A new pollen type in Old World Cucurbitaceae

Relatively small, microreticulate-gemmate acalymmate tetrads with coarsely verrucate inner nexine surfaces are described for the monotypic genus Borneosicyos. Tetrads represent a new pollen type in Old World Cucurbitaceae, while microreticulate-gemmate ornamentation and a verrucate inner nexine surface were unknown so far in the entire family.