Hi sunt ecclesiarum*

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Marginalia: 
A
Folio: 
231v
Sequence: 
21
Feast: 
Octava Apostolorum
Office/Mass: 
M
Genre: 
A
Position: 
3.
Cantus ID: 
202136
Mode: 
*
Addendum: 
P: 333