Putnam 1876; Wickham 1897, 1911; Howden and Cartwright 1963; Worthington and Larsen 2010; ISIC; IWUC; ELFC; DAVC; PKLC.
Collection dates: April–October.
Collected from raccoon, horse, and Canada goose dung.
County records (Figure 81): Adair, Allamakee, Appanoose, Black Hawk, Boone, Bremer, Buchanan, Cedar, Cherokee, Dallas, Davis, Decatur, Delaware, Des Moines, Dickinson, Fayette, Fremont, Hancock, Hardin, Henry, Howard, Ida, Iowa, Jackson, Jefferson, Johnson, Jones, Lee, Linn, Louisa, Lucas, Madison, Mahaska, Marion, Monona, Monroe, Muscatine, Osceola, Page, Plymouth, Polk, Pottawattamie, Scott, Story, Taylor, Van Buren, Warren, Wapello, Washington, Wayne, Winnebago, Winneshiek, Woodbury, Wright.