Araucaria humboldtensis
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Araucaria humboldtensis |
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| Araucaria humboldtensis | ||||||||||||
| J.Buchholz |
Araucaria humboldtensis is a species of the genus Araucaria ( Araucaria ). It is endemic to the southern part of the New Caledonia island of Grande Terre .
description
Araucaria humboldtensis grows as an evergreen tree that can reach heights of 6 to 15 meters. The shape of the crown resembles a chandelier. The initially light brown, later gray bark flakes off in rectangular scales or in thin strips. The branches of a level are V-shaped and have a diameter of 0.8 to 1 centimeter.
On young specimens, the leaves are scaly, triangular with a length of 2.5 to 4 millimeters and a width of 2 to 3 millimeters and have a curved tip. On older specimens, the tile-like overlapping, scale-like leaves with a length of 5 to 6 millimeters and a width of 4 to 5 millimeters are keeled-ovoid with a pointed or curved upper end and a pronounced central rib.
The male cones are twisted-cylindrical in shape with a length of up to 6 centimeters and a diameter of around 1.5 centimeters. They contain triangular microsporophylls with six pollen sacs. The more or less spherical female cones have a length of around 9 centimeters and a diameter of around 8 centimeters. The seed grows to around 3 centimeters and has broad wings.
Occurrence
The natural range of Araucaria humboldtensis is in the south of the island of Grande Terre, which belongs to New Caledonia . It occurs there on the Mont Humboldt , the Mont Kouakoué , the Mont Mou and the Mont des Sources . According to unconfirmed reports, there is also a deposit near Mamie .
Araucaria humboldtensis thrives at altitudes between 750 and 1600 meters. It inhabits mountain slopes and peaks. The species grows on soils that develop on ultramafic rocks .
Systematics
Araucaria humboldtensis belongs to the section Eutacta within the genus of the Araucarias ( Araucaria ). It was first described as Araucaria humboldtensis in 1949 by John Theodore Buchholz in Bulletin du Muséum d'Histoire Naturelle , 21, p. 279.
Danger
Araucaria columnaris is listed as "critically endangered" on the IUCN Red List . Forest fires are cited as the main risk factor. Furthermore, trees are dying more and more often. The exact reasons for the death are unknown, but stress or a previously unknown disease is suspected.
swell
- Christopher J. Earle: Araucaria humboldtensis. In: The Gymnosperm Database. www.conifers.org, accessed June 2, 2011 .
Individual evidence
- ↑ a b c d e Christopher J. Earle: Araucaria humboldtensis. In: The Gymnosperm Database. www.conifers.org, accessed on August 11, 2013 .
- ↑ a b c d Araucaria humboldtensis in the endangered Red List species the IUCN 2010. Posted by: Thomas, P., 2009. Accessed August 11, 2013.
- ↑ Araucaria humboldtensis at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed August 11, 2013.
Web links
Araucaria humboldtensis. www.endemia.nc, accessed on August 11, 2013 (French, brief description, pictures and distributionmap).