OK, D. My turn to educate! Platycerium are Staghorn Ferns, Elkhorn Ferns, Antelope Ears. There are 18 species in the genera. All need the same cultural requirements and differ in fertile leaf shape, mostly. All want humousy soil or leaf mold (but Sphagnum is OK also.) Some of the spp include:
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andinum (deeply divided grayish green shield fronds, 2 feet or more long, with deep green lobes on upper halves and with heavy veins.
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bifurcatum The most commonly grown species (and most certainly yours.) Shield fronds are kidney shaped, Fertile fronds are grayish green segmented into 2-3 lobes, and often hang down 2-3 feet from the shield frond.
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coronarium Very wide shield fronds, fertile fronds can be as long as 12 feet. Certainly not yours!
Hopefully
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superbum Shield fronds can achieve widths of 5 feet or more! Fertile fronds relatively short (thankfully!)
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veitchii A smallish species, the shield fronds are deeply segmented (unlike yours). Shield fronds can grow to 18" wide. Fertile fronds to 24" long, much divided and covered with silky hairs.
I'm betting on bifurcatum for yours.