This award will support investigators from a consortium of 50 herbaria at universities, botanical gardens, and natural history museums across the U.S. to digitize their collections of macroalgae. When they have finished, high resolution images and information about when and where each specimen was collected will be openly accessible for more than a million specimens through the consortium's web portal and the iDigBio web resource. Macroalgae are the foundation of marine, estuarine and freshwater benthic ecosystems providing food, substrata and protection for a myriad of other aquatic organisms. Many macroalgal species are sensitive to environmental change. The data provided through the portal will allow researchers and the public at large determine how macroalgal biodiversity and our aquatic ecosystems have changed over the past 150 years as a result of climate change, bioinvasions, and a wide range of human activity. <br/><br/>A number of macroalgal species, including kelp, nori, and others are grown extensively via aquaculture or harvested from the wild for human food and for extraction of colloids used in cosmetics, food products, and pharmaceuticals. The consortium's web portal will provide opportunities for the public to learn about the economic and ecological importance of macroalgae. Tools will be provided for citizen scientists to contribute to the project by helping transcribe some of the ancillary details from specimen labels into the database. Interactive exhibits and educational modules will be developed by the education departments of the museums in the consortium where hundreds of thousands of visitors will experience them each year. The project will also provide integrative training in collections and informatics research for undergraduate and graduate students through participation in the digitization effort and through internships at one of the museums. This award is made as part of the National Resource for Digitization of Biological Collections through the Advancing Digitization of Biological Collections program and all data resulting from this award will be available through the national resource (iDigBio.org).