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Dryopteris crassirhizoma - Nakai.

Common Name Crown Wood-Fern
Family Dryopteridaceae
USDA hardiness 5-9
Known Hazards Although we have found no reports for this species, a number of ferns contain carcinogens so some caution is advisable[200]. The fresh plant contains thiaminase, an enzyme that robs the body of its vitamin B complex. In small quantities this enzyme will do no harm to people eating an adequate diet that is rich in vitamin B, though large quantities can cause severe health problems. The enzyme is destroyed by heat or thorough drying, so cooking the plant will remove the thiaminase[172]. However, there have been reports for other species of ferns suggesting that even cooked fronds can have a long term harmful effect. Some caution is therefore advised.
Habitats Mountains all over Japan[174]. A terrestrial fern, growing on the humus-rich floor of temperate forests, often in colonies[275].
Range E. Asia - Japan, Korea, Manchuria.
Edibility Rating    (1 of 5)
Other Uses    (0 of 5)
Weed Potential No
Medicinal Rating    (4 of 5)
Care
Fully Hardy Moist Soil Semi-shade
Dryopteris crassirhizoma Crown Wood-Fern


http://commons.wikimedia.org/wiki/User:Dalgial
Dryopteris crassirhizoma Crown Wood-Fern
http://commons.wikimedia.org/wiki/User:Dalgial

 

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Summary


Physical Characteristics

 icon of manicon of fern
Dryopteris crassirhizoma is a FERN growing to 1 m (3ft 3in).
It is hardy to zone (UK) 6.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid and neutral soils. It can grow in semi-shade (light woodland). It prefers moist soil and can tolerate drought.

UK Hardiness Map US Hardiness Map

Synonyms

Habitats

Woodland Garden Dappled Shade; Shady Edge;

Edible Uses

Edible Parts: Leaves
Edible Uses:

Young fronds[177]. No further details, but we would advise caution. See the notes above on toxicity.

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Analgesic  Depurative  Haemostatic  Resolvent  Vermifuge

The root stalks are analgesic, antibacterial, anti-inflammatory, antiviral, astringent, febrifuge, haemostatic, vermifuge and vulnerary[238, 279]. A decoction of the dried root is depurative and resolvent[218]. The root contains ‘filicin’, a substance that paralyses tapeworms and other internal parasites and has been used as a worm expellent for humans and also in veterinary medicine[218, 238]. It is one of the most effective treatments known for tapeworms - its use should be immediately followed by a non-oily purgative such as magnesium sulphate in order to expel the worms from the body[238]. An oily purge, such as caster oil, increases the absorption of the fern root and can be dangerous[238]. The root is also taken internally in the treatment of internal haemorrhage, uterine bleeding, mumps and feverish illnesses[238]. The root is harvested in the autumn and can be dried for later use, it should not be stored for longer than 12 months[238]. This remedy should be used with caution and only under the supervision of a qualified practitioner[238]. The root is toxic and the dosage is critical[238]. See also the notes above on toxicity. Externally, the root is used in the treatment of abscesses, boils, carbuncles and sores[238].

Other Uses

None known

Cultivation details

Prefers an acid to neutral soil, succeeding in ordinary fertile soil in a shady position[175, 200]. Prefers a moist soil[188], but is drought tolerant when well established[200]. Members of this genus are rarely if ever troubled by browsing deer[233].

Temperature Converter

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Propagation

Spores - can be sown at any time of the year in a greenhouse. Surface sow on a sterilised compost and keep moist, possibly by placing the pot in a plastic bag. Germinates in 1 - 3 months at 20°c. Pot up small clumps of the plants when they are large enough to handle and grow on in a shady part of the greenhouse until large enough to plant out. Division in spring. Larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring.

Other Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Dryopteris barbigera 04
Dryopteris blandfordii 04
Dryopteris carthusianaNarrow Buckler Fern, Spinulose woodfern24
Dryopteris cristataCrested Wood Fern04
Dryopteris dilatataShield Fern24
Dryopteris expansaSpiny Wood Fern, Spreading woodfern23
Dryopteris filix-masMale Fern24
Dryopteris fragransFragrant Woodfern10
Dryopteris marginalisMarginal Woodfern, Leather Wood Fern04
Dryopteris odontoloma 04
Dryopteris oreadesMountain Male Fern04
Dryopteris schimperiana 04
Dryopteris sieboldii 10

 

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Expert comment

Author

Nakai.

Botanical References

200275

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