While it’s true that some of these forms are found in Art Nouveau letters, I’d call this a Victorian revival of Medieval Monastic Gothics. Similar pseudo-Lombardic shapes are seen in many releases from the late 1800s. Examples:
Armorial/Templar, 1879 (see L, R, H)
Tendril, 1878 (see O, L, R)
Faust Text, 1898
A very nice modern interpretation of this style is Litania (see the Lobardic alt caps).
Lumunari is another (more calligraphic) digital homage to High Middle Ages writing.