Question: Call of Cthulhu: The Wasted Land is a role-playing game in the subgenre named after what author?

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Maléfices: Maléfices (French > "Evil Acts" or "Hexes") is a French role-playing game created by Michel Gaudo and Guillaume Rohmer.  It was published by game company Jeux Descartes from 1985 to 1994 and was the first original French-language horror role-playing game.  Although it had well-crafted adventures, it lost market share to Chaosium's "Call of Cthulhu", which expanded on the fanbase that "Maléfices" itself had created.  This is ironic because Call of Cthulhu was printed earlier under license by Jeux Descartes as l'Appel de Cthulhu, starting with their translation of Chaosium's Second Edition of the rules in 1984.  In 2004 "Maléfices" was reprinted by "Editions du Club Pythagoras", which has begun making new material and sells PDFs of old material.

Trail of Cthulhu: Trail of Cthulhu is an investigative horror role-playing game published by Pelgrane Press in which the players' characters investigate mysterious events related to the Cthulhu Mythos.  It was designed by Kenneth Hite using the GUMSHOE System, which was created by Robin Laws.  "Trail of Cthulhu" is based on the "Call of Cthulhu" role playing game under license from Chaosium.

Call of Cthulhu: The Official Video Game: Call of Cthulhu: The Official Video Game is an upcoming role-playing survival horror video game developed by Cyanide and published by Focus Home Interactive for PlayStation 4, Xbox One and Windows.  The game features a semi-open world environment and will incorporate themes of Lovecraftian and psychological horror into a story which includes elements of investigation and stealth.  It is based on H. P. Lovecraft's short story "The Call of Cthulhu", while also being an adaptation of the 1981 role-playing game of the same name.

Pagan Publishing: Pagan Publishing is a role-playing game publishing company founded by John Scott Tynes in 1990.  It began by publishing a "Call of Cthulhu" role-playing game fanzine, "The Unspeakable Oath".  In 1994, the company moved from Columbia, Missouri to Seattle, Washington where it incorporated.  The staff at this time included John Tynes as editor-in-chief, John H. Crowe III as business manager, Dennis Detwiller as art director, and Brian Appleton and Chris Klepac as editors.  Tynes, Detwiller and Adam Scott Glancy released the "Delta Green" modern "Call of Cthulhu" campaign setting in 1996.  Pagan has released many other "Call of Cthulhu" products, including a foray into card games with "Creatures & Cultists" and miniature games with "The Hills Rise Wild! ".

Call of Cthulhu: The Wasted Land: Call of Cthulhu: The Wasted Land is a Lovecraftian horror tactical role-playing game developed by Red Wasp Design in conjunction with Chaosium.  The game was released in 2012, first for iOS in January, then for PC in May, and for Android in June.

Call of Cthulhu: The Card Game: Call of Cthulhu: The Card Game (formerly the Call of Cthulhu Collectible Card Game) is a card game produced and marketed by Fantasy Flight Games.  It is based on Chaosium's "Call of Cthulhu" role-playing game, the writings of H. P. Lovecraft, and other Cthulhu Mythos fiction.  In 2008, Fantasy Flight moved the game over to its Living Card Game (LCG) format, which retains the deck-building aspect of collectible card games, but without the random distribution.

Lovecraftian horror: Lovecraftian horror is a subgenre of horror fiction that emphasizes the cosmic horror of the unknown (and in some cases, unknowable) more than gore or other elements of shock, though these may still be present.  It is named after American author H. P. Lovecraft (1890–1937), who is largely credited as the first author to pioneer the genre.

Cthulhu Britannica: Cthulhu Britannica is a series of role-playing books set in the United Kingdom and produced by the British game company Cubicle 7 Entertainment.  The supplements are designed for use in the Call of Cthulhu role-playing game produced by Chaosium.

Call of Cthulhu (role-playing game): Call of Cthulhu is a horror fiction role-playing game based on H. P. Lovecraft's story of the same name and the associated Cthulhu Mythos.  The game, often abbreviated as "CoC", is published by Chaosium; it was first released in 1981 and is currently in its seventh edition, with many different versions released.  It makes use of Chaosium's Basic Role-Playing (BRP) system, with special rules for Sanity.

Cthulhu's Dark Cults: Cthulhu’s Dark Cults is an anthology edited by David Conyers, containing ten Cthulhu Mythos short stories set in Chaosium’s "Call of Cthulhu" role-playing game setting.  All the stories take place during the 1920s and 1930s, the era in which the game is set.

Supporting paragraphs: Call of Cthulhu: The Wasted Land Lovecraftian horror
Answer: H. P. Lovecraft