A volunteer from the NOAA Phytoplankton Monitoring Network’s Texas Master Naturalist group, in collaboration with National Centers for Coastal Ocean Science (NCCOS) scientists, developed an iPhone application (Phyto) to assist marine phytoplankton and harmful algae identification. This “app” includes images from an NCCOS gallery of common phytoplankton and recordings of a staff scientist’s pronunciation of each species’ name. The application also contains a flash card game to improve volunteers’ identification skills. Phyto works on both the iPod Touch and iPhone. Check the website for a description of this application, with links to a video demo and iTunes download.