Platycerium alcicorne is from Africa and Madagascar. The mainland form and the Madagascan form are quite different, with the African generally much larger, and somewhat easier to grow.
Many plants are incorrectly sold as P. alcicorne, or P. 'Alcicorne'. This is another name for a P. bifurcatum cultivar, Cv. Netherlands. I believe this is the most common staghorn in the U.S.
The African form, above, formerly known as P. vassei, is a very nice staghorn. As the photo illustrates, the fertile fronds are erect, and look much like antlers. One interesting characteristic of this species is that the shield fronds begin as a beautiful, bright green, then turn chestnut shortly after maturing. This is an adaptable, easy platycerium. A good choice for growing outdoors in south Florida.
The photos above illustrate the form of P. alcicorne from Madagascar, and show the arrangement of the spore patches. The color is gray-green, more like the close up of the fertile frond.