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Botanical Name : Blechnum orientale Linn.
Synonym(s): Blechnopsis orientalis (L.) Presl.
English Name: Shield Fern
Local name: Pakong-alagdan (Tag.).
Habitat : Pakong-alagdan is widely distributed in the Philippines. It is also found throughout India, Ceylon, and the Malay Peninsula and extends to the Malay Islands, tropical Asia, Polynesia, and Australia.
A robust fern. Caudex stout, erect, stipes 70 cm long, bearing small auricles; fronds 150 cm long, pinnae numerous, close, oblique; sori in a long continuous line close to the midrib.
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The caudex is stout, erect and densely covered with glossy brown scales. The stipes are erect, 10 to 40 centimeters long. The fronds are 20 to 200 centimeters long and 10 to 40 centimeters wide. The pinnae are 5 to 20 centimeters long and 0.5 to 2 centimeters wide and sessile. The sori are arranged in a long continuous line close to the costre.
Constituents and properties:-
Considered anthelmintic, antiviral, contraceptive and tonic.
Phytochemistry showed essential oil, phenolic compounds and triterpenoids.
Used as poultife for boils.
Used for urinary complaints.
In China, the rhizomes are used as anthelmintic.
The Malays eat them.
In India, used for impotence; boils in infants and older children, diarrhea,
Used to stop wound bleeding.
In Malaysia, used for abscesses, blisters and sores; poultice of young leaves for furuncles and boils.
One of the plants used for fungal skin infections, esp ringworm: Plant is pounded with some kerosene and applied to affected areas. (source)
In Papua New Guinea, new fronds are eaten to induce sterility in women. (source)
• Antibacterial: Antibacterial effect could come from the bioactive constituents of essential oil, phenolic compounds and triterpenoids.Study showed antibacterial activity, greatest against P vulgaris and less with B subtilis and S aureus.
• Studies on immunomodulatory and anthelmintic properties.
• Blechnum orientale is one of the herbal components of Blechni Rhizoma, an anti-viral formulation. (souirce)
• Cytotoxicity / Breast Cancer: In vitro studies on the cytotoxic potential of three plants – Blechnum orientale, Tectaria singaporeana and Tacca integrifolia showed the roots displayed the highest cell mortality. All three plants – roots, leaves and stems – showed cytotoxic potential.
• Polyphenols / Antioxidative / Antibacterial: Study of the leaf extracts of five medicinal ferns – A aureum, Asplenium nidus, Blechnum orientale, C barometz and D linearis– showed B orientale to possess the highest amount of total polyphenols and strongest potential as antioxidant, tyrosinase inhibition and antibacterial.
Herb Effects:Antiviral, anthelmintic, female contraceptive.
According to Caius the rhizomes are used in China as an anthelmintic. Burkill reports that the Malays eat them. They also poultice boils with them. Hooper found the rhizome among drugs from Chinese pharmacies in the Straits. It seems that the Chinese use it in urinary complaints.
The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplements, it is always advisable to consult with your own health care provider.