The genus Zelkova is in the center of our interest. Our iconographic collection of all six extant species is therefore very important for our scientific publications, books, popular articles, lectures, etc. During the last years we have visited the majority of regions and countries where natural populations of these species are growing: Sicily, Crete, Georgia, Azerbaijan, China, Taiwan, Vietnam, Japan, South Korea - as well as many botanic gardens and arboreta worldwide. Our collection includes photos of flowers, fruits, bark, leaves, habitats, etc. and counts more than 10,000 pictures.