Light microscopy images (left) and corresponding epifluorescent images (right) of cultures Cochlodinium polykrikoides (CP), Akashiwo sanguinea (AS), Alexandrium fundyense (BOF), Alexandrium fundyense (NPB8), Prorocentrum minimum (PM), and Scrippsiella trochoidea (SC) hybridized with probe P442. All are vegetative cells.