Osmunda regalis

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tanay bose

Mar 10, 2010, 11:27:54 AM3/10/10
to efloraofindia

Plant Name: Osmunda regalis L.

Family: Osmundaceae

Date/Time- November 2008

Location- Place, Altitude, GPS- "Kali Kund" Panchmari Reserve Forest, Panchmari (Madhya Pradesh)

Habitat- Garden/ Urban/ Wild/ Type- Wild

Plant Habit- Tree/ Shrub/ Climber/ Herb- Fern, Herbaceous.

Height/Length- 1.5-2 meters

Plants form huge, light green rosettes of up to 1.5 m high under favourable conditions. Young fronds (leaves) are covered in a hairy felt as they emerge, but become hairless at maturity. The bipinnate (doubly divided) fronds are lanceolate (lance-shaped and tapering towards the tip), rather leathery and can be as large as 600-1 200 x 300-450 mm. The elongated, blunt-tipped pinnules (leaflets) have serrated edges and turn from red to green as they mature.

The fertile pinnules at the tip of each fertile frond are narrowed, clustered and apparently totally covered with sporangia (spore-bearing structures). These sporangia, which are green when young, but darken to brown at maturity, are large and not in sori (clusters of sporangia).

The erect, fertile fronds in the centre of the plant project above the outer spreading, sterile fronds.

Plants have a massive creeping rhizome (root system) and the rootstock can protrude several centimetres above the ground like a short trunk covered with leaf sheaths and roots.

Osmunda regalis is an almost cosmopolitan species. It occurs in Europe, North, Central and South America, Asia, Africa, Madagascar and the Mascarene Islands, but is not found in Australia or New Zealand. In southern Africa it is commonly found in the wetter regions and prefers areas with an annual rainfall of 400-1 200 mm per annum. It has a wide altitudinal range in southern Africa, occurring from near sea level to 2 000 m. The species is abundant in the warmer, low-altitude regions along the base of the Eastern Escarpment and becomes less frequent at higher altitudes. It often occurs in woodland and forest, but generally requires fairly high light intensity. It can form large colonies and always grows near water, along rivers and streambanks, where the rhizome is continually bathed in running water. It is less common in wet grasslands, in half to full shade, and is rarely found in open positions, on sand or gravel soils.

Derivation of name and historical aspects
The origin of this fern's name is too old to be traced. Possible derivations include the Saxon name 'Osmond' for the Germanic god Thor, or combining the Latin os (= mouth) and mundus (= clean), as it was reputedly used to clean the mouth. Another possibility is that it was named after King Osmund, who reigned over the South Saxons about 758 A.D. If this is true, the specific epithet regalis, meaning royal, would then be obvious. It may also refer to the fact that this species is very widespread in Europe, or to the stately growth of the plant.

The family Osmundaceae is an isolated and primitive group with no close relations. Osmundaceae fossils are known from as far back as the Permian (290-248 million years ago), while modern Osmunda fossils have been found in Upper Cretaceous sediments (up to 65 million years ago). The genus Osmunda comprises approximately seven species, of which only O. regalis, also the largest member of the genus, occurs in southern Africa. The only other representative of the family in southern Africa is Todea barbara.

Uses and cultural aspects
The rhizome of this plant was used as a remedy in Europe against rickets and abscesses. Patients also had to sleep on a bed made of the herbaceous parts of the plant. Poultices or emollients containing Osmunda regalis rootstock are reputedly an effective treatment for bruises, burns, sprains, broken bones and ulcers. The stem was used as an astringent and a tonic. When the root is slowly simmered in water it breaks down to a mucilaginous mass that was very popular for stiffening linen. The fibrous roots do not compact or soften easily and have long been used as a growing medium in the cultivation of orchids and other plants.

Tanay Bose
+91(033) 25550676 (Resi)
9674221362 (Mobile)

Osmunda regalis.jpg
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