Dennstaedtia christophelii
... that the closest modern fern relatives to Dennstaedtia christophelii of the Pacific Northwest are tropical species from South America?
... that the closest modern fern relatives to <i id="mwAUY"><b id="mwAUc"><a href="./Dennstaedtia_christophelii" id="mwAUg" rel="mw:WikiLink" title="Dennstaedtia christophelii">Dennstaedtia christophelii</a></b></i> <i id="mwAUk">(fossil pictured)</i> of the Pacific Northwest are tropical species from South America?