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The berry bladder fern (Cystopteris bulbifera, 2-3 ft.) not only likes rich moist woods but is often found clinging to limestone cliffs. A fine ground-cover for large areas, it spreads rapidly. You will know it by its tapering almost vinelike fronds, but more especially by the tiny bulblets at the base of the pinnae that drop to the ground and sprout (hence the “berry” in its common name). It also bears the more conventional fruit dots.
Bracken (Pteridium aquilinum, 3-4 ft.) which has a nice Scotch sound, does thrive in great sweeps in Scotland as well as in almost every country in the world. In England it was the basis of an old time medicine. And in rural areas many a mattress was stuffed with the fronds to prevent rickets! Bracken is an informal fern suitable for casual plantings. It is one of the most adaptable and will grow anywhere—wet, dry, sun, shade, high, low, hot, cold. Where nothing else will live the bracken fern will thrive, and spread furiously. The sporophyll edges curl under, and spore cases are hidden beneath these rolls.
The cinnamon fern (Osmunda cinnamomea, 3-5 ft.) is not only one of the loveliest ferns but also one of the easiest to grow. You will know it by the abundance of golden brown wooliness on its unwinding fronds in the spring. Also characteristic are brown wool-like hairs on the stem, a tuft of down at the base of each pinna, and several long slender lovely sporophyll during the summer. The fruiting stalk is a rich cocoa brown, erect and clustered.
The fragile fern or brittle bladder fern (Cystopteris fragilia, 5-18 in.) is not too fragile to grow the world over, even in the frigid areas of Greenland and Alaska. Thus it actually is a robust grower; the brittleness of its stems is responsible for its name. Clinging to shaded rock ledges, it also grows on the ground, and is among the first ferns to start up in the spring.
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