Re Oberonia/Phreatia myosurus/mathewsii/cavaleriei, it is a bit of a taxonomic mess. Let me explain:
Some Oberonia and Phreatia have terete leaves (pencil round), and in the past, species have been wrongly assigned to one or the other genus.
The species epithet (e.g., the second part of a Genus-species name) myosurus belongs in the genus Phreatia. Within Phreatia, P. myosurus is a junior synonym of P. mathewsii.
In the past, the species epithet myosurus was associated with a biological species in the genus Oberonia, i.e., the species epithet myosurus was mis-applied to a species in Oberonia, instead of Phreatia.
The Oberonia species which was long wrongly called O. "myosurus", is properly referred to as O. cavaleriei.
Oberonia cavaleriei is usually sold under the moniker O. myosurus in the trade.
Is your head spinning yet? Read the above about 4 times, then it will sink in. Took me a while as well.
Your specimen looks vegetatively like O. cavaleriei. Grows intermediate to warm, may grow better potted or in basket (facultative lithophyte), officially grows in shade, but mine are in quite a bit of light (up to low Cattleya level) and still don't flower regularly, but are still dark green.
Apparently you saw my article in AOS Orchids on Misidentified orchids. For others interested, here's the reference:
Geiger, D. L. 2014. Adventures in misidentified orchids. Orchids 83(1): 174–176. pdf
If your plant flowers, I will be interested in images and possibly also preserved flowers for scanning electron microscopy. PM me. Thanks! It flowers from yellow green to salmon. Seems to be variable.
There are some other Oberonia species with terete leaves, but those I have not seen in the horticultural trade.
Have fun growing it. Can you tell me the vendor of your plant? I don't recognize the mount.
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