SSynaptospory : a hypothesisSynaptospory : a hypothesisde K. U. KramerEdiciones (1)Synaptospory : a hypothesis (1977)Government Printing Office · inglésMás obras de K. U. KramerPPteridophytes and GymnospermsPteridophytes and GymnospermsTThe Lindsaeoid ferns of the old world v.The Lindsaeoid ferns of the old world v.TTwo new species of ferns from SurinameTwo new species of ferns from Suriname