The Sire - the top picture was purchased from Charles de France, the rest of them I purchased from Mark Mese and all are mounted on redwood boards. While not a rare cultivar, the offerings are sporadic at best.
Based on my experience, this staghorn can take temperatures from 40 to 90 degrees - they stay outside all year long. They prefer morning light or a dappled light all day with good air flow. The mounting medium is AAA New Zealand Sphagnum Moss and they are attached to redwood boards with 40lb monofiliment fishing line or other strapping. On these particular mountings I used the white straps (you can see them poking out just beyond the shields. Given time, they will disappear behind the shields.
Regarding fertilizing - I use either Miracle-Gro 1/4 strength or Superthrive every 3rd or 4th watering. If you have any questions or are interested in purchasing any of the Panama's shown please e-mail me at firstname.lastname@example.org.