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Palacios-Rios, M. 1992. Dicksoniaceae. In: V. Sosa (ed.). Flora de Veracruz 69:1-11.
Botanical Sciences, 2017
Con base en estudios de material de herbario y en observaciones en el campo, se reconocen cinco especies de Ficus subgénero Pharmacosycea en Veracruz: Ficus insipida Willd., F. lapathifolia (Liebm.) Miq., F. maxima Mill., F. petenensis Lundell y F. yoponensis Desv. Se incluye clave de determinación, descripciones, sinonimia parcial, mapas de distribución e ilustraciones para cada especie.
Acta Botanica Mexicana, 2020
Resumen: Antecedentes y Objetivos: La familia Bromeliaceae en México está integrada por 422 especies, de las cuales en Veracruz se encuentran 96(22.7%); diez de ellas son endémicas al estado. El objetivo de este estudio fue identificar y reportar las especies de bromeliáceas que no se habían registrado previamente para la entidad. Métodos: Se realizaron exploraciones botánicas en diferentes regiones del estado de Veracruz como parte de la investigación de dos tesis doctorales. Adicionalmente se revisaron las colecciones de Bromeliaceae en los herbarios CORU y XAL. Resultados clave: Se documentan nuevos registros para el estado de Veracruz de dos especies del género Tillandsia (T. bourgaei y T. roseoscapa) y de una especie del género Pitcairnia (P. xanthocalyx). Una especie más (Tillandsia prodigiosa) representa un redescubrimiento para la flora estatal. Finalmente, se presenta información sobre la distribución y el hábitat, así como fotografías de cada una las especies. Conclusiones: Los resultados obtenidos, en conjunto con otros nuevos registros reportados previamente, confirman que la zona centro del estado de Veracruz, especialmente la zona Córdoba - Orizaba - Zongolica había permanecido, hasta hace poco, pobremente estudiada desde el punto de vista florístico. Resalta la importancia de la vegetación xerófila presente en el área, en la cual habitan especies que se comparten con la flora del Valle de Tehuacán-Cuicatlán. Lo mismo aplica para la porción norte del estado, en la región del Totonacapan, la cual también ha recibido escasa atención de los botánicos mexicanos. Palabras clave: Pitcairnia, primer registro, redescubrimiento, Tillandsia.
In order to analyze the growth of tree ferns in the Cordillera Central, between March 2006 and February 2007, the population of Dicksonia sellowiana in the Rio Blanco Reserve (Manizales, Caldas) was monitored. The DAP, total height, leaf number and reproductive status were recorded quarterly. This information was related to precipitation and compared with specimens deposited in the COL, HUA and FAUC herbaria. The diameter increased by 1.2 cm, especially in the first 2007 season. The height growth of the stem was 6.7 cm, with the same trend. The leaf number was stable with 9 initial leaves. Only plants with a height greater than 4 m were fertile. The results showed that D. sellowiana answers to a bimodal seasonal phenological pattern determined by rainfall, coinciding with the increased sporulation recorded in herbarium specimens. Similarly, the growth in the stem was similar to other Cyatheales species, mainly Alsophila. The emission and accumulation of leaves were seen in continuous “double leaf” modules, an adaptive strategy in the high Andean ecosystems, where the accumulated organic matter of slow decomposition stabilizes the microclimate. These arguments provide a basis for the development of conservation programs from the study and sustainable management of natural populations.
Botanical Sciences, 2017
Stem and root anatomy of two Wilcoxia species distributed in the northeast of Mexico are studied to contribute to cacti knowledgement, to conclude about their rayless wood and to compare their anatomy with that of other Cactoideae members. Results show that Wilcoxia species have unistratified hypodermis, palisade chlorenchyma, lack of fibers in phloem, and rayless wood. Raylessness probably was an important factor in the evolution ofvascular cámbium in these species. Species differ in sorne quantitative characters and porosity type. In Wilcoxia's tuberous root, vascular tissue is scarse and restricted to radial rows, while storage tissue occurs in cortex and parenchyma associated to secondary xylem. Additional tuberous root developmental studies should contribute to understand anatomical diversity reported for Cactaceae.
Acta Botanica …, 2006
Journal of Values Based Leadership , 2024
This study broadly addresses some of the criticisms associated with authentic leadership theory related to measurement and antecedents. Measurement: One purpose of this study was to verify the dimensionality of authentic leadership by testing the construct validity of three measures for authentic leadership: the Authentic Leadership Questionnaire (ALQ), the Authentic Leadership Inventory (ALI), and the Authentic Leadership Integrated Questionnaire (AL-IQ), proposed by Levesque-Cote et al. (2018) as an improvement on the previous two scales. This study was designed to replicate and extend Levesque-Cote et al. (2018) study with an English-speaking sample to further test the structural validity of the AL-IQ. This study was not designed to test the nomological network, associated outcomes for Authentic Leadership, or convergent and divergent validity. As such, we first employed confirmatory factor analysis (CFA), experimental structural equation modeling (ESEM), and bifactor analytic modeling (BAM) to validate the structure of the two original scales and the combined AL-IQ. In line with the Levesque-Cote et al. (2018) study, a four-factor ESEM model best fit the data for the AL-IQ, suggesting that the scale will work similarly in English-speaking samples. Antecedents: A second purpose of this study was to examine correlations between the three measures of authentic leadership and the perceived emotional intelligence of leaders. This study failed to establish discriminant validity between authentic leadership and emotional intelligence, as there were very strong correlations between all four scales, suggesting that emotional intelligence is an essential part of authentic leadership.
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