Reference edition:

Anonymi Brevis Expositio Vergilii Georgicorum, in Appendix Serviana. Ceteros praeter Seruium et scholia Bernensia Vergilii commentatores continens, recensuit H. Hagen, Hildesheim 1961, pp. 191-320 (= G. Thilo et H. Hagen, Servii grammatici commentarii III.2, Leipzig 1902). 

This text is a commentary on the first two books of Vergil’s Georgics that has come down to us in four codices of the 9^th-11^th c.; Hagen published it as a work of unknown authorship, basing his text on three codices: Par. Lat. 7960 and Par. Lat. 11308, which are complete only through Verg. G. 2.91, and Leidensis BPL 135-III, which runs to the end of Georgics 2 and was earlier used by Burman as testimony for Servius.  As was first noted by Thilo 1860 and Mommsen 1861, the text has much in common with the Scholia Bernensia, which was published by Müller in 1847 and later by Hagen in 1867.  Together with the Expositiones to Vergil’s Eclogues, which are preserved in the same codices, the Brevis Expositio is one of the two early medieval recensions of late antique exegetical material that has been transmitted under the names Philargyrius / Philagrius, T. Gallus, and Fulgentius (the Scholia Bernensia represents the other recension).  Funaioli 1930 proposed assembling an edition of the late antique commentary of Philargyrius / Philagrius and T. Gallus, but the project proved unworkable (cf. Daintree and Geymonat 1988; Cadili 2003).  In 2003 Cadili published an essay on that work, which was limited to the proem and to lines 1.1-42 of the Georgics; his text is printed in parallel columns that represent the two recensions just mentioned, as well as the one found in Leidensis Voss. Lat. F 79.  For the column presenting the Brevis Expositio, Cadili collated the text of ms. Laur. plut. 45, 14 (the codex from which Poliziano knew the work of “Philargyrius”) in addition to the three codices on which Hagen had relied [F. Stok; tr. C. L. Caterine].