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agathis female cone

1 grudnia 2020 By Brak komentarzy

Whitmore, T. C. and C. N. Page. Veins fine and close, running lengthwise and +/- parallel to the edge of the leaf blade. Male cones about 4-10 cm long with more than 500 scales per cone, generally persisting on the ground beneath mature trees. Pollen cone 4×7-9×16 mm. Female cone of Agathis australis, Auckland, New Zealand Historical photos and products. Plant Common Name. Kirrama, Windsor Tableland and perhaps even the earlier settlements like Danbulla on the Barron River. Leaf blades about 5-13 x 1-4 cm. Among these two, A. australis, native to northern New Zealand and the most temperate species of the genus in its climate preferences, was discovered even before the island was settled and quickly became the focus of a substantial logging industry; by the time the species was described in 1829, it had been exploited for naval stores (masts and spars) for nearly 50 years (Adams 1986). CC-BY Australian Tropical Herbarium unless otherwise indicated in the images. Farjon's key is more applicable to the species discussed here but cannot be reprinted here for copyright reasons. Edited by Christopher J. Earle Stockey, R. A. and I. Atkinson. Bailey, F.M. Only female cones produce seed, which are winged and get carried on the wind after they are released. Araucaria is dioecious whereas Agathis is usually monoecious. Curtis's Botanical Magazine 19(4): 252-264. These efforts were not always successful and accounts of ring barking episodes on moonlight nights abound. Cataphylls are produced above the cotyledons and after lateral shoots are produced. Thoughout its range, Agathis is highly sought after as a source of attractive, straight-grained, easily worked timber (Whitmore 1977). Phylogenetic analysis of Araucariaceae: Integrating molecules, morphology, and fossils. Stem completely lacking buttresses. Microsporophyll head roundish, margin entire or minutely erose. Few people would call Agathis a conifer on first acquaintance, because it grows in a forest that typically contains no conifers, because of its flat and often broad, leathery leaves, and because its few cones disintegrate on the tree and are rarely seen upon the ground. In contrast to most other good-sized conifer genera, most species of Agathis form large trees; many species are the largest trees found in their respective forest ecosystems. robusta, syn. Melanesia. These cones mature 18-20 months after pollination and contain between 300 and 500 scales. A. spathulata de Laubenfels 1988, type Papua New Guinea, Morobe, Wa… New Zealand. Available: www.botanicus.org, accessed 2009.11.14. Agathis lanceolata in habitat, New Caledonia [Adam Black, 2020.02.09, Facebook post]. Work to date has shown a fairly high level of agreement in regard to the total number of taxa (19 species), a situation largely due to the high degree of endemism in the genus, though there has been a long history of lumping or splitting around the most variable and widespread species, A. dammara. Pollen is shed from the cylindrical male cones whilw the more rounded female cones are pollinated by the wind and become scaly, red-brown cones … 2013. Agathis philippinensis Araucariaceae image. Kauri is a Maori word, applied by that people to Agathis australis and generalized in modern usage to all species of Agathis (Boland et al. This shows a tree 15 cm diameter [C.J. H. Bailey) was found in May, 1964 at the nursery of the Hawaii Forestry Division at Hilo, Hawaii. Exploitation of Agathis resins also began early in New Zealand. Cuticle micromorphology of Agathis Salisbury. The distribution of most taxa is confined to a relatively limited space within the vast archipelago reaching from Sumatra and the Philippines to New Zealand, that comprises the genus' range. Many megasporophylls are present around the apex of the monopodial trunk of the female plant above each crown of foliage and scaly leaves (Fig. It would be more fair, though, to say that two species, A. australis and A. dammara, stood for the whole genus during most of the time between discovery and 1900. New Caledonia. Kauri is a Maori word, applied by that people to Agathis australis and generalized in modern usage to all species of Agathis (Boland et al. Agathis primarily grows as a minor component of relatively inaccessible tropical forests, and most of the species resemble each other very closely. Rumphius, G. E. 1741. // End -->, Head of microsporophyll with a distinct umbo, tessellately arranged in the cone. AGATHIS robusta. The crown is dense, but often small in forest-grown trees, becoming more elongate when trees grow in the open. New South Wales National Parks and Wildlife Service. Exudate slow and meagre. These accounts appear to be based on fact and as a result the Forestry Department was forced to allow the logging of trees which would otherwise die and rot in the forest. Examination of several thousand other fallen male cones from 25 trees failed to turn up another that was … globose to ovoid). 1993. Microsporophyll head 1.5-2 mm diameter at anthesis. The Coming of the Kauris. A. dammara, on the other hand, stands for the first Agathis to attract European attention. New Guinea. These two botanists described most of the species now recognized, established that the principal taxonomic characters in the genus concern those of the pollen cone, and showed that most of the species have geographically separate distributions. Agathis philippinensis Araucariaceae image. Pollen cone basal bracts to 4x20 mm; seed cone scales lacking a boss on the upper margin. Most of these analyses were based largely on morphology of the pollen cone and leaf cuticle, as foliar morphology is highly variable and female cones, which disintegrate upon drying, are seldom preserved (Whitmore 1980). Bark smooth and light grey to reddish, peeling with large thin irregular flakes that thicken on larger trees, leaving a pitted somewhat rough reddish brown surface, emits a milky sap when punctured. Nearly mature female cone from an Agathis robusta tree in Yatton Park, New Zealand [C.J. When most of the logs were being shipped out of Cairns and when the only reliable transport of logs to Cairns was by rail, an upper size limit had to be set on logs (mainly Kauri Pine logs) so that the rail wagons would fit through the tunnels on the Kuranda Range. In spring, male and female cones appear in the same tree (although young trees tend to be one-gendered at first). Stairs carved into an ancient kauri trunk (Ancient Kauri Museum, Awanui, near Kaitaia, Northland, New Zealand) Gum from a … Radial symmetry in new terminal growth on Agathis corbassonii in New Caledonia [Adam Black, 2014.06.01, Facebook post]. Taxa presented in this treatment include the following: Evergreen trees, usually monoecious, very large, with clear straight boles beneath a globular crown (young trees conical). It was a valuable resource largely consumed by the war effort. Agathis is the conifer genus par excellence of lowland tropical rain forest. 57 in Rumphius (1741). An Agathis, probably either A. dammara or A. borneensis, was early noticed and exploited by representatives of the Dutch East India Company, and was described to science in 1741 by Rumphius as Dammara alba. New Caledonia. Microsporophyll head in adaxial view round or spatulate, only 1-3 mm broad (4-5 mm in. Pollen cone basal bracts to 10x30 mm, seed cone scales with a boss on the upper margin. Ilomavis, Energy Development Corporation (EDC) Site G, Mount Apo Natural Park; coordinates of general area There are two subspecies, distinguished by distribution and by pollen cone morphology: 1. Leaves and ripening female cone ... Agathis robusta is a slow-growing but long-lived large evergreen conifer that can reach a height of 25 - 30 metres, exceptionally to 43 metres. New Caledonia. Many species of Agathis are listed by the WCMC as vulnerable or endangered and in decline. Earle, 2003.03]. In contrast, young trees are normally conical in shape, forming a more rounded or irregularly shaped crown as they achieve maturity. 2006. The female cone … (1998) and integrated molecular, morphological and fossil data by Escapa and Catalano (2013), evaluating relationships within the Araucariaceae as a whole. Seed cones usually on short lateral branchlets, maturing and deciduous in 2 years, globose-ovoid, with numerous, flattened, broadly ovate scales without bracts and with minute apical umbos. Elucidation of this puzzle required molecular analysis, including rbcL gene sequences by Setoguchi et al. 2nd rev. Microsporophyll head thick and small, 2×1.5 mm. Agathis robusta also occurred in good stands on the Kirrama Range and most of this area was logged during the second world war. Explains the importance of Sir Joseph Banks, Kew and the RBG Sydney, and the historical significance of kauris still growing in Sydney. ~ Male Kauri Cone pendant ~ 48mm tall (1.9 inches). determination in cycad is possible only after maturity and cone formation. Male cones oblong, straight, ultimately 3-4 cm long, 10 Further work is needed to resolve relationships within the latter group, which seems likely to have speciated over a fairly long period. The presence of the species triggered the construction of access roads to a number of North Queensland localities, e.g. Komarovia 4:62. 8:308-317. Microsporophyll head large, 4-5 mm across at anthesis. Female cones ellipsoid to globose, 6-8.5 x 5.5-6.5 (- 13) cm; seed scales 30-40 mm long, roughly tri-angular in shape with a well rounded apical margin. Each of the densely packed scales (3.5-4.0 cm long and 4-4.5 cm wide) usually bears a single seed at its base. Peninsular Malaysia. Juvenile leaves larger than adult leaves, more or less acute, varying among the apecies from ovate to lanceolate. The 'Square Kauri', a large tree of Agathis australis in New Zealand. Seeds ovoid, compressed, margins winged. Lambert 1822; Salisburyodendron A. V. Bobrov et Melikyan 2006. The female (seed) cones are globose, 8–13 cm diameter, and mature in 18–20 months after pollination; they disintegrate at maturity to release the seeds. Wollemi Pine (Wollemia nobilis) recovery plan. Female Reproductive Organs: True female cone or strobilus is absent Cycas. International Journal of Plant Science 154: 187-225. 1) . Pollen cone with distinctly convex sides, 14-18 mm diameter at anthesis and ultimately attaining 20 mm. Cycas circinalis, a species endemic to India was the first cycad species to be described and was the type of the generic name, Cycas category. Even in the 1920's and 1930's conflicts occurred between those who sought to exploit these stands and those who sought to protect them. Branch abscision, common in Agathis, helps the trees to minimize their epiphyte load. Microsporophyll head small, 1-3 mm across at anthesis. Agathis ovata in habitat, New Caledonia iNaturalist observation 38111819 [Joey Santore, 2020.01.30], Foliage on the tree shown above iNaturalist observation 38111819 [Joey Santore, 2020.01.30]. 2004. New Caledonia. Naturally, various species are also attacked by a wide range of fungal diseases (Whitmore 1977). Female (seed) cones are globular, 8-13 cm across, and are borne on short woody stalks. Microsporophyll head at anthesis 1.5 mm across, serrulate to crenulate.