The International Symposium Biology and Taxonomy of Green Algae V was held at the Congress Centre of the Slovak Academy of Sciences in Smolenice, Slovakia, June 25–29, 2007. The symposium was attended by 61 phycologists from 19 countries of Europe (17), Asia (2) and America (4). Thirty-three lectures were given and 28 poster presentations exhibited and discussed. The scientific programme dealt with the taxonomy, ecology, physiology and genetics of green algae. One mid-symposium excursion to the Záhorie region (city of Skalica) was organized.