Authors: Josef Pšenička, Erwin L. Zodrow & José A. D'Angelo

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Abstract: Typification of Sydneia manleyi Pšenička et al. 2003 is based entirely on fertile foliage. Of late,attached sterile-fertile segments have been found which are illustrated and described, together with cuticular preparations. A new subfamily, Sydneideae subfam. nov. is erected for the monotypytic species. The synangial chemistry is compared with marattialean synangia/sporangia from the Czech Republic and from Canada.