Dryopteris celsa Log fern

Dryopteris goldiana x D. ludoviciana. Epithet means "tall, lofty."

Deciduous to semievergreen, 3 to 4V2 ft. (90 to 135 cm). Zones 5 to 9.

description: This hybrid exhibits the shine of Dryopteris ludoviciana and the shape, albeit narrower, and cold hardiness of D. goldiana. The rhizome is short-creeping and the fronds are one-third stipe and two-thirds ovate-lanceolate pinnate-pinnatifid to almost bipinnate blades. The 15 to 20 pairs of pinnae have medial sori that are covered with kidney-shaped indusia. The fertile pinnae are not contracted.

range and habitat: This fern grows on logs as the common name implies. it is a swamp lover and thrives just above bog line in moist acidic soils from New England to the Gulf states. I find it interesting that the two parents do not currently share a common range. Moran (2004) reports that D. goldiana was forced southward by glaciation some 18,000 years ago and hybridization took place at that time. Like the glacier, D. goldiana retreated leaving behind the fertile hybrid.

culture and comments: This attractive upright fern prefers a site with rich, moist loamy soil (although a swamp is not necessary). It is smaller than its hybrid offspring, D. xaus-tralis, but offers a comparable upright visual. Dryopteris celsa is recommended for its ease of cultivation in both cold and warm climates; however, the equally nondiscriminating slugs find its tender new foliage delicious. once discouraged they will leave for better feeding grounds, ignoring the sturdier later fronds. The fronds are technically not evergreen but become procumbent and persist photosynthetically well into the arrival and early duration of cold weather. Like many east

Dryopteris celsa in the Thyrum garden. Note the gradual taper of the frond tips.

ern North American native dryopteris, it hybridizes with its genetic companions.

Dryopteris championii Champion's wood fern Synonym Dryopteris championi

Epithet is after British botanist John George Champion (1815-1854), who brought samples of 500 to 600 plant species from Hong Kong to England, thus putting an end to the myth that Hong Kong was a barren rock island. Evergreen, 2 to 3 ft. (60 to 90 cm). Zones 5 to 9. Apogamous.

description: The rhizome is erect and supports sparsely produced, airy, ovate, brilliant green bipinnate blades. The 12 to 14 pairs of pinnae are widely separated with the lowest pair thrusting sharply downwards. The greenish stipes with reddish brown scales are one-half of the frond length. The sori are at the ends of veins near the margins and covered with a kidney-shaped indusium.

range and habitat: In nature this species grows in forests in China, Japan, and Korea.

culture and comments: With its lacquered upright win-tergreen foliage, this fern is truly a highly recommended champion. Look for fronds that persist and sparkle through snowy or dreary gray days of winter as well as the contrasting sultry days of summer. The showy young crosiers are tem

Dryopteris celsa in the Thyrum garden. Note the gradual taper of the frond tips.

Dryopteris championii presents its elegant display of late-emerging but superb foliage.

porarily fleeced with juvenile silver hairs, and, be very aware, are among the very last to appear late in the spring. Give it light shade and humus in the section of the garden that can be admired through frosted winter windows and summer garden strolls.

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