Lagarostrobos franklinii is a species of conifer native to the wet southwestern corner of Tasmania, Australia. It is often known as the Huon pine or Macquarie pine, although it is actually a podocarp (Podocarpaceae), not a true pine (Pinaceae).[2][1] It is the sole species in the genus Lagarostrobos; one other species L. colensoi (endemic to New Zealand) formerly included has been transferred to a new genus Manoao. The genus was also formerly included in a broader circumscription of the genus Dacrydium.[3]
In molecular phylogenetic analyses Lagorostrobos was found to be related to Parasitaxus (a parasitic and monotypic genus from New Caledonia) and Manoao, but their exact relationships are unresolved.[4]
The wood is highly prized for its golden yellow colour, fine grain, and natural oils that resist rotting. The chemical giving the timber its unique smell and preservative qualities is methyl eugenol.
The Huon pine is a slow-growing, but long-lived tree; some living specimens of this tree are in excess of 2,000 years old.[6] It grows to 10 to 20 metres (33 to 66 ft) tall, exceptionally reaching 30 m (98 ft), with arching branches and pendulous branchlets. The leaves are spirally arranged, very small and scale-like, 1 to 3 mm (0.039 to 0.118 in) long, covering the shoots completely. It is dioecious, with male (pollen) and female (seed) cones on separate plants. The male cones are yellow, 5 to 8 mm (0.20 to 0.31 in) long and 1 to 2 mm (0.039 to 0.079 in) broad. The mature seed cones are highly modified, berry-like, with 5 to 10 lax, open scales which mature in six-to-eight months, with one seed 2 to 2.5 mm (0.079 to 0.098 in) long on each scale. Unlike the closely related New Zealand genus Manoao, the scales do not become fleshy and are water-dispersed, not bird-dispersed.[2]
Based on herbarium specimens the extent of occurrence is estimated to be around 13,363 km2 (5,159 sq mi) with an estimated area of occupancy of 13,363 km2 (5,159 sq mi). The actual area of occupancy is estimated to range from 2,500 ha (6,200 acres) (Gibson 1991) to as much as 10,500 ha (26,000 acres) (Parks and Wildlife Service Tasmania 2006).[1]
Age
Huon pines are some of the oldest living organisms on the Earth.
A stand of trees in excess of 10,500 years old was found in 1955 in western Tasmania on Mount Read.[7] Each of the trees in this stand is a genetically identical male that has reproduced vegetatively. Although no single tree in this stand is of that age, the stand itself as a single organism has existed that long.[8]
Individual trees in the clonal patch have been listed as having ages of 2,000[6][9] or even to 3,000[10][11] years old.
Because of the long life of individual trees, tree rings from Huon Pine have been used for dendrochronology to establish a record of climate variation.[12]
Conservation
An estimated 15% of its habitat has been lost through inundation for hydroelectric schemes and to fire over the past 100 years or so. Extensive logging in the past has removed nearly all large trees, but there is regrowth nearly everywhere. One stand of the species has been made available for access to craft wood from dead and downed timber under a strict licensing system. It is illegal to cut living trees.[1]
^Quinn, C. J. (1982). "Taxonomy of Dacrydium Sol. ex Lamb". Australian Journal of Botany. 30 (3): 311–320. doi:10.1071/bt9820311.
^Sinclair, W. T., R. R. Mill, M. F. Gardner, P. Woltz, T. Jaffré, J. Preston, M. L. Hollingsworth, A. Ponge, and M. Möller. (2002) Evolutionary Relationships of the New Caledonian Heterotrophic Conifer Parasitaxus Ustus (Podocarpaceae), Inferred from Chloroplast trnL-F Intron/Spacer and Nuclear ITS2 Sequences. Plant Systematics and Evolution 233: 79–104.
^Cris Brack and Matthew Brookhouse, Where the old things are: Australia's most ancient trees", The Conversation, April 17, 2017: "the oldest in Australia could be a Huon pine (Lagarostrobos franklinii) in Tasmania, the oldest stem of which is up to 2,000 years old." Retrieved 2018-03-22.
^Quinn, Lagarostrobos franklinii, The Gymnosperm Database, 1982: "Living trees sampled by increment borer have yielded ring counted ages of up to 2,500 years, and since these were not pith dates, it seems likely that there are living trees with ages in excess of 3,000 years (Balmer 1999)." Retrieved 2018-03-22.
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