Polystichum manickamianum
| Polystichum manickamianum | ||||||||||||
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| Polystichum manickamianum | ||||||||||||
| Benniamin , Fraser-Jenk. & Irudayaraj |
Polystichum manickamianum is a plant from the genus of polystichum ( polystichum ) within the family of dryopteridaceae (Dryopteridaceae). It is endemic to southern India .
description
Polystichum manickamianum grows as a fern . It forms an upright and short rhizome , which is densely covered with scales at the ends and is about 8 centimeters thick.
On each rhizome there are tufts or crown-like arranged, upright-protruding fronds , which are up to 60 centimeters long. The fronds have stems around 30 centimeters long. They are dense at the base and covered with dark reddish brown scales, which are lanceolate in shape and have frayed edges. The density of the scales decreases towards the tip of the frond stalk, and these also become smaller and narrower to almost hair-like.
The two-pinnate fronds, at least in the lower frond area, are triangular-lanceolate in shape with a length of about 30 centimeters and a width of about 20 centimeters and consist of about five to twelve pairs of leaflets. The main axis of the fronds and leaflets is sparsely covered with pale brown, hair-like scales. The stiff, leathery leaflets are almost oppositely arranged on the frond stalks. The uppermost pairs of leaflets are occasionally somewhat enlarged and more pinnate-lobed. The leaflets consist of around ten to 14 pairs of dark green leaflets , which are on an approximately 0.2 centimeter long stem with a length of around 1 centimeter and a width of 0.5 to 0.75 centimeters ovate to diamond-shaped with more or less blunt tips. The upward-pointing leaflets of the lowest leaflets are sometimes enlarged and deeply lobed than the leaflets on the downward-facing side. The largest leaflets are about 10 centimeters long and about 2 centimeters wide and rectangular in shape and have a pointed tip. The base of the leaflets in the upper Wedel region forms a round, notched at the edges auricles .
The few Sori are distributed in two rows on both sides of the leaflets and are covered by a thin brown indusium , which falls off after ripening. The relatively large spores with a diameter of 45 to 48 micrometers are dark brown in color and regularly shaped.
Occurrence
The natural range of Polystichum manickamianum is in southern India . As far as is known, it comprises there a hill in the Western Ghats belonging Agasthiar Hills in the district of Tirunelveli .
Polystichum manickamianum thrives at altitudes of around 1500 meters. The species is found in shady spots in forests, where it grows along rivers.
Systematics
It was first described as Polystichum manickamianum in 2008 by Asir Benniamin , Christopher Roy Fraser-Jenkins and Varaprasatham Irudayaraj in Novon , Volume 18, Number 3, Page 289. The specific epithet manickamianum honors the botanist and plant collector Visuvasam Sousai Manickam , who collected the type material of the species .
Within the genus Polystichum is Polystichum manickamianum the section Macropolystichum assigned. The closely related species probably include Polystichum scariosum and Polystichum subinerme .
swell
- A. Benniamin, CR Fraser-Jenkins, V. Irudayaraj: Polystichum manickamianum (Dryopteridaceae), a New Species from South India . In: Novon: A Journal for Botanical Nomenclature . tape 18 , no. 3 , 2008, ISSN 1055-3177 , p. 287-293 , doi : 10.3417 / 2006082 .
Individual evidence
- ↑ a b c d e f g h A. Benniamin, CR Fraser-Jenkins, V. Irudayaraj: Polystichum manickamianum (Dryopteridaceae), a New Species from South India . In: Novon: A Journal for Botanical Nomenclature . tape 18 , no. 3 , 2008, ISSN 1055-3177 , p. 287-293 , doi : 10.3417 / 2006082 .
- ↑ Polystichum manickamianum. In: The International Plant Names Index. www.ipni.org, accessed on February 2, 2018 .