PalDat 3.0-second revision of the database, including a free online publication tool

PalDat is the world's most comprehensive pollen database. At present, the database provides about 22000 pollen pictures from more than 2500 plant species. Each dataset includes a detailed description of the pollen grain, light- and electron-microscopy images of the pollen grain, images of the plant/inflorescence/flower and relevant literature. Founded in 1997, PalDat had a major revision in 2015. The database contains tools for pollen identification and online publication. Online access to the database and data submission (www.paldat.org) are free of charge.