With all the chilliness in the air, and a touch of killing frost, the more tender species of ferns have definitely called it a season... and a year. But these ancient plants, which have been members of the flora for more than 300 million years have an elegance that remains even in the death of their fronds. I like the way their leaves and leaflets curl up and catch the cool afternoon sunlight. In short order, they'll shrivel and break apart, the leaf fragments scattered by wind and water and becoming part of the compost, next year's fertilizer to nurture new growth.