Nothofagus cunninghamii | |
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Adult Foliage | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Fagales |
Family: | Nothofagaceae |
Genus: | Nothofagus |
Subgenus: | Nothofagus subg. Lophozonia |
Species: | N. cunninghamii |
Binomial name | |
Nothofagus cunninghamii | |
Synonyms | |
Lophozonia cunninghamii |
Nothofagus cunninghamii, commonly known as myrtle beech or Tasmanian myrtle, is the dominant species of cool temperate rainforests in Tasmania and Southern Victoria. It has low fire resistance and grows best in partial shade conditions.
It has rough bark covered in mosses and epiphytic growth. Its leaves are triangular-shaped, small, and dark green with differentiated margins. It has white unisexual flowers.
N. cunninghamii range from trees of up to 50 meters in protected rainforest valleys to low-growing alpine shrubs less than 1 m tall in exposed conditions. Maximum height is about 55 m. [2]
The leaves are simple and alternate, [3] growing 0.5–1.5 cm long, and in Victoria up to 2 cm (0.8 in) long. The leaves are dark green, with new growth brilliant red, pink or orange in spring. They are triangular with irregular minute teeth with craspedodromous veins with all secondary veins terminate at leaf margins and spread from a central primary midrib vein. The tertiary veins are poorly defined. [4]
The plants have separate unisexual male and female flowers on the same tree. Male flowers have hanging stamens and grow solitarily while female flowers lack stamens and cluster by leaves near the tips of branches. They flower in November and December. [5] The fruit is small (about 6 mm) and woody. They contain three small-winged nuts with fertile seeds from December to February. Seeds germinate in 6–8 weeks.
N. cunninghamii is a fairly robust species, requiring around 900 mm of rain spread throughout the year. It is also frost tolerant to –7 °C.
It can grow in full shade, albeit slowly, through to full sun, given enough water, but grows best in partial sun conditions. It grows best in moist and well-draining soil. [5]
N. cunninghamii is the dominant species in cool temperate rainforest across Tasmania and southern Victoria. [2]
It is most common in Tasmania, where it occurs in most regions except the drier Midlands and east coast. The largest remaining tract of N. cunninghamii-dominated rainforest is takayna/Tarkine in the Northwest of Tasmania. It is the largest remaining tract of cool temperate rainforest in Australia. In Victoria, N. cunninghamii grows best in the deep red mountain soils or in highly organic soils in the Central Highlands, Strzelecki Ranges, Otway Ranges, and Wilsons Promontory. [6]
The beech or Fagaceae family includes nine genera: Fagus, Nothofagus, Lithocarpus, Castanopsis, Colombobalanus, Castanea, Chrysolepis, Quercus, and Trigonobalanus. [7]
Nothofagus means “false beech” although there is some suggestion that this is due to a misspelling of the intent NOTOfagus, meaning “Southern beech.” There is a suggestion that the genus was changed due to a spelling error. [7] There are about 40 species of Nothofagus, with only three occurring in Australia: N cunninghamii, gunnii, and moorei. Nothofagus gunnii is a deciduous beech endemic to Tasmania that grows in low-fire, alpine regions. Nothofagus moorei , or Antarctic beech, is another cool temperate rainforest evergreen found in patches in New South Wales and Southern Queensland.
Nothofagus cunninghamii is named for the 19th century botanist and ‘explorer’, Allan Cunningham, who is best known for his plant collection career throughout Australia.
In 2013, N. cunninghamii was proposed to be renamed Lophozonia cunninghamii. This is due to the other species in the family Nothofagaceae with significant differences in morphology and genetics throughout South America, New Zealand, Australia, and other relict Gondwanan rainforests. [8] There has been controversy over the change in name from Nothofagus to Lophozonia with the argument that the phylogenetic history suits retaining the genus Nothofagus. [9]
Occasionally one may see round, orange-like fruiting bodies of a fungus protruding from the trunk; this is Cyttaria gunnii. Cyttaria are obligate biotrophic associates of myrtle beech and have co-evolved with Nothofagus. [10]
It grows in temperate rainforest with other rainforest species including southern sassafras ( Atherosperma moschatum ), leatherwood ( Eucryphia lucida ), horizontal (Anodopetalum biglandulosum ) and celery-top pine ( Phyllocladus aspleniifolius). [2] They also form important habitat for birds who use the tree for nesting and safety.
N. cunninghamii grow throughout a variety of ecosystems but establish best in partial sun in wet sclerophyll understory. In mixed forests, the tree species will be made up of primarily N. cunninghamii and sassafras with a tall eucalyptus overstory. Once these remaining eucalypts die, the myrtle beech will become the dominant species forming a pure rainforest. This process takes several hundred years. This ecosystem is retained by rare fires in wet conditions that prevent eucalypt seeds from germinating. In the event of a big fire, the pure rainforest will be replaced by eucalypts and the process of reestablishing a rainforest will restart. Myrtle beech rarely survives intense fire, and must re-establish from neighbouring areas. They can, however, survive light fires by regenerating from seed or vegetatively from basal epicormic shoots.[ citation needed ]
Both N. cunninghamii and the closely related N. moorei are excellent hosts for epiphytes.
Nothofagus is an ancient relict that was present in Gondwanan rainforests and today grows across the Southern Hemisphere. [2]
N. cunninghamii is most closely related to N. moorei, the other species of evergreen Nothofagus endemic to Australia. The two likely evolved from a Paleogene ancestor. Due to cooling since the Paleogene, leaves may have been pressured to evolve to smaller sizes in colder environments. This may explain the evolution toward smaller leaves than their ancestor as well as the northern boundary for N. cunnninghamii where it is replaced by the larger-leafed N. moorei in warmer Northern environments. [4]
Myrtle wilt, a parasitic fungus, (Chalara australis) attacks myrtle beech when the air or water-borne spores settle on open wounds. Myrtle wilt only infects N. cunninghamii and is a deadly pathogen that infects roots and trunks. It causes tree crown wilting and foliage to turn brown and yellow. C. australis can spread to neighbouring trees through roots, creating large patches of dead trees. Due to higher rates of root graphing, the fungus is more prolific in pure rainforest than mixed forest. Dead stands of this dominant species can completely change the ecosystem in cool temperate rainforests. [11] Infection of myrtle wilt can also increase the impact of other threats such as the ambrosia beetle (Platypus subgranosus). Ambrosia beetles bore holes into myrtles producing a dust called frass. Frass can contribute to the spread of the C. australis and increase available wounds susceptible to the fungus. [11]
Myrtle wilt is a natural disease of N. cunninghamii; research points to a low rate of mortality due to the fungus in undisturbed forest (0.61%) but drastic increase in mortality in areas with human disturbance. In recent years, myrtle wilt has become a serious problem due to poor logging practices. Rates of myrtle wilt are increased along roads, walking tracks, and logging areas likely due to decreased protection against elements, increasing the potential for injury and infection.
Temperate myrtle beech rainforests are not protected in many areas of Tasmania and are threatened by mining and logging. [12] Due to a lack of protection, these rainforest species continue to be threatened by extractive activities.
Due to their low fire resistance, myrtle beech are also threatened by wildfires of increasing intensity and frequency due to climate change. [12] Climate change also increases the threat of myrtle wilt as the fungus is more fit in warmer environments. [11]
It is an excellent cabinetry timber which is hard with strong, tough, close grain. It is a soft pink to reddish brown, often figured and can be polished to a fine sheen. It is used for flooring, joinery, cogs of wheels, and furniture, and is good for steam bending, turnery and carving. It is harvested from old growth forest but the vast majority of the timber is left on the ground as it grows with the heavily harvested mountain ash. Dry Density 700 kg/m3. [13]
It is easily grown from fresh seed, germinating in a few weeks.
Cuttings can be struck, although they tend to perform less well than seed grown plants. Cultivated specimens survive temperatures of 45 °C (113 °F) down to −7 °C (19 °F); though it is known that trees growing in the mountains can withstand lower temperatures at least to −15 °C (5 °F), and no source provenance selection has been made for cultivation from there. Trees cultivated in western Scotland are stout and hardy. [14] Examples of the species can be viewed at The Tasmanian Arboretum.
Nothofagus, also known as the southern beeches, is a genus of 43 species of trees and shrubs native to the Southern Hemisphere in southern South America and east and southeast Australia, New Zealand, New Guinea, and New Caledonia. The species are ecological dominants in many temperate forests in these regions. Some species are reportedly naturalised in Germany and Great Britain. The genus has a rich fossil record of leaves, cupules, and pollen, with fossils extending into the late Cretaceous period and occurring in Australia, New Zealand, Antarctica, and South America.
Temperate rainforests are rainforests with coniferous or broadleaf forests that occur in the temperate zone and receive heavy rain.
The Tasmanian temperate rain forests are a temperate broadleaf and mixed forests ecoregion in western Tasmania. The ecoregion is part of the Australasian realm, which includes Tasmania and Australia, New Zealand, New Guinea, New Caledonia, and adjacent islands.
Nothofagus antarctica is a deciduous tree or shrub native to southern Chile and Argentina from about 36°S to Tierra del Fuego, where it grows mainly in the diminishing temperate rainforest.
Lomatia tasmanica, commonly known as King's lomatia, is a shrub of the family Proteaceae native to Tasmania. Growing up to 8 metres (26 ft) tall, the plant has shiny green pinnate (lobed) leaves and bears red flowers in the summer, but yields neither fruit nor seeds. King's lomatia is unusual because all of the remaining plants are genetically identical clones. Because it has three sets of chromosomes and is therefore sterile, reproduction occurs only vegetatively: when a branch falls, that branch grows new roots, establishing a new plant that is genetically identical to its parent.
Nothofagus gunnii, the tanglefoot or deciduous beech, is a deciduous shrub or small tree endemic to the highlands of Tasmania, Australia. It was described in 1847 by R.C Gunn N. gunnii is a small woody tree with a shrubby appearance known to grow up to 8 metres (26 ft). It lives only on mountains due to temperature limitations within the Tasmanian maritime climate and mainly grows at altitudes greater than 800 metres (2,600 ft) above sea level. It grows in alpine and sub-alpine regions in the central portions of the island. Though capable of reaching the size of a small tree, it is most common as a thick shrub or woody ground cover, hence its common name of "tanglefoot".
Nothofagus moorei, commonly known as Antarctic beech, is an important Gondwana relict of the rainforests of the southern hemisphere. It occurs in wet, fire-free areas at high altitude in eastern Australia.
The Styx Valley is a valley located adjacent to the Tasmanian Wilderness World Heritage Area on the island of Tasmania, Australia. The Styx River is the main drainage system of the valley that lies about 100 kilometres (62 mi) northwest of Hobart, with the nearest town being Maydena.
Phyllocladus aspleniifolius, commonly known as the celerytop pine, is an endemic gymnosperm of Tasmania, Australia. It is widespread and common in Tasmania, with the most abundance in the western highlands. Its ‘leaves’ appear similar to those of a celery plant, hence the common name.
Athrotaxis cupressoides, commonly known as pencil pine, despite being a species of the family Cupressaceae and not a member of the pine family. Found either as an erect shrub or as a tree, this species is endemic to Tasmania, Australia. Trees can live for upwards of 1000 years, sustaining a very slow growth rate of approximately 12 mm in diameter per year.
Anopterus glandulosus, commonly known as native laurel or Tasmanian laurel, is a species of shrub or small tree in the family Escalloniaceae. Endemic to south and southwestern Tasmania, A. glandulosus is widespread in the moist understoreys of Tasmanian temperate rainforests and wet sclerophyll forests from sea level to mountainous regions below 1,200 metres (3,937 ft) above sea level.
Telopea truncata, commonly known as the Tasmanian waratah, is a plant in the family Proteaceae. It is endemic to Tasmania where it is found on moist acidic soils at altitudes of 600 to 1200 m (2000–4000 ft). Telopea truncata is a component of alpine eucalypt forest, rainforest and scrub communities. It grows as a multistemmed shrub to a height of 3 metres (10 ft), or occasionally as a small tree to 10 m (35 ft) high, with red flower heads, known as inflorescences, appearing over the Tasmanian summer and bearing 10 to 35 individual flowers. Yellow-flowered forms are occasionally seen, but do not form a population distinct from the rest of the species.
The biodiversity of Tasmania is of exceptional biological and paleoecological interest. A state of Australia, it is a large South Pacific archipelago of one large main island and a range of smaller islands. The terrain includes a variety of reefs, atolls, many small islands, and a variety of topographical and edaphic regions on the largest island, all of which promote the development of unusually concentrated biodiversity. During long periods geographically and genetically isolated, it is known for its unique flora and fauna. The region's climate is oceanic.
Persoonia muelleri, commonly known as Mueller’s geebung, is a shrub endemic to Tasmania. It forms a shrub in open areas of wet forests in the west and northeast of the state. It is occasionally confused with P. gunnii though it has larger flowers and longer, straighter leaves.
Cyttaria gunnii, commonly known as the myrtle orange or beech orange, is an orange-white coloured and edible ascomycete fungus native to Australia. It is a specific parasite of myrtle beech trees.
Prionotes is a genus of flowering plants endemic to Tasmania, with a single species, Prionotes cerinthoides. Commonly known as climbing heath, it is a temperate rainforest climber or a small scrambling shrub in the mountains. It usually lives in very wet, undisturbed places.
Cortinarius metallicus, originally described as Rozites metallica and commonly known as the steel blue rozites, is a species of mushroom native to Australia.
Tyromyces pulcherrimus, commonly known as the strawberry bracket, is a species of poroid fungus in the family Polyporaceae. It is readily recognisable by its reddish fruit bodies with pores on the cap underside. The fungus is found natively in Australia and New Zealand, where it causes a white rot in living and dead logs of southern beech and eucalyptus. In southern Brazil, it is an introduced species that is associated with imported eucalypts.
The Tasmanian Central Highland forests is a temperate broadleaf and mixed forests ecoregion in Australia. It covers Tasmania's Central Highlands region.
Rainforests and vine thickets are a major vegetation group in Australia. It consists of temperate to tropical rainforests, monsoon forests, and vine thickets. Rainforests and vine thickets are generally found in small pockets across the eastern and northern portions of the continent, including western Tasmania, eastern New South Wales, eastern Queensland, the northern portion of the Northern Territory, and the Kimberley Region of northeastern Western Australia.