There are about 700 varieties of a Selaginella plant which are often referred to as Spike Moss or Arborvitae Ferns. Selaginella plants are very diverse in their size and in the manner in which they grow. Many types of a Selaginella plant can be found growing wild in tropical America, Asia, China, Japan, North America, Mexico, South Africa and Australia. A Selaginella plant, depending upon the variety, may be a creeping, climbing, or trailing plant. Selaginella kraussiana, which is also called Spreading Club Moss or Trailing Moss, grows about ½ inch high and has a limitless spread. S. kraussiana has very small bright green leaves that overlap on trailing jointed stems. Selanginella martensii is a small bushy plant that grows about 7-9” tall and just as wide. S. martensii has thick, multi-branched stems filled with small green leaves. When S. lepidophylla, a native of desert and semi-desert regions, doesn’t get enough water, the leaves roll into tight brown balls (a phenomenon known as cespitose) and the plant becomes totally dormant. Once this Selaginella gets some moisture, the leaves open up, turn green, and the plant starts to grow again. This is why the Selaginella lepidophyllagets is called the “Resurrection Plant.” Keep an eye out for mealybugs and spider mites that can hide in the leaves.
There are several reasons why leaf tips turn brown and dry so you’ll have to pick the one that might apply to your situation: Too much fertilizer, fertilize only twice a year and dilute the food to ½ the recommended strength. Too much or too little water. Lack of humidity, place the plant on a tray of wet pebbles. Too many chemicals in the water.
Limp leaves usually mean that the plant is sitting in a cold draught. Now that the weather has changed, is there cold air coming in the window?
I’d recommend Selaginella kraussiana, another name for it is variegated trailing Spike Moss. It looks great in a hanging basket.
Some types of Selginella look more like a moss but they are really more closely relayed to ferns. Both ferns and selaginella reproduce by spores rather than seeds like most plants.
I think you might have a selaginella variety called “Aurea.” It has yellow leaves.