An editor’s footnote reveals Gramsci cited a tale from memory rather than text

Evidence

The Novellino , otherwise known as the Cento Novelle Antiche , is the earliest extant collection of Italian short stories, dating from the thirteenth century. The story in question, rather inaccurately recalled by Gramsci, is No. IX. — Antonio Gramsci, Selections from the Prison Notebooks, 2805