A conspectus of the native and naturalized species of Nephrolepis (Nephrolepidaceae) in the world Author Hovenkamp PH Author Miyamoto F text Blumea 2005 50 279 322 http://www.ingentaconnect.com/content/nhn/blumea/2005/00000050/00000002/art00004 journal article HovenkampMiyamoto2005 24. Nephrolepis hirsutula x N. brownii These two species are occasionally diffcult to distinguish and confusion may be due to occasional hybridization.