Late Ordovician (Katian) spores in Sweden: oldest land plant remains from Baltica Badawy, Ahmed Salah ; Mehlqvist, Kristina ; Vajda, Vivi ; Ahlberg, Per ; Calner, Mikael Abstract Publication: GFF Pub Date: January 2014 DOI: 10.1080/11035897.2014.899266 Bibcode: 2014GFF...136...16B