Our digital specimens (image data as well as textual descriptions) are available as Open Educational Resources under the CC BY-SA 4.0 license for free use and reuse with attribution to the author:
"Michael Kloster, UDE BioSLiDES (https://bioslides.biologie.uni-due.de), University of Duisburg-Essen, Germany".

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UDE BioSLiDES was developed by Dr. Michael Kloster, member of the Phycology group (Prof. Dr. Bánk Beszteri), Faculty of Biology, University of Duisburg-Essen.