Английская Википедия:Agathis atropurpurea

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Agathis atropurpurea, commonly known as the blue kauri, and occasionally as the black kauriШаблон:Efn or purple kauri, is a species of conifer in the very ancient plant family Araucariaceae. The family was distributed almost worldwide during the Jurassic and Cretaceous periods, but is now mostly confined to the Southern Hemisphere. This species is endemic to a small part of northeastern Queensland, Australia.

Description

Agathis atropurpurea is a large rainforest emergent tree growing up to Шаблон:Cvt in height,Шаблон:R and a diameter of up to Шаблон:Cvt.Шаблон:R The trunk is cylindrical and very straight, with smooth to flaky bark that is mottled with dark blue, purple, and almost black patches. In very large trees the bark is brown and it may then be confused with the bull kauri, Agathis microstachya, a species that is both genetically and geographically related. However, even large specimens of the blue kauri will usually have some dark patches that enable a positive identification.Шаблон:R

The branches are more or less horizontal, and the leaf-bearing twigs are pendant. The leaves are opposite and distichous, held on very short petioles measuring Шаблон:Cvt long.Шаблон:R They are lanceolate to elliptic with fine longitudinal veins, and measure up to Шаблон:Cvt.Шаблон:R

The male cones are cylindrical and measure up to Шаблон:Cvt long by Шаблон:Cvt wide, and are held on a peduncle about Шаблон:Cvt long. The mature female cones are green, globular, about Шаблон:Cvt in diameter with up to 150 scales.Шаблон:R

The seeds are tan in colour, around Шаблон:Cvt long with wings up to Шаблон:Cvt wide.Шаблон:R

Taxonomy

This species was first described by the Australian botanist Bernard Hyland, using specimens he collected from the Bellenden Ker Range in 1972.Шаблон:R His paper, titled "A revision of the genus Agathis (Araucariaceae) in Australia", was published in 1978 in the journal Brunonia, which is now known as Australian Systematic Botany.Шаблон:R

Etymology

The genus name Agathis is from the Ancient Greek word ἀγαθίς, "ball of thread", a reference to the appearance of the female cones.Шаблон:R The species epithet atropurpurea is a combination of the Latin words āter, "dark", and purpura, "purple", and refers to the dark blue/purple colour of the bark.Шаблон:R

Distribution and habitat

The range of Agathis atropurpurea is confined to a number of small fragmented populations within the Wet Tropics of Queensland, specifically to the cloudy, high altitude, simple microphyll vine-fern forests that occur on the granite massifs north and south of Cairns. These are areas of high rainfall—more than Шаблон:Cvt p.a.—at elevations from Шаблон:Cvt to Шаблон:Cvt, and include places such as Mount Pieter Botte, Mount Lewis National Park, the Lamb Range, the Bellenden Ker Range, and the high ranges of the western Atherton Tablelands.Шаблон:R

The blue kauri favours granite and rhyolite soils, and is often associated with species such as Balanops australiana, Ceratopetalum succirubrum, Ceratopetalum virchowii, Doryphora aromatics, Elaeocarpus ferruginiflorus, Flindersia bourjotiana, Syzygium cryptophlebia, Sundacarpus amarus, Trochocarpa bellendenkerensis, Uromyrtus species, and Xanthostemon pubescens.Шаблон:R

Conservation

In the state of Queensland, to which this species is endemic, the blue kauri is officially regarded by the Department of Environment and Science (Queensland) as having no threats and is classified as least concern (LC).Шаблон:R Nor is it listed in the Queensland Confidential Species list, which seeks to limit publication of location data for at-risk species.Шаблон:R

In contrast, the International Union for Conservation of Nature (IUCN) has assessed the species as near-threatened (NT), citing invasive species, the existence of Phytophthora cinnamomi in part of the blue kauri's range, and climate change as potential threats to the species. The IUCN notes, however, that no assessment of these potential threats has been conducted, and that the population of the blue kauri is currently stable.Шаблон:R Considering that the species is already confined to the highest peaks within its range, the threat of climate change must be considered as real and imminent.

Gallery

• Файл:Agathis atropurpurea trunk Cairns Botanic Gardens January 2021 SF21001.jpg
• Файл:Agathis-atropurpurea-SF22355-03.jpg
• Файл:Conifer - The black kauri or blue kauri, - Agathis atropurpurea (16082593546).jpg
• Файл:Agathis-atropurpurea-SF22355-04.jpg

External links

• Шаблон:Wikispecies-inline
• Шаблон:Commons-inline
• View a map of historical sightings of Agathis atropurpurea at the Australasian Virtual Herbarium
• View observations of this species on iNaturalist
• See images of Agathis atropurpurea on Flickriver