Lemmaphyllum microphyllum is a widespread species, occurring throughout China, Korea, India, Japan, the Philippines, and Asiatic Islands. It is a wonderful epiphytic fern, whose fronds only reach about .5 inch. Fertile fronds will reach about 2? but are very narrow. It especially loves to grow on tree-fern, but cork also works well. It will grow in a pot so long as the substrate is well-drained. Like many small fern species, it is slow-growing (but not difficult).
I love this little guy and have upped my collection to four now. I’m not sure they’re happy, but they’re still alive so I have hope.
I saw yours growing outside and was very tempted to move mine outdoors 🙂 My experience with this group of ferns is that they are slow, slow, slow. And because of the resilient, waxy leaves, it’s hard to tell if they are doing well or not.