Nenano
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Phthora nenano is the name of one of the two "extra" modes in the Byzantine Octoechos—an eight-mode system, which was proclaimed by a synod of 792. The phthorai nenano and nana were favoured by compos
List of 7 phthorai used for transposition in a 17th-century Papadike (GB-Lbl Ms. Harley 5544, f. 5v).
"ἡ σοφωτάτη παραλλαγὴ κυρίου Ἰωάννου Ἰερέως τοῦ Πλουσιαδηνοῦ" in an 18th-century manuscript (Athos, Docheiariou monastery, Ms. 319, fol. 18v)
Chrysanthos' exegesis of the medieval apechema of phthora nenano (Chrysanthos 1832, 142—§317)
The medieval enechema of the diatonic echos plagios devteros (Chrysanthos 1832, 139)
Papadic Octoechos
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Oktōēchos is the name of the eight mode system used for the composition of religious chant in Byzantine, Syriac, Armenian, Georgian, Latin and Slavic churches since the Middle Ages. In a modified form
Nenano
…a) could end on its plagios (D) in the diatonic genus, but the chromatic phthora nenano makes it end in the plagios devteros (E). In the period of the psaltic art (gr. ψαλτικὴ τέχνη, "the art of chant", 1261–1750) the Late Byzantine Notation used four additional phthorai for each mode, including the eight diatonic…
Intonations (ἐνηχήματα) for the echoi plagios devteros, varys, and plagios tetartos listed in a 17th-century Papadike treatise—the intonations are followed by chant incipits (GB-Lbl Ms. Harley 5544, fol. 8r)
Simple Psalmody according to the first section of the Anastasimatarion of Chrysaphes the New dedicated to the echos protos—a 17th-century redaction between Papadic and modern use (GB-Lbl Ms. Harley 5544, fol. 13r)
Papadike—Koukouzelian Tree and its Use for Parallage (D-Tu Codex Chrysander, p. 15)
Papadike—κανώνιον καὶ ἡ παραλλαγή τοῦ Γαβρϊὴλ from the manuscript GR-AOh Ms. 53, fol. 3.