Morfología de esporas y sinangios en especies neotropicales del helecho Marattia (Marattiaceae)

The Marattiaceae are represented by a small family of four to six genera that bear esporogenous structures of two types: sorus with free eusporangia in Angiopteris and Archangiopteris, and indurated synangium in Christensenia, Danaea and Marattia. Marattia is a pantropical genus of about eight to te...

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Detalles Bibliográficos
Autores principales: Lavalle, María del Carmen, Mengascini, Adriana Susana, Rodríguez, Mónica
Formato: Articulo
Lenguaje:Español
Publicado: 2011
Materias:
Ciencias Naturales
Biología
Marattia
Neotropic
Ornamentation
Receptacles
Sinangia
Spores
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/105191
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-105191
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Naturales
Biología
Marattia
Neotropic
Ornamentation
Receptacles
Sinangia
Spores
spellingShingle Ciencias Naturales
Biología
Marattia
Neotropic
Ornamentation
Receptacles
Sinangia
Spores
Lavalle, María del Carmen
Mengascini, Adriana Susana
Rodríguez, Mónica
Morfología de esporas y sinangios en especies neotropicales del helecho Marattia (Marattiaceae)
topic_facet Ciencias Naturales
Biología
Marattia
Neotropic
Ornamentation
Receptacles
Sinangia
Spores
description The Marattiaceae are represented by a small family of four to six genera that bear esporogenous structures of two types: sorus with free eusporangia in Angiopteris and Archangiopteris, and indurated synangium in Christensenia, Danaea and Marattia. Marattia is a pantropical genus of about eight to ten species in the paleotropic and seven to eight species in the neotropic. In order to describe the spores and sinangia morphology, this study analyzed the shape of the receptacles, and the position of the synangia, and evaluated the spores with SEM, of seven neotropical species of the genus Marattia: M. alata, M. cicutifolia, M. excavata, M. interposita, M. laevis, M. laxa y M. weinmanniifolia from several collections. The receptacles were fully developed in M. cicutifolia and M. laevis, and scarcely overelevated in the rest of the species. The synangium was ellipsoidal and had intramarginal to supramedial position in the laminae. The spores of Marattia were elliptic. Among the taxa, only monolete spores were found, with no trilete, aborted or deformed spores. The laesura was linear and reached about two of the total length of the spore. The perispore appears as a continuous thin layer deposited on the exospore according to its ornamentation in M. cicutifolia and M. laevis. It is smooth in M. alata, rugate in M. excavata and pustulate-rugate in two species: M. interposita and M. laxa. The exospore is echinate in M. cicutifolia and M. laevis and pustulate in the other species. In M. weinmannifolia spores produced by the same sinangium may have different ornamentation types. We concluded that, while the presence of ellipsoidal and superficial synangia and monolete spores aperture were generic traits, the micro and macro-ornamentation types of the perispores and exospores vary at specific level. Besides, macro-ornamentation can be bulliform (pustulate), a combination of bulliform and muriform types (pustulate-rugate), muriform (rugate-retate) and stelliform (echinate); finally, granular micro-ornamentation can be seen frecuently in perispores.
format Articulo
Articulo
author Lavalle, María del Carmen
Mengascini, Adriana Susana
Rodríguez, Mónica
author_facet Lavalle, María del Carmen
Mengascini, Adriana Susana
Rodríguez, Mónica
author_sort Lavalle, María del Carmen
title Morfología de esporas y sinangios en especies neotropicales del helecho Marattia (Marattiaceae)
title_short Morfología de esporas y sinangios en especies neotropicales del helecho Marattia (Marattiaceae)
title_full Morfología de esporas y sinangios en especies neotropicales del helecho Marattia (Marattiaceae)
title_fullStr Morfología de esporas y sinangios en especies neotropicales del helecho Marattia (Marattiaceae)
title_full_unstemmed Morfología de esporas y sinangios en especies neotropicales del helecho Marattia (Marattiaceae)
title_sort morfología de esporas y sinangios en especies neotropicales del helecho marattia (marattiaceae)
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/105191
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