Here's another clue:
'Mendenhall' is a name Carter and Homes Orchids uses as a cultivar name to

After I posted my response I was out in the greenhouse watering and it suddenly
came to me. Mendenhall is the varietal name Carter and Holmes used. The
gentleman I was referring to lived in Mendenhall Pa but used the varietal name
'Chadds Ford'.

I had my fingers on the keyboard without having my brain in gear. Happens when
you get older.