The Colour Out of Space
Lovecraft pays tribute to the influence by directly incorporating some of Machen's creations and references, such as Nodens and Aklo, into his Cthulhu Mythos and using similar plotlines, most notably seen by a comparison of "The Dunwich Horror" to "The Great God Pan" and of "The Whisperer in Darkness" to "The Novel of the Black Seal". Other Lovecraft tales with a debt or reference to Machen include "The Call of Cthulhu", "The Festival", "Cool Air", "The Descendant", and "The Colour Out of Space".