Provasoli-Guillard National Center for Culture of Marine Phytoplankton (CCMP) is based at the Bigelow Marine Laboratory at Boothbay Harbor, Maine, USA. The CCMP is the living stock culture collection of marine phytoplankton for the USA. The CCMP is supported by funds from the National Science Foundation (USA) and by revenues derived by the sale of cultures. The CCMP provides to the scientific, governmental and business communities both core and special services. The core, or basic, service is to maintain important and representative living cultures and to provide these on request. The special services are provided at cost and when time allows. Special services include special orders (e.g., mass culturing, DNA extractions, frozen cells), isolating and purifying strains, visiting scientist space, and education (phytoplankton culture techniques). The CCMP holds over 2000strains. The vast majority of the strains are marine phytoplankton, but CCMP maintains a few benthic algae, a few marine macrophytes and a few freshwater microalgae. This image provided by CCMP. Image copyright: CCMP, used under license to MBL (micro*scope).