I saw a photo of a Phal. lindenii 'Mendenhall'--a nice little species
orchid--in Mary Noble's book "You Can Grow Phalaenopis Orchids." I
decided it was a "must have." Surprise! After searching for an hour on
the Internet, I can find many photos of this orchid, but I can't find
anyone who has one for sale. Since this is a species orchid and has
been used in crosses, I'm very surprised that it isn't widely available
in the U.S. Perhaps it is too humble for people's taste.

The varietal name 'Mendenhall' was used by a grower who lived along the border
of Southeastern Pa and Delaware. Mendenhall is a small section, not sure if it
is an incorporated borough in southern Delaware County and is divided by Rt 52.
The gentleman, I can't remember his name, who used both this varietal name and
also 'Garnet Valley' passed away a long time ago. His collection which
contained hundreds of the best examples of species orchids was sold off before
his death.

He was a contemporary of both Harold Walker and Dr. Bill Wilson along with Mrs.
Dupont of Foxcatcher Orchids.

You could contact the Delaware Orchid Society they may be able to put you in
touch with a member who might have this plant although it is a long shot. You
might also contact someone at The Little Greenhouse as they may have one of
these lindenii 'Mendenhall' available.

Sorry I could not be more help.