Agathis borneensis

Agathis borneensis

Agathis borneensis is a plant of the family (Araucariaceae ). It is native to southeastern Asia.

Description

Agathis borneensis grows as a evergreen tree that can reach heights of growth of 50 to 55 meters and diameter at breast height of up to 3.5 meters. The trunk is unbeastet with mature trees up to a height of 20 to 30 meters and then ends in a wide spreading crown. The Stammborke is highly variable. It is gray, light brown to black colored, curled or thin scaly or rough. Parts of the bark from leaves.

The thick and leathery, bright green leaves are more or less elliptical, with their shape can vary greatly even on a single tree with a length of 2.5 to 14 centimeters. They are between three and ten times as long as wide. Younger trees tend to have larger leaves than old trees.

The single constant, the heyday dark brown male cones are at a 1 to 10 millimeters long stem and are at a length 3 to 4 centimeters and a thickness of 1.4 to 1.8 centimeters ovate - cylindrical in shape. They contain Mikrosporophylle with four to ten pollen sacs.

The elliptical to spherical, single standing female cones are 10 to 13 inches tall and are resinous. You are on a thick stalk, are initially green and change color to maturity towards brown.

Distribution and location

The natural range of Agathis borneensis includes the Malay Peninsula below 10 ° north latitude and the islands of Borneo and Sumatra.

The species grows in tropical rain forests and on sandy or peaty soils Kerangas at altitudes of up to 1200 meters. There she came in pure stands before, falciform frequently but also with other conifer species such as Falcatifolium, Nageia wallichiana Sundacarpus amarus as well as different types of Podocarpus ( Podocarpus ).

Agathis borneensis is classified as " critically endangered " in the IUCN Red List. The main risk is why the overuse of forests is called. Thus, the abundance of the species to more than half in the past is shrunk and is still considered to decline.

System

Agathis borneensis is allocated within the genus of kauri trees ( Agathis ) of section Agathis.

The first description was in 1900 as Agathis borneensis by Otto Warburg in Monsunia, contributions to the knowledge of the vegetation of the South and East Asian monsoon region, volume 1, page 184 synonyms for Agathis borneensis Warblers. are Agathis beccarii Warblers. , Agathis beckingii Meijer Drees, Agathis latifolia Meijer Drees, Agathis macrostachys Warblers. and Agathis rhomboidalis Warblers .. Agathis endertii also is considered by some authors because of the only slight morphological differences from Agathis borneensis a synonym of that kind.

Due to the large similarity with Agathis dammara Agathis borneensis was often confused in the past with these types.

Swell

• Christopher J. Earle: Agathis borneensis. In: The Gymnosperm Database. www.conifers.org, April 17, 2013, accessed December 27, 2013 ( English).