Lace and ferns seem to go together. Fern fronds like on the Christmas fern have such graceful arches, a great mound of green. I went around the curve of a hill and found a wrinkle where water runs after a big storm lined with large ferns. It became a favorite place to go just to admire these beautiful plants.
Polystichum acrostichoides Schott
June to October N Family: Dryopteridaceae
Sporangia: A fertile leaflet has a double row of circular sori under it. These have 64 tiny ball-shaped spores under them. The spores well and turn brown as they mature turning the entire underside of the leaflet an orange brown.
Leaf: Each compound leaf has twenty to thirty pairs of leaflets arranged alternately. Each leaflet has a prominent ‘thumb’ sticking up near the petiole. A long, single leaflet tips the petiole. Each leaflet has forked veins and toothed edges. Many of the fronds have the usual leaflets half way up then have a series of smaller, more triangular leaflets. These are the fertile leaflets with sporangia under them.
Stem: Clumps of petioles come up from various places on the rhizome. Each green petiole is grooved. The base has hair-like brown scales which look like scattered hairs higher up. The petioles can be two to three feet long.
Fiddlehead: These appear in early spring. They are light green, an inch across and covered with silvery scales that look like hairs. These turn brown as the frond unrolls past them.
Root: The perennial root is a rhizome.
Habitat: This plant prefers light shade and moist places. It is common on the slopes of ravines and wet weather water courses.
In the fall Christmas Fern leaflets turn dark green, become shorter and lie flat on the ground. These fronds stay green all winter. They were gathered and used as Christmas decorations giving the fern its common name.
During the spring and summer, Christmas ferns are among the showiest Ozark ferns. They can form large linear colonies along fold on hillsides where rain water gathers. They line the slopes of ravines and higher sections of ravine floors. They like moist areas but not wet ones.
The ‘thumb’ on the leaflets is a definite identification when coupled with the thick, green petiole. Ebony Spleenwort also sports these ‘thumbs’ but has a thin, wiry petiole and is much smaller.
Christmas ferns are available commercially. They are easy to grow in the right places. They grow well in pots.