There are two authorities,
pange_lingua
and
pange_lingua_33325
but two of the three page scans at the former appear to belong to the latter, and the one that appears to differ, namely the one from Evangelical Lutheran Worship #355, doesn't match the incipit given, though I think it's a question of misreading the key (it's 33432 whereas the tune authority says 11217). I'm wondering if the differences between the two versions are small enough that it makes sense to merge them into a single authority. I think so, but I don't consider myself competent to judge.
Comments
PANGE LINGUA
I merged pange_lingua_33325 into pange_lingua. All three page scans for PANGE LINGUA have the same tune, they only differ in how the score looks. I'm pretty sure 11217 is the correct incipit, since the tune is modal and based on a Gregorian chant.