 | United States of America | Massachusetts | Barnstable Co. Little Harbor | — |
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| Ascophyllum nodosum (L.) Le Jol. | W. M. Laetsch s.n. | 01 Jul 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Asperococcus echinatus (Mertens ex Roth) C.Agardh | W. M. Laetsch s.n. | 22 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Bryopsis plumosa (Huds.) C.Agardh | W. M. Laetsch s.n. | 19 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Falmouth Beach | — |
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| Ceramium Roth | W. M. Laetsch s.n. | 08 Jul 1954 | United States of America | Massachusetts | Barnstable Co. Little Harbor | — |
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| Ceramium rubrum C.Agardh | W. M. Laetsch s.n. | 08 Jul 1954 | United States of America | Massachusetts | Barnstable Co. Little Harbor | — |
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| Chaetomorpha aerea (Dillwyn) Kütz. | W. M. Laetsch s.n. | 19 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Falmouth Beach | — |
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| Chaetomorpha linum (O.F.Müll.) Kütz. | W. M. Laetsch s.n. | 22 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Champia parvula (C.Agardh) Harv. | W. M. Laetsch s.n. | 08 Jul 1954 | United States of America | Massachusetts | Barnstable Co. Little Harbor | — |
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| Chondria | W. M. Laetsch s.n. | 08 Jul 1954 | United States of America | Massachusetts | Barnstable Co. Little Harbor | — |
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| Chondrus crispus Stackh. | W. M. Laetsch s.n. | 19 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Falmouth Beach | — |
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| Chorda filum (L.) Stackh. | W. M. Laetsch s.n. | 01 Jul 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Chordaria flagelliformis (O.F.Müll.) C.Agardh | W. M. Laetsch s.n. | 22 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Chordaria flagelliformis (O.F.Müll.) C.Agardh | W. M. Laetsch s.n. | Jul 1902 | United States of America | Massachusetts | Barnstable Co. | — |
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| Cladophora | W. M. Laetsch s.n. | 22 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Cladostephus verticillatus (Lightf.) Lyngb. | W. M. Laetsch s.n. | 28 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Nobska Beach | — |
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| Cystoclonium purpureum (Huds.) Batters | W. M. Laetsch s.n. | 25 Jun 1954 | United States of America | Massachusetts | Dukes Co. Penikese Island | — |
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| Dasya pedicellata (C.Agardh) C.Agardh | W. M. Laetsch s.n. | 13 Jul 1954 | United States of America | Massachusetts | Bristol Co. Black Rock Island | — |
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| Desmarestia aculeata (L.) J.V.Lamour. | W. M. Laetsch s.n. | 22 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Dumontia incrassata (O.F.Müll.) J.V.Lamour. | W. M. Laetsch s.n. | 22 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Sandwich Beach | — |
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| Ectocarpus | W. M. Laetsch s.n. | 25 Jun 1954 | United States of America | Massachusetts | Dukes Co. Kuttyhuk Island | — |
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| Fucus spiralis L. | W. M. Laetsch s.n. | 25 Jun 1954 | United States of America | Massachusetts | Dukes Co. Penikese Island | — |
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| Gelidium crinale (Hare ex Turner) Gaillon | W. M. Laetsch s.n. | 19 Jun 1954 | United States of America | Massachusetts | Barnstable Co. Falmouth Beach | — |
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