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Susceptibility of epiphytic bromeliads to climate change. Manuel J. Recibido: 30 de abril de Aceptado: 27 de julio de Epiphytic bromeliads are one of the most threatened groups of plants by global climate change due to its high sensitivity to environmental variation. In this review we discuss the adaptations that epiphytic bromeliads have to face adverse environmental conditions.

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Vegetative anatomy of two Nymphoides species Menyanthaceae. Recibido: 10 enero Aceptado: 17 marzo Two species of Nymphoides grow in Mexico, N. Since only a few species in the genus have been anatomically studied, we worked on the vegetative anatomy of both species and N.

We describe the anatomy of both, as seen in slides obtained through microtome, by free hand and transparentations. We found the root surface covered by several exodermis layers with a mucilaginous secretion; the primary cortex is constituted by rounded cells and lacks intercellular spaces in N.

The stem has abundant aerenchyma and astrosclereids. Leaves have anomocytic stomata on the adaxial side, and abundant hydropoten on the abaxial; venation is actinodrome flavelated with the terminal portions modified to water pores; branched sclerenchyma present as idioblasts are common. In transverse section, the lamina has a simple epidermis, a mesophyll differentiated in a palisade parenchyma three to five layers thick, and a spongy mesophyll with large abundant air cavities in the abaxial side, astrosclereids are abundant.

The mucilaginous exodermis had not previously been described, and the oxalate crystals described by other authors were not found. Key words: anatomy, roots, stems, leaves. La estructura que emerge del rizoma en N. Finalmente, N. Para N. Kuntze y N. Las plantas se colectaron en los estados de Tamaulipas N.

Se hicieron cortes en plantas maduras con flores de dos individuos, provenientes de dos localidades para ambas especies. Las descripciones siguen los criterios y nomenclatura de Radford et al. Las descripciones corresponden a ambas especies a menos que se indique lo contrario, ya que son pocas las diferencias entre las estructuras estudiadas. La endodermis es uniestratosa bien definida y conspicua, no se distingue un periciclo Fig. En un corte transversal de tallo, la epidermis es uniseriada.

Las astrosclereidas son abundantes Fig. Los engrosamientos del xilema son de tipo anular y helicoidal Fig. Estas observaciones concuerdan con las de Gattuso y Gattuso y las de Raynal Los cuerpos verrucosos de Raynal seguramente corresponden a lo que describimos como hidropoten.

A la Dra. Teresa Terrazas por revisar el manuscrito. Conard, H. The banana floatingheart Nymphoides aquaticum. Omega, Barcelona. Labor, Barcelona. Fucsin staining with NaOH clearing for lignified elements of whole plants or plant organs. Kuntze Menyanthaceae. Plant microtechnique. Novelo, M. Olvera y P.

Anatomy of the dicotyledons. Claredon, Oxford. Dickinson, J. Massey, C. Vascular plant systematics. Harper et Row, London. Le genere Nymphoides Menyanthaceae en Afrique et a Madagascar. Adansonia, ser. The biology of aquatic vascular plants. Martin's, New York, p. Servicios Personalizados Revista. Similares en SciELO. Resultados Las descripciones corresponden a ambas especies a menos que se indique lo contrario, ya que son pocas las diferencias entre las estructuras estudiadas.

Literatura citada Conard, H. Circuito exterior, Ciudad Universitaria, Del.

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Vegetative anatomy of two Nymphoides species Menyanthaceae. Recibido: 10 enero Aceptado: 17 marzo Two species of Nymphoides grow in Mexico, N. Since only a few species in the genus have been anatomically studied, we worked on the vegetative anatomy of both species and N. We describe the anatomy of both, as seen in slides obtained through microtome, by free hand and transparentations. We found the root surface covered by several exodermis layers with a mucilaginous secretion; the primary cortex is constituted by rounded cells and lacks intercellular spaces in N.

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Sistema OJS3 - Metabiblioteca. Inicio Archivos Vol. Publicado Sep 17, Reyes, A. Referencias Allen, G. Chu, C.

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