Identify fern with split frond
Last year my neighbor gave me what she calls a "fishtail fern" and it is not phased by the cold weather recently encountered here in south Alabama. However, it is nothing like the plant identified as a "fishtail fern" in the online references I searched.
The plant is a medium green, about 12-15" tall. The end of each frond is what splits into a fishtail, more like a fantail fish. The stem itself splits, and the green petals are not bi- or tri-lobed, all are straight and plain.
Does anyone have a suggestion where I might go to identify this sturdy plant? It is presently living beside my koi pond in semi shade.