producer Frank Spotnitz, "went through many, many incarnations and versions." Due to the episode's plot and setting, it became sardonically known as "The Killer Tree Episode" among the cast and crew. The episode's title is a biological term for the creation of cavities by separating out existing cells. Casting Katharine Isabelle, who portrayed Lisa Baiocchi, was the daughter of Graeme Murray, the production designer for The X-Files. Kate Robbins, who played Lisa's aunt Linda, had previously appeared in the third season episode "D.P.O." Chad Lindberg was cast as Bobby Rich, and when the episode was being edited, there was worry that his delivery was not pronounced enough, so many of his lines were later dubbed in a studio. David Duchovny, too, was required to overdub a line: during the scene in which Mulder tells Scully Bobby's nickname, Duchovny originally said "Dickweed". Fox's standards and practices department objected to the term and made the show change the name to "Dorkweed". Set and score While much of "Schizogeny" was filmed on a real orchard named Hazelgrove Farms near Fort Langley, British Columbia, the sinking mud scenes were shot on a soundstage at Lion's Gate Studios that was fitted with over 200 hazelnut trees. The mud pit was made out of a large tank filled with soil, Sphagnum moss, and water. The mixture was heated so that the actors would not be cold while filming. The shot that called for Karin Matthews' lifeless body to sink into the mud required a stunt woman to be slowly lowered into the pit, which necessitated the crew supplying her with oxygen, given how deep the tank was. Toby Lindala and his art department created all of the props used in the episode, including the moving tree roots and the corpse of Karin Matthews' father. Several of the shooting locations were chosen because of their proximity to large trees. Lisa's house, for instance, was next to a large willow, which was fitted with a fake tree limb twenty feet long to give it a more menacing feel. The tree limb that attacks Mulder's car was a branch from a tree that had broken off and fallen on government land. The producers secured permission from the Canadian government to retrieve the branch, and then hoisted it into the air before dropping it onto a retired police car. After the stunt, Nigel Habgood, the series' car coordinator, refurbished the