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  J. RALFS: The British Desmidieae - Penium

  http://www1.biologie.uni-hamburg.de/b-online/ralfs/148.htm

  Keine Beschreibung vorhanden.

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  Zell-Zellkontakte Dr.Jastrows EM-Atlas

  http://www.uni-mainz.de/FB/Medizin/Anatomie/workshop/EM/EMZellkont.html

  Keine Beschreibung vorhanden.

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  Flora Europaea: Plantaginaceae to Compositae (and Rubiaceae) - Google Books

  https://books.google.de/books?id=QXRooltqAVMC

  Originally published between 1964 and 1980, this fourth volume is a revision of the seventh edition of Willis, with substantial amendments and additions. One distinct feature is an alphabetical list of accepted family names in this dictionary with their…

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