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| LUSK,CHRISTOPHER H.; LE-QUESNE,CARLOS. |
| The growth of Araucaria araucana, like that of many other conifers, is characterised by the production of a monopodial stem with branch whorls. However, the periodicity of whorl formation in this species has not been subjected to systematic study. We used growth ring counts to determine the frequency of whorl formation in sun- and shade-grown juvenile A. araucana in a montane forest in the Chilean coast range. Whorls were not annual in any of the 35 individuals studied, growth rings outnumbering whorls by a factor of 1.8 to 3.9. The mean interval between successive whorls was significantly shorter in sun-grown (2.1 yrs whorl -1) than in shade-grown trees (2.6 yrs whorl-1), suggesting a relationship with plant carbon balance. Mean distance between whorls... |
| Tipo: Journal article |
Palavras-chave: Araucariaceae; Conifers; Dendroecology; Tree growth; Tree rings. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300013 |
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| FUEYO,GEORGINA M. DEL; GNAEDINGER,SILVIA C.; DIAZ,MAITEN A. LAFUENTE; CARRIZO,MARTÍN A.. |
| Abstract Abstract: Anatomically preserved conifer-like leaves from the Middle Jurassic La Matilde Formation at the Barda Blanca locality in the Gran Bajo de San Julián area, southern Patagonia are described here. Leaves are assigned to conifers based on the following foliar features: thick-walled epidermal cells, a sclerenchymatic hypodermis, resin canals and transfusion tracheids associated with the vascular bundle. General mesophyll anatomy and inferred foliar morphology suggest a similarity to large, broad, linear-lanceolate, multi-veined conifer-like leaves. The general foliar habit indicates an affinity with the large, multi-veined leaves of the Araucariaceae; especially with those exhibited by the species of the Araucaria sections, Araucaria and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conifers; Jurassic; La Matilde Formation; Leaves; Patagonia; Permineralized. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400510 |
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| Hulvey, J.; Telle, S.; Nigrelli, L.; Lamour, K.; Thines, M.. |
| Leptographium spp. are anamorphs of Grosmannia residing in the order Ophiostomatales. These fungi are typically associated with bark-beetles and are common causal agents of sapstain in lumber and some are important tree pathogens. In this study, Leptographium spp. associated with bark beetles collected during a survey in Jilin and Yunnan provinces of China, were identified. Identifications were achieved using comparisons of morphological characters and DNA sequence data for the ITS2-partial LSU rDNA region, as well as the β-tubulin and EF-1α gene regions. Eight unknown species of Leptographium are recognised and described from conifer and hardwood hosts, associated with beetles including Ips subelongatus, Tomicus yunnanensis, Hylurgops minor, Polygraphus... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Bark beetles; China; Conifers; Grosmannia; Hardwoods; Ophiostomatales. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/532019 |
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