| Taxon | Collector | Location | Type Status | Barcode | |
|---|---|---|---|---|---|
| Polysiphonia bostrychioides Mont. | A. F. Le Jolis s.n. s.d. | Guyana. | photo of possible type | 00900576 |  |
| Polysiphonia spinescens Mont. | F. M. R. Leprieur 1114 s.d. | French Guiana. circa Cayenne. | photo of type | 00900616 |  |
| Polysiphonia hawaiiensis Hollenb. | M. Reed 791 s.d. [probably May 1908] | United States of America. Hawaii. Oahu. | probable paratype | 00900631 |  |
| Polysiphonia woodii Harv. | L. Wood s.n. 1846 | United States of America. California. On the Pacifc coast. | photo of type | 00900665 |  |
| Polysiphonia calodictyon Harv. ex Kütz. | W. H. Harvey s.n. s.d. | Tonga. | isotype | 00922177 |  |
| Polysiphonia fastigiata (Roth) Grev. | 02421385 |  | |||
| Polysiphonia nigrescens (Huds.) Grev. ex Harv. | 02421134 |  | |||
| Polysiphonia nigrescens (Huds.) Grev. ex Harv. | 02421113 |  | |||
| Polysiphonia hystrix Hook.f. & Harv. | E. B. Gillett s.n. s.d. | Australia. | 02187419 |  | |
| Polysiphonia | Collector unknown s.n. | South Africa. Port Elizabeth. | 02221948 |  | |
| Polysiphonia | R. D. Wood s.n. 17 Jul 1947 | United States of America. Massachusetts. Barnstable Co. Woods Hole. Nobska Point. | 02221952 |  | |
| Polysiphonia | Collector unknown s.n. | Atlantic. | 02221953 |  | |
| Polysiphonia | D. Fork s.n. 13 Jul 1946 | United States of America. California. Catalina Island. | 02221954 |  | |
| Polysiphonia | E. M. Forbes s.n. s.d. | United States of America. North Carolina. Nag's Head. | 02221955 |  | |
| Polysiphonia | A. S. Bursa s.n. 22 Jun 1945 | Palestine. Atlith. | 02221956 |  | |
| Polysiphonia | E. M. Gress s.n. Aug 1910 | United States of America. New York. Long Island Sound. | 02221966 |  | |
| Polysiphonia | Collector unknown s.n. | Straits of Magellan. | 02221971 |  | |
| Polysiphonia | Collector unknown s.n. s.d. | New Zealand. | 02221973 |  | |
| Polysiphonia | Collector unknown s.n. s.d. | Jamaica. | 02221974 |  | |
| Polysiphonia | H. E. Calvert 39 05 Jul 1968 | Canada. Nova Scotia. Fink Cove (Sandy Cove). | 02221993 |  | |
| Polysiphonia | M. A. Howe 4393 11 Mar 1906 | Puerto Rico. Culebrita Island. | 02222005 |  | |
| Polysiphonia | M. A. Howe 7486 08 Jul 1915 | Puerto Rico. Muertos Island. | 02222007 |  | |
| Polysiphonia | P. O. Schallert A-13 13 Jul 1941 | United States of America. North Carolina. Dare Co. Oregon Inlet. | 02222066 |  | |
| Polysiphonia | G. P. Andrews 78 s.d. | United States of America. Hawaii. shore near Honolulu. | 02222080 |  | |
| Polysiphonia | Collector unknown s.n. s.d. | United States of America. Hawaii. Hawaiian Islands. | 02222081 |  | |
| Polysiphonia | A. R. Northrop 632 c 07 Jun 1891 | Bahamas. Crab Cay, Andros. | 02222085 |  | |
| Polysiphonia | Collector unknown s.n. Jul 1897 | United States of America. Rhode Island. Newport Co. Sachuest Point. | 02222092 |  | |
| Polysiphonia | Collector unknown s.n. Aug 1830 | Elberry Cove. | 02222094 |  | |
| Polysiphonia acroblasta Kütz. | Illegible collector name s.n. 1866 | [illegible]. | 02222110 |  | |
| Polysiphonia aculeata (C.Agardh) Fr. | Collector unknown 8 | [illegible]. | 02222111 |  | |
| Polysiphonia arachnoidea (C.Agardh) Zanardini | Collector unknown 580 | Ancona. | 02222121 |  | |
| Polysiphonia arachnoidea (C.Agardh) Zanardini | Collector unknown s.n. | Ancona. | 02222125 |  | |
| Polysiphonia arachnoidea (C.Agardh) Zanardini | Collector unknown s.n. | Ancona. | 02222126 |  | |
| Polysiphonia arctica J.Agardh | F. Johansen s.n. 14 Sep 1915 | Canada. Nunavut. Dolphin and Union Strait, Station 43c. | 02222133 |  | |
| Polysiphonia aterrima Hook.f. & Harv. | Collector unknown s.n. s.d. | New Zealand. | 02222138 |  | |
| Polysiphonia atlantica Kapraun & J.N.Norris | C. W. Schneider | C. E. Lane 02-6-22 14 Apr 2002 | Bermuda. West Whale Bay, Southampton. | 02222140 |  | |
| Polysiphonia atlantica Kapraun & J.N.Norris | C. W. Schneider 08-43-1 20 Feb 2008 | Bermuda. West Whale Bay, Southampton. | 02222141 |  | |
| Polysiphonia atrorubescens (Dillwyn) Grev. | W. C. Simmons s.n. Apr 1898 - May 1898 | United States of America. Rhode Island. Newport Co. Newport. washed ashore. | 02222142 |  | |
| Polysiphonia atrorubescens (Dillwyn) Grev. | W. C. Simmons s.n. Apr 1898 - May 1898 | United States of America. Rhode Island. Newport Co. Newport. washed ashore. | 02222143 |  | |
| Polysiphonia atrorubescens (Dillwyn) Grev. | Collector unknown 203 26 Jun 1908 | Canada. British Columbia. Vancouver Island, Departure Bay. | 02222147 |  |