The Chico State Lowell Ahart Herbarium is the most complete repository of plant specimens from northeastern California. The emphasis is on the northern California flora, and includes a great number of rare, threatened, and endangered plant species. Established with specimens donated by the late Professor Vesta Holt in the 1950's, the Herbarium now contains more than 125,000 dried and mounted specimens. The majority of samples are flowering plants, conifers, and ferns, but bryophytes, lichens, and especially slime molds, are also well represented. The Herbarium is used extensively for identification of sensitive and other plant species by various agencies and individuals. Loans of herbarium specimens are made to any higher academic institutions who request them.

Records of specimens at the University of Minnesota herbarium (MIN)

Algal collections dataset for the California Department of Food and Agriculture (CDA)

Founded in the 1920s, the Botany Lab and Herbarium of the California Department of Food and Agriculture (Plant Pest Diagnostics Center) serves as the plant diagnostic and identification service for California, and is the repository for the state collection of noxious weed and agricultural plant specimens. Size of collection: ca. 55,000 plant specimens. Notable collections include those of CDFA and County Agricultural Commissioner staff, M. K. Bellue, T. C. Fuller, G. Douglas Barbe, G. F. Hrusa, and G. L. Stout. The Gilbert L. Stout Plant Disease Herbarium (CDA-BPS) has ca. 10,000 unaccessioned specimens, integration into CDA is in progress.

Collections are available via the CCH2 Portal [https://www.cch2.org/portal/index.php]
Algae collections dataset for the California Department of Food and Agriculture - Algae (CDA) are available via the Macroalgae Portal [https://macroalgae.org/portal/index.php]
Fungi collections dataset for the California Department of Food and Agriculture - Fungi (CDA) are available via the MyCoPortal [https://www.mycoportal.org]

CITES US 241; APHIS PPQ Containment facility #889; Foreign Importation PPQ 588 P526P-20-04200 [exp 10302023]; Interstate movement PPQ 526 P526P-20-02933 [exp 07012023]; CA State Diagnostic Plant Pest Permit 2828 [exp 08312023]; CDFW CESA (2081(a)-19-011-RP) AMENDMENT 1.

The CDFA PPDC Seed Herbarium has ca. 50,000 accessions in the Seed and Fruit Collection (CDA SFC), and is curated and databased separately from CDA (curator Deborah J. Meyer, retired Volunteer). Notable collections in CDA-SFC include those of CDFA and County Agricultural Commissioner staff, M. K. Bellue, B. Crampton, P. B. Kennedy, D. Baxter, B. M. Browning, D. Decker-Walters, and C. Dremann.

The Eastern Michigan University Herbarium (EMC) provides botanical resources, research facilities, and educational opportunities to the University and broader scientific community. The herbarium seeks to continue and develop the scientific acquisition, documentation and monitoring of the plants of Michigan and the Great Lakes Region including those that are threatened, endangered and rare. The herbarium contains over 30,000 vascular plant specimens, mosses, fungi, and algae. Most specimens are from Michigan and Ontario, Canada.

La Ficoteca del Herbario USON, es una colección seca de macroalgas que incluye principalemte especímenes provenientes del Golfo de California, en especial del litoral sonorense.

Aunque se encuentra físicamente en el mismo edificio, la ficoteca funciona como una colección independiente a la de plantas vasculares, con una numeración y organización propia.

El objetivo de esta colección es conservar ejemplares de macroalgas que sirvan como respaldo de los registros de los taxones reportados para los mares de Sonora, con lo que se contribuye al conocimiento de la riqueza biológica de los ecosistemas marinos del estado, así como del patrimonio natural del país.

The Gilbert M. Smith Herbarium (GMS) consists of over 8,000 specimens collected mostly around the Monterey Peninsula, California. GMS comprises four herbarium cases of specimens, representing more than 600 species. Most of the specimens were collected at or near their type localities and were the basis for illustrations in Abbott and Hollenberg's Marine Algae of California. The primary collectors for this herbarium are Isabella A. Abbott (2,100+ specimens), Gilbert M. Smith (~1,000), George J. Hollenberg (~700), L. E. Hair (~600), James N. Norris (~400), and Wheeler J. North (~350). The physical collection is housed at Hopkins Marine Station of Stanford University. The entire collection was digitized as part of the NSF-funded Macroalgal Digitization Project.

Major collectors include the late Hendrix biology faculty member G. Thomas Clark, David M. Johnson who collected here in the 1970s, and a nice set of most of the fern species of central Arkansas collected by Don Crank in 2010. The herbaria also contains small curated collections of bryophytes, lichen, and macroalgae, databased and searchable through bryophyteportal.org, lichenportal.org, and macroalgae.org.

Miami University is the home of Ohio's largest herbarium, the Willard Sherman Turrell Herbarium. The herbarium's holdings of approximately 620,000 specimens are worldwide in both geographical and taxonomic coverage. The collection consists of 330,000 vascular plant specimens, as well as 140,000 bryophytes, 100,000 fungi, 35,000 lichens, 10,000 algae, and 5,000 fossil plants. There are several thousand type specimens contained in the collection, as well as many sets of cryptogamic exsiccatae. Active exchange programs are ongoing with many herbaria worldwide to ensure the continued breadth and depth of the collection. The W.S. Turrell Herbarium Fund is an endowment which benefits the herbarium, and is restricted to support of the research activities of the staff and students in systematic botany.

The William and Lynda Steere Herbarium of the New York Botanical Garden is the foundation of the Garden's botanical research program. All plant and fungal groups (i.e., algae, cyanobacteria, conifers, ferns, flowering plants, fungi, lichens, liverworts, and mosses) are represented by specimens collected in all parts of the world. The herbarium houses more than 7 million specimens and is the fourth largest in the world and the largest in the Western Hemisphere. The collections are augmented regularly by new accessions made by the Garden's staff, by gifts as well as by exchanges of specimens from other herbaria.

The Algae Herbarium of the New York State Museum is a small historic collection housing specimens from New York State, North America, and abroad. Collections are either pressed and mounted on herbarium sheets or preserved as permanent microscope slides.

The Putnam Museum & Science Center herbarium holds nearly 19,000 specimens. Contributions to the collection, made by approximately 450 botanists, span the years 1834 to 1989 and represent 20 countries. The herbarium is largely of North American origin (92%). Though 46 U.S. states and Washington, D.C. are represented, nearly half of the specimens are from Iowa and Illinois (48%), due to extensive collecting completed to document the flora of the Quad Cities region. Angiosperms predominate (92%), but pteridophytes (3.5%), bryophytes (2.6%), and algae (1.2%) are also present. Of the approximately 1450 genera in 314 families in the herbarium, the Asteraceae, Cyperaceae, Fabaceae, Poaceae, and Rosaceae combined make up 38% of the total.

The Chrysler Herbarium (CHRB) at Rutgers University is the last internationally recognized herbarium still in existence in the state of New Jersey (USA). Over 150,000 vascular plant and algal collections, about 7,000 moss and liverwort specimens, and 2,600 lichen specimens form our collection and are arranged and catalogued systematically. The collection is worldwide in scope, with an emphasis on New Jersey and the Mid-Atlantic area, and contains specimens back to the early 1800s. The Rutgers Mycological Herbarium (RUTPP), which is housed together with CHRB, has been estimated to contain more than 40,000 fungal collections, and has a strong focus on microfungi and plant pathogens. Dr. James White is the curator of the mycological collections, and Dr. Lena Struwe is the Director of the Chrysler Herbarium.

The San Diego State University Herbarium (SDSU) is a depository of over 25,700 vascular plant specimens and nearly 500 specimens of macroalgae. These are all used in research and teaching. The purpose of these specimens is: 1) to serve as voucher documentation for research projects; 2) to serve as resources for plant identification; and 3) to serve as exemplars in plant courses. The SDSU Herbarium both receives and provides loans of plant specimens used in active systematic research. The herbarium macroalgae collection consists of specimens from the Pacific coast of the United States and Baja California, Mexico and from the Gulf of California, Mexico, with some collections from Hawaii.

Louisiana State University Herbarium Algal Collection: approximately 50 specimens from USA.

Now part of the Beaty Biodiversity Museum. Emphasis on vascular plants of Pacific Rim countries; bryophytes of northern hemisphere; benthic marine algae of British Columbia, Washington, and Alaska.

Specialties: Worldwide; Vascular plants of Pacific Rim countries; bryophytes of northern hemisphere; benthic marine algae of British Columbia, Washington, and Alaska; macrofungi and lichens. CITES: CA 014

Notable collectors: R. Bandoni; K. I. Beamish; J. Calder; J. Davidson; J. W. Eastham; H. Kennedy; V. J. Krajina; P. Lebednik; R. Scagel; W. B. Schofield; G. B. Straley; T. M. C. Taylor

The UCSB botanical collections, housed at the Cheadle Center for Biodiversity and Ecological Restoration, include over 250,000 taxa of terrestrial and marine species. The vascular plant herbarium includes approximately 100,000 vascular plant specimens, lichens curated by Dr. Shirley Tucker, and the C.H. Muller Oak collection. The algal herbarium houses approximately 8000 specimens dating from the 1880s.

The Center for Plant Diversity herbarium at the University of California, Davis houses collections primarily of marine macroalgae and from east and west coasts of North America. It is one of four collections in the John M. Tucker Herbarium, the others being vascular, lichens, and bryophytes. Our emphasis is on California species (ca 50% of our collections).

The UCSC Marine Macroalgal Herbarium Collection contains approximately 3000 pressed marine macroalgae representing more than 500 species, with records starting from the 1960's. These specimens were primarily collected and pressed as part of the Department of Ecology and Evolutionary Biology Marine Botany Class, though a subset were collected and preserved at the Kenneth S. Norris Center for Natural History. The physical specimens are housed at the UCSC Long Marine Lab. 

Most specimens are from Santa Cruz County, Monterey County, and San Mateo County, California, USA, but some specimens are from as far north as British Columbia, Canada, and Oregon, USA. Notable collectors and contributors include Isabella Aiona Abbott, William Doyle, Julie Packard, and Vicki Pearse. 

The University of Florida Macroalgal Collection contains approximately 4,000 specimens. The overwhelming majority are from the United States and adjacent international waters. The collection includes specimens accumulated at FLAS over many decades and the Florida Fish and Wildlife Conservation Commission collection (STPE, aka Marine Research Lab, St. Petersburg, Florida) acquired in 2010. Important collections includematerial collected for a study related to the potential ecological impact of the Crystal River power plant and the Hourglass Cruises, material collected as part of a survey of the continental shelf of the Gulf of Mexico by the Marine Research Lab of the Florida Board of Conservation. The FLAS acronym is the standard international abbreviation for the University of Florida Herbarium. It is derived from the herbarium's early association with the Florida Agricultural Experiment Station.

The Albion Hodgdon Herbarium and the associated Sumner Pike Library are housed in the Spaulding Life Sciences building of the Biological Sciences Complex. The herbarium comprises approximately 200,000 specimens (120,000 vascular plants, 80,000 marine algae, and 1600 bryophytes and lichens). The herbarium contains a combination of historic and recently collected specimens, including 102 nomenclatural type specimens and voucher specimens supporting taxonomic, ecological, and biogeographic research. While our specimens represent plant species worldwide, the collections emphasize northeastern North America and are especially strong in representing freshwater and marine habitats. An additional strength is our extensive collection of Neotropical aquatic species.

The Max & Fran Hommersand Algae Herbarium is curated by the University of North Carolina at Chapel Hill Herbarium (NCU).  Note that algae collected before 1995 by Hommersand were placed in formalin. Gabrielson's non-coralline specimens are a mix; if pressed fresh this is noted on the specimen label. Gabrielson's coralline specimens were not put in formalin unless noted on the label. NCU also curates vascular plants, lichens, fungi, bryophytes, & plant fossils. NCU, located in the center of the UNC-CH campus, welcomes visitors & researchers; contact Curator for information on hours & parking. STATEMENT ON OFFENSIVE CONTENT ON SPECIMEN LABELS: Collection records at NCU may contain language that reflects historical place or taxon names in an original form that is no longer acceptable or appropriate in an inclusive environment. Because NCU preserves data in their original form to retain authenticity and facilitate research, we have chosen to facilitate conversations and are committed to address the problem of racial, derogatory and demeaning language that may be found in our database. Insensitive or offensive language is not condoned by NCU. We recognize the land and sovereignty of Native & Indigenous nations in Chapel Hill, in North Carolina, in North America, and across the world. The North Carolina Botanical Garden and the North Carolina Botanical Garden Foundation acknowledge that the story told about the history of the land we steward has been incomplete. These lands were home to multiple tribes & the ancestors of the Occaneechi Band of the Saponi Nation persist locally to this day. We recognize that at least one of the adjacent lands we steward, Mason Farm Biological Reserve, was first cleared, cultivated, & worked by Native Americans & later by African enslaved people. We invite you to reflect on our individual & community roles in knowing important & untold stories about the land we each steward.

The A. C. Moore Herbarium is an important part of the Department of Biological Sciences at the University of South Carolina (Columbia Campus). Founded in 1907 by Dr. Andrew Charles Moore, the original collection of dried plant specimens is now part of an ever-growing collection. Total holdings are just over 120,000 specimens, making the A. C. Moore Herbarium the largest in the state of South Carolina. Researchers and visitors will find a diverse collection of vascular and nonvascular plant material primarily from the Southeastern United States and more specifically from South Carolina. The phycological collection is estimated to contain 2,000 specimens. Now over 100 years old, the A. C. Moore Herbarium continues to be an indispensable resource for botanical knowledge.

Algal collections from West Virginia University.