The article presents the new edition of Speculum perfectionis status fratris Minoris, published by Daniele Solvi. The work was published twice by Paul Sabatier (1898 and 1928), but his editions ignored the modern principles of textual criticism, so that they were exposed to the interpretative arbitrary act of the still meritorious scholar. Solvi examines in a rigorous way the manuscript tradition by distinguishing the "vertical tradition", the "transversal tradition" and the "indirect tradition". The editor reconstructs the text taking as starting point the twelve codexes that form the "vertical tradition", bind themselves in a clear genealogy and permit the fixation of a stemma. Solvi's edition shows itself more reliable because he bears new codexes, excludes the contaminated ones and draws from the source (Compilatio Assisiensis). This last element, made possible by the progress of the studies in the last thirty years, has made possible to him the acquisition of the third branch and to close the recensio. Sabatier attributed the work to friar Leo and dated it in May 1227. Solvi, in concordance with the more recent criticism, dates the writing of Speculum around 1318 and identifies the author with an anonimous friar dwelling at the Porziuncula, who was very close to Ubertinus of Casale. Accrocca agrees with Solvi, but he considers the relationship of the compilator' work with Ubertinus of Casale less compelling than the editor thinks. [ABSTRACT FROM AUTHOR]