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| Gradstein, S.R.; Cleef, A.M.; Fulford, M.H.. |
| This paper is the second (Florschütz & Florschütz-de Waard 1974) in the series of reports on cryptogams of Colombia, especially the high Andean bryophytes and lichens, in the framework of recent phytosociological and ecological studies in the area by A. M. Cleef and T. van der Hammen (Amsterdam) and his collaborators. The aim of these studies is to prepare comprehensive descriptions of the various Andean biota of Colombia as a basis for an evaluation of the biological diversity of the Andean environment of Colombia. This paper deals with the Hepaticae or liverworts and focuses on the structure of the oil bodies in the liverwort cell and the geographical and ecological distribution of the species. There are few papers on tropical Andean liverworts. The... |
| Tipo: Article / Letter to the editor |
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| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/535100 |
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| Gradstein, S.R.; Cleef, A.M.; Fulford, M.H.. |
| Oil bodies in leaves variable in number, (2-)3-8(-13) per cell; subglobose to, more rarely, ellipsoid, 4-8(-12)x4—6 μm; colourless, rather coarsely to finely granulosepapillose, becoming homogeneous upon degeneration (Colombia, Cundinamarca, Cleef 78b, 3410b, 397b; ibid., Cauca, Cleef 679). Variation in number and morphology of the oil bodies apparently is characteristic for Lophocoleaceae, since it has been found not only in this and the other species of Lophocolea reported here but also in European material of Lophocolea and Chiloscyphus (unpubl. obs.). |
| Tipo: Article / Letter to the editor |
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| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/534852 |
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| Cleef, A.M.. |
| A phytosociological survey based on methods of the Zürich-Montpellier School was carried out in the páramo vegetation of the Cordillera Oriental, Colombia. The study area covers about 10,000 and comprises the páramo between the Nevado de Sumapaz (3°55'N, 4250 m), the Sierra Nevada del Cocuy (6°25'N, 5493 m) and the Páramo del Almorzadero (7°N, 4375 m). The páramo vegetation was studied along various altitudinal transects from the upper forest line (3000-3500 m) up to the lower limit of the snowcap (4800 m). A general description of the study area includes data on geology, geomorphology, soils, climate, flora, phytogeography, morphological characters of the vegetation, fauna and landuse. The evolution and Quaternary history of páramo vegetation and climate... |
| Tipo: Article / Letter to the editor |
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| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/534752 |
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| Gradstein, S.R.; Cleef, A.M.; Fulford, M.H.. |
| Oil bodies 7-12 in upper leaf cells, 10-20 in elongated basal leaf cells; globose to ellipsoid, 3-7(-10)x3-5 μm; colourless, coarsely segmented, consisting of c. 15-30 aggregated droplets (Colombia, Boyacá, páramos NW of Belén, Cabeceras Q. El Toral, 3765 m, Cleef 2292e; Ecuador, páramos de El Angel, 17 km. S. of Tulcán, 3350 m, Gradstein, Lanier & Weber s.n.). The presence of segmented oil bodies in Colura patagonica is remarkable because previous studies of living Colura (from Japan) reported homogeneous oil bodies (cf. Schuster & Hattori 1964; Inoue 1974). |
| Tipo: Article / Letter to the editor |
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| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/535047 |
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