Agathis atropurpurea
{{Short description|Species of conifer in the family Araucariaceae endemic to Queensland, Australia}}
{{Use Australian English |date=December 2022}}
{{Use dmy dates |date=December 2022}}
{{Speciesbox
|image = Agathis-atropurpurea-SF22355-05.jpg
|image_caption = In Cairns Botanic Gardens
|status = LC
|status_system = QLDNCA
|status_ref = {{R|DESQLD}}
|status2 = NT
|status2_system = IUCN3.1
|status2_ref = {{R|IUCN}}
|taxon = Agathis atropurpurea
|authority = B.Hyland{{R|APNI|POWO}}
}}
Agathis atropurpurea, commonly known as the blue kauri, and occasionally as the black kauri{{efn|name=note1|The common name "black kauri" is also one of the names that is applied to a closely related north Queensland endemic species, Agathis microstachya. For that reason this article uses "blue kauri" exclusively to avoid any potential misunderstandings}} 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 {{cvt|50|m}} in height,{{R|IUCN|FOA|TGD|TCOTW|SOA}} and a diameter of up to {{cvt|2|m}}.{{R|ALAORD}} 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.{{R|FOA|TGD|RFK}}
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 {{cvt|1|-|2|mm|2}} long.{{R|FOA}} They are lanceolate to elliptic with fine longitudinal veins, and measure up to {{cvt|7|by|2|cm|1}}.{{R|FOA|TGD}}
The male cones are cylindrical and measure up to {{cvt|16|mm|1}} long by {{cvt|7|mm|1}} wide, and are held on a peduncle about {{cvt|2|-|3|mm|2}} long. The mature female cones are green, globular, about {{cvt|5|cm|1}} in diameter with up to 150 scales.{{R|FOA|TGD|RFK}}
The seeds are tan in colour, around {{cvt|12|mm|1}} long with wings up to {{cvt|15|mm|1}} wide.{{R|TGD}}
Taxonomy
This species was first described by the Australian botanist Bernard Hyland, using specimens he collected from the Bellenden Ker Range in 1972.{{R|APNI|RFK}} 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.{{R|APNI|BRUNONIA}}
=Etymology=
The genus name Agathis is from the Ancient Greek word ἀγαθίς 'ball of thread', a reference to the appearance of the female cones.{{R|WMIC|COOPER2}} 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.{{R|COOPER2}}
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 {{cvt|2000|mm}} p.a.—at elevations from {{cvt|700|m}} to {{cvt|1600|m}}, 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.{{R|IUCN|TGD|TCOTW|RFK|AVH}}
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.{{R|IUCN|QLDRE}}
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).{{R|DESQLD}} Nor is it listed in the Queensland Confidential Species list, which seeks to limit publication of location data for at-risk species.{{R|QLDODP}}
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.{{R|IUCN}} 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
File:Agathis atropurpurea trunk Cairns Botanic Gardens January 2021 SF21001.jpg
File:Agathis-atropurpurea-SF22355-03.jpg
File:Conifer - The black kauri or blue kauri, - Agathis atropurpurea (16082593546).jpg
References
{{Reflist |refs=
{{cite web |url=https://apps.des.qld.gov.au/species-search/details/?id=18038 |title=Species profile—Agathis atropurpurea |year=2022 |website=Queensland Department of Environment and Science |publisher=Queensland Government |access-date=20 December 2022}}
{{cite web |url=https://id.biodiversity.org.au/name/apni/77721 |title=Agathis atropurpurea |website=Australian Plant Name Index (APNI) |publisher=Centre for Plant Biodiversity Research, Australian Government |access-date=20 December 2022}}
{{cite web |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:92689-1 |title=Agathis atropurpurea Hyland |website=Plants of the World Online |publisher=Royal Botanic Gardens, Kew |access-date=20 December 2022}}
{{cite web |url=https://apps.lucidcentral.org/rainforest/text/entities/Agathis_atropurpurea.htm |title=Agathis atropurpurea |author1=F.A.Zich |author2=B.P.M.Hyland |author3=T.Whiffen |author4=R.A.Kerrigan |author2-link=Bernard Hyland |year=2020 |website=Australian Tropical Rainforest Plants Edition 8 (RFK8) |publisher=Centre for Australian National Biodiversity Research (CANBR), Australian Government |access-date=20 December 2022}}
{{cite web |url=https://profiles.ala.org.au/opus/foa/profile/Agathis%20atropurpurea |title=Agathis atropurpurea |last1=Hill |first1=K.D. |year=2020 |website=Flora of Australia |publisher=Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra |access-date=20 December 2022}}
{{cite web |last1=Thomas |first1=P. |title=Agathis atropurpurea |url=https://threatenedconifers.rbge.org.uk/conifers/agathis-atropurpurea |website=Threatened Conifers of the World |publisher=Royal Botanic Garden Edinburgh |access-date=21 December 2022}}
{{cite web |title=Occurrence records download on 2022-12-22 |url=https://doi.ala.org.au/doi/322490b3-9653-4136-aad7-1ab42190c1c1 |website=Atlas of Living Australia |publisher=Australian Government |access-date=22 December 2022}}
{{cite web |title=Search: species: Agathis atropurpurea {{!}} Occurrence records {{!}} The Australasian Virtual Herbarium |url=https://avh.ala.org.au/occurrences/search?taxa=Agathis%20atropurpurea#tab_mapView |website=Australasian Virtual Herbarium |publisher=Australian Government |access-date=24 December 2022}}
{{cite web |title=Regional ecosystem details for 7.12.19 |url=https://apps.des.qld.gov.au/regional-ecosystems/details/?re=7.12.19 |website=Environment, Land and Water |publisher=Queensland Government |access-date=24 December 2022}}
{{cite web |title=Queensland Confidential Species |url=https://www.data.qld.gov.au/dataset/queensland-confidential-species/resource/7e3dcd53-4d3a-431e-b35c-d1acbc068b2a |website=Queensland Government Open Data Portal |publisher=Queensland Government |access-date=24 December 2022}}
}}
External links
{{Wikispecies}}
{{Commonscat}}
- [https://avh.ala.org.au/occurrences/search?taxa=Agathis+atropurpurea#tab_mapView View a map] of historical sightings of Agathis atropurpurea at the Australasian Virtual Herbarium
- [https://inaturalist.ala.org.au/observations?taxon_id=136853 View observations] of this species on iNaturalist
- [https://flickriver.com/search/Agathis+atropurpurea See images] of Agathis atropurpurea on Flickriver