In a stunning development, an historic American publishing imprint is no more: HarperCollins has announced that, well, it’s no longer HarperCollins — it’s just Harper now. The company, a division of Rupert Murdoch’s News Corp., is closing down its Collins division, according to a memo obtained by Jim Milliot of Publishers Weekly. Milliot reports that, among other things, “Steve Ross, president and publisher of Collins, and Lisa Gallagher, senior v-p, and publisher of William Morrow, are leaving the company.” That’s not the end of people being let go, however: “In addition to closing Collins, CEO Brian Murray issued a memo today saying that despite efforts to avoid layoffs, a reduction in the workforce will be necessary.” The moves come hard on the heels of the release of crushing fourth quarter reports, as per this MobyLives report from yesterday.