|The range of Nothofagus.|
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 (Chile, Argentina) and Australasia (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. In the past, they were included in the family Fagaceae, but genetic tests revealed them to be genetically distinct, and they are now included in their own family, the Nothofagaceae.
Many individual trees are extremely old, and at one time, some populations were thought to be unable to reproduce in present-day conditions where they were growing, except by suckering (clonal reproduction), being remnant forest from a cooler time. Sexual reproduction has since been shown to be possible. Although the genus now mostly occurs in cool, isolated, high-altitude environments at temperate and tropical latitudes, the fossil record shows that it survived in climates that appear to be much warmer than those that Nothofagus now occupies.
The genus Nothofagus was first formally described in 1850 by Carl Ludwig Blume who published the description in his book Museum botanicum Lugduno-Batavum, sive, Stirpium exoticarum novarum vel minus cognitarum ex vivis aut siccis brevis expositio et descriptio.
Four sub-genera are recognized, based on morphology and DNA analysis:
- Subgenus Fuscospora, six species (N. alessandri, N. cliffortioides, N. fusca, N. gunnii, N. solandri, and N. truncata) in New Zealand, Tasmania, and southern South America.
- Subgenus Lophozonia, seven species (N. alpina, N. cunninghamii, N. glauca, N. macrocarpa, N. menziesii, N. moorei, and N. obliqua) in New Zealand, Australia, and southern South America.
- Subgenus Nothofagus, five species (N. antarctica, N. betuloides, N. dombeyi, N. nitida, and N. pumilio) in southern South America.
- Subgenus Brassospora (or Trisyngyne), 25 species (N. aequilateralis, N. balansae, N. baumanniae, N. bernhardii, N. brassii, N. carrii, N. codonandra, N. cornuta, N. crenata, N. decipiens, N. discoidea, N. dura, N. eymae, N. flaviramea, N. grandis, N. nuda, N. perryi, N. pseudoresinosa, N, pullei, N. recurva, N. resinosa, N. rubra, N. starkenborghii, N. stylosa, and N. womersleyi) in New Guinea and New Caledonia.
- Nothofagus aequilateralis (Baum.-Bod.) Steenis (New Caledonia)
- Nothofagus alessandri Espinosa (Central Chile)
- Nothofagus alpina (Poepp. & Endl.) Oerst. (Argentina South, Chile Central, Chile South)
- Nothofagus antarctica (G.Forst.) Oerst. (Argentina South, Chile Central, Chile South)
- Nothofagus balansae (Baill.) Steenis (New Caledonia)
- Nothofagus baumanniae (Baum.-Bod.) Steenis (New Caledonia)
- Nothofagus betuloides (Mirb.) Oerst. (Argentina South, Chile South)
- Nothofagus brassii Steenis (New Guinea)
- Nothofagus carrii Steenis (New Guinea)
- Nothofagus cliffortioides (Hook.f.) Oerst. (New Zealand North, New Zealand South)
- Nothofagus codonandra (Hook.f.) Oerst. (New Caledonia)
- Nothofagus crenata Steenis (New Guinea)
- Nothofagus cunninghamii (Hook.f.) Oerst. (Tasmania, Victoria)
- Nothofagus discoidea (Baum.-Bod.) Steenis (New Caledonia)
- Nothofagus dombeyi (Mirb.) Oerst. (Argentina South, Chile Central, Chile South)
- Nothofagus flaviramea Steenis (New Guinea)
- Nothofagus fusca (Hook.f.) Oerst. (New Zealand North, New Zealand South)
- Nothofagus glauca (Phil.) Krasser (Chile Central)
- Nothofagus grandis Steenis (New Guinea)
- Nothofagus gunnii (Hook.f.) Oerst. (Tasmania)
- Nothofagus macrocarpa (A.DC.) F.M.Vázquez & R.A.Rodr. (Chile Central)
- Nothofagus menziesii (Hook.f.) Oerst. (New Zealand North, New Zealand South)
- Nothofagus moorei [F.Muell.) Krasser (New South Wales, Queensland)
- Nothofagus nitida (Phil.) Krasser (Chile South)
- Nothofagus nuda Steenis (New Guinea)
- Nothofagus obliqua (Mirb.) Oerst. (Argentina South, Chile Central, Chile South)
- Nothofagus perryi Steenis (New Guinea)
- Nothofagus pseudoresinosa Steenis (New Guinea)
- Nothofagus pullei Steenis (New Guinea)
- Nothofagus pumilio (Poepp. & Endl.) Krasser (Argentina South, Chile Central, Chile South)
- Nothofagus resinosa Steenis (New Guinea)
- Nothofagus rubra Steenis (New Guinea)
- Nothofagus rutila Ravenna (Chile Central)
- Nothofagus solandri (Hook.f.) Oerst. (New Zealand North, New Zealand South)
- Nothofagus starkenborghii Steenis (Bismarck Archipelago, New Guinea)
- Nothofagus stylosa Steenis (New Guinea)
- Nothofagus truncata (Colenso) Cockayne (New Zealand North, New Zealand South)
- Nothofagus womersleyi Steenis (New Guinea)
- Nothofagus × apiculata (Colenso) Cockayne (New Zealand North, New Zealand South)
- Nothofagus × blairii Kirk (New Zealand North, New Zealand South)
- Nothofagus × dodecaphleps Mike L.Grant & E.J.Clement
- Nothofagus × eugenananus Gilland.
- Nothofagus × leoni Espinosa (Chile Central)
- Nothofagus × solfusca Allan (New Zealand North)
- Nothofagus var. crenata Steenis (New Guinea)
- Nothofagus var. sapeii Steenis (New Guinea)
In 2013, Peter Brian Heenan and Rob D. Smissen proposed splitting the genus into four, turning the four recognized subgenera into the new genera Fuscospora, Lophozonia and Trisyngyne, with the five South American species of subgenus Nothofagus remaining in genus Nothofagus. The proposed new genera are not accepted at the World Checklist of Selected Plant Families.
- Nothofagus balfourensis (Tasmania, Late Oligocene-Early Miocene)
- Nothofagus beardmorensis (Antarctica, either about 3 million or about 15 million years old)
- Nothofagus bulbosa (Tasmania, Early Oligocene)
- Nothofagus cethanica (Tasmania, Early Oligocene)
- Nothofagus cooksoniae (Tasmania, Early Oligocene)
- Nothofagus lobata (Tasmania, Early Oligocene)
- Nothofagus mucronata (Tasmania, Early Oligocene)
- Nothofagus muelleri (New South Wales, Late Eocene)
- Nothofagus novae-zealandiae (New Zealand, Mid-Late Miocene)
- Nothofagus pachyphylla (Tasmania, Early Pleistocene)
- Nothofagus palustris (New Zealand, Late Oligocene-Early Miocene)
- Nothofagus peduncularis (Tasmania, Early Oligocene
- Nothofagus robusta (Tasmania, Early Oligocene)
- Nothofagus serrata (Tasmania, Early Oligocene)
- Nothofagus smithtonensis (Tasmania, Early Oligocene)
- Nothofagus tasmanica (Tasmania, Eocene - Early Oligocene)
The pattern of distribution around the southern Pacific Rim suggests the dissemination of the genus dates to the time when Antarctica, Australia, and South America were connected in a common land-mass or supercontinent referred to as Gondwana. However, genetic evidence using molecular dating methods has been used to argue that the species in New Zealand and New Caledonia evolved from species that arrived in these landmasses by dispersal across oceans. Uncertainty exists in molecular dates and controversy rages as to whether the distribution of Nothofagus derives from the break-up of Gondwana (i.e. vicariance), or if long-distance dispersal has occurred across oceans. In South America, the northern limit of the genus can be construed as La Campana National Park and the Vizcachas Mountains in the central part of Chile. Nothofagus persisted in Antarctica deep into the Cenozoic, despite the increasingly inhospitable condiitons, with the final records from the Pliocene, around 3 million years ago, which were small tundra-adapted shrubs similar to Salix arctica.
The species of subgenus Brassospora are evergreen, and distributed in the tropics of New Guinea, New Britain, and New Caledonia. In New Guinea and New Britain Nothofagus is characteristic of lower montane rain forests between 1000 and 2500 meters elevation, occurring infrequently at elevations as low as 600 meters and in upper montane forests between 2500 and 3150 meters elevation. Nothofagus is most commonly found above the Castanopsis-Lithocarpus zone in the lower montane forests, and below the conifer-dominated upper montane forests. Nothofagus grows in mixed stands with trees of other species or in pure stands, particularly on ridge crests and upper slopes. The Central Range has the greatest diversity of species, with fewer species distributed among the mountains of western and northern New Guinea, New Britain, and Goodenough and Normanby islands.
The New Caledonian species are endemic to the main island (Grand Terre), most commonly on soils derived from ultramafic rocks between 150 to 1350 meters elevation. They occur in isolated stands, forming a low or stunted and irregular and fairly open canopy. The conifers Agathis and Araucaria are sometimes present as emergents, rising 10 to 20 meters above the Nothofagus canopy.
Every four to six years or so, Nothofagus produces a heavier crop of seeds and is known as the beech mast. In New Zealand, the beech mast causes an increase in the population of introduced mammals such as mice, rats, and stoats. When the rodent population collapses, the stoats begin to prey on native bird species, many of which are threatened with extinction. This phenomenon is covered in more detail in the article on stoats in New Zealand.
- Cyttaria, genus of ascomycete fungi found on or associated with Nothofagus
- Misodendrum, specialist parasites of Nothofagus
- Zelopsis nothofagi
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