En Suramerica, se tiene registro de la familia para el Cretacico Superior de Argentina con Regnellidium thomas-taylorii Cuneo, Gandolfo et Hermen (Cuneo et al.
Regnellidium (Salviniales, Marsileaceae) Macrofossils and Associated Spores from the Late Cretaceous of South America.
A Marsileaceaphyllum Cuneada- 4 Crenado-Crenulado mahisensis Flabelada Regnellidium Cuneada- 2 Entero thomas-taylorii Flabelada Regnellites Flabelada 2 Entero nagashimae Regnellites cf.
Mature sporocarps were collected from plants in a natural population of Regnellidium diphyllum in the municipality of Gravatai (29[degrees]57'18"S, 51[degrees]1'52"W), in the state of Rio Grande do Sul, Brazil.
1], which are appropriate abiotic conditions for in vitro culture of Regnellidium diphyllum (Wunder et al.
Regnellidium diphyllum megaspore germination occurred under all concentrations of lead nitrate (Pb[(N[O.
The heterosporous fern Regnellidium diphyllum Lindman occurs in southern Brazil and some adjoining localities in Uruguay and Argentina (Schultz, 1949; Alonso-Paz and Bassagoda, 2002) and figures on the endangered species list of the state of Rio Grande do Sul, Brazil (Rio Grande do Sul, 2011).
The aim of this study was to investigate germination of megaspores and initial development of sporophytes of Regnellidium diphyllum in the presence of nickel, providing information on the influence of this metal in the establishment and growth of the species.
Ferns studied include Marsilea (Kuligowski-Andres, 1977; Vallade & Bugnon, 1979; Kurth, 1981; Lin & Raghavan, 1991), Regnellidium (Eastman & Peterson, 1985), Azolla (Gunning et al.
Root apex structure in Regnellidium diphyllum (Marsileaceae).
Regnellidium diphyllum Lindman, a heterosporous fern in the Marsileaceae family, has its distribution restricted to Southern Brazil and some adjoining localities in Uruguay and Argentina (Schultz, 1949; Alonso-Paz and Bassagoda, 2002).
Mature sporocarps of Regnellidium diphyllum were obtained from different plants collected in the municipality of Triunfo (State of Rio Grande do Sul, Brazil) and kept at room temperature (about 25 [degrees]C) until the beginning of the experiment, one month later.