Doryopteris pentagona
Doryopteris pentagona is a common species on Santa Catarina Island that often grows along trails in secondary forest.

Doryopteris pentagona is a common species on Santa Catarina Island that often grows along trails in secondary forest.
Several species of Elaphoglossum have striking metallic-blue iridescent leaves. The coloration is caused by thin-film interference and may be an adaptation to low-light habitats.
Amazing pictures! This species very closes to D. riparium. Sometimes I could hardly distinguish one from another.
Thanks for mentioning that. Do you think they are synonymous? Diplazium donianum and D. bantamense are two others that I have considered. If you decide it might be something else, please let me know.