Le fonti dell'Appendix Probi: fra tradizione erudita e latino substandard

After a methodological premise on the correct use of ancient grammat­ica! texts as evidence of late Latin language, the paper examines the fifth section of the Appendix Probi, considered in the past as a list of forms used in the spo­ken language at the time of its composition, in order to distinguish two different types of headwords: a) those containing linguistic quaestiones derived from the grammatica! tradition et related to phenomena already attested in previous ages; those that concern incorrect uses, mainly graphic, of the present. The latter are however corrected by resorting to the learned strand of the De Latinitate treatis­es, which provide the forms to be used in place of the incorrect ones.