Search

El artículo presenta noticias que tratan de la economía latinoamericana. Se informa sobre una comisión colombo-ecuatoriana que estudia las posibilidades de integración de las zonas fronterizas de ambos países. Se anuncia que Chile es uno de los grandes exportadores de papel. Se habla de un remanente de 300.000 toneladas de trigo que tiene Uruguay para exportación.

This paper deals with a taxonomic study of Cyanophyta epiphytic on submerged plants in the following ponds: Chascomús, El Burro, Yalea and Vitel. Keys are given for the identification of the 3 orders, 5 families, 11 enera and 24 species found. The taxa are described and the species illustrated. Eigth species are described for the first time for Argentina. [ABSTRACT FROM AUTHOR]

In this third paper dealing with the algae of Brazil, four Chlorophycophyta and six Chrysophycophyta are described. These organism were found in the so called "Sete Lagoas" Lake-District, State of Minas Gerais. They are: Granulochloris maxima nov. sp., Pseudoquadrigula lagoensis nov. gen., nov. sp., Oedogonium spirostriatum, Pseudochaete crassisetum (Chlorophvceae), Phalansterium digitatum (Chrysophyceae), Tetraedriella polychloris, T. acuta, Goniochloris gigas, Peroniella minuta y Pseudostaurastrum enorme (Xanthophyceae). Except Oedogonium, all these genera are mentioned for the first time for Brazil and also for South America. [ABSTRACT FROM AUTHOR]

In the first part of this paper, the author gives basic information on the physiography, climate and vegetation of the studied area, which is located in the northwestern corner of Argentina and covers the provinces of Jujuy, Salta, Catamarca, Tucumán and partially, Santiago del Estero and La Rioja. Also, in that general part, comments are made on the level of the local knowledge of the Pteridophytes. In the subsequent chapters, the author offers a key of families and the revision of Lycopodiaceas, Selagnellaceae, Equisetaceae, Psilotaceae, Ophioglossaceae, Schizaeaceae, Hymenophyllaceae, Cyatheaceae, Dennstaedtiaceae and Adianlaceae (according to Alston's classfication of the leptosporangiate ferns), with a total of 25 genera and 77 species. Under each taxon, the synonymy, types, relationships, cited specimens, distribution patterns and ecological information are given. Three new species are described: Hymenophyllum (Sphaerocionium) capurroi, Cheilanthes volcanensis and Pleris famatinensis and the following combinations are proposed: Adiantum thalictroides var. hirsutum (Hook & Grev.) and Pleris inermis (Rosenst.). Maps, graphs and illustrations of the new taxa are also given. [ABSTRACT FROM AUTHOR]

In the present paper, the fourth of the series which started with a study of the sporophyte of Salvinia oblongifolia, the author reports some data on the following aspects of S. rotundifolia: anatomy of the rhizome and submerged organ. Comparative data on its related species, S. herzogii, are given. [ABSTRACT FROM AUTHOR]

In the present paper, the author describes a new species of Salvinia, S. herzogii, on Argentine material from Lower Paraná River. It is probable that all specimens of this country determined S. auriculata Aublet, belong to this new species. A key for identification of S. herzogii and related species according to the leaf characters and configuration of the submerged organs is given. [ABSTRACT FROM AUTHOR]

This is the first from a series of papers dealing with the comparative study of all neotropical species of Salvinia. In the first part, the author comments the systematic position of all the species mentioned so far for tropical America. In the second part, the morphology and structure of the sporophyte and its reproductive organs of Salvinia oblongifolia are studied. This species lives in the center-north and NE of Brazil. [ABSTRACT FROM AUTHOR]

Thirty species of Inoperculate Discomycetes are described herein from the Nahuel Huapí National Park (Argentina), distributed among thirteen genera belonging to the following families: Hyaloscyphaceae, Dermataceae, Sclerotiniaceae y Helotiaceae. Three of them, namely, Calloria, Sphagnicola and Phaeohelotium are recorded for the first time for Argentina. Of the thirty species found, fifteen are new records for this country. The following new combinations are proposed: Cyathicula chlorosplenioides (Speg.) Gamundí (basinym: Helotium chlorosplenioides Speg.); Rutstroemia megalospora (Speg.) Gam. (bas.: Helotium megalosporum Speg.) y Rutstroemia microsperma (Speg.) Gamundí (bas.: Helotium microspermum Speg.). The paper contains a critical study of type material from Spegazzini's herbarium, and the description of a new species of the same general area: Phaeohelotium castaneum. [ABSTRACT FROM AUTHOR]

In the present paper, the second of the series with started with a study of the sporophyte of S. oblongifolia, the author repords some dates and adds comments of the following aspects of S. auriculata: leaf dimorphism, venation, experiments of decapitation of the submerged organs and the lateral branches; leaf anatomy with the special emphasis on the development air chambers and hair and papilla formation; ramificación of the submerged organs and its significance for the identification of S. auriculata and related species [ABSTRACT FROM AUTHOR]

Several approximations to the binomial distribution were compared in 1956 by Raft [9], including the normal, arcsine, normal Gram-Charlier, Camp-Paulson, Poisson, and Poisson Gram-Charlier approximations. The closeness of these approximations is judged by the maximal error which can arise in evaluating any sum of consecutive binomial terms. Borges [3] investigated a general class of approximations (which includes some of the above) and showed that a certain beta-transformation of a binomially distributed variable is the unique member of this class which is approximately normal with error 0(l/n). In 1963, Bol'shev [2] gave two new Poisson-type approximations. In this paper, some of Raft's tables are extended and tables for the error of these newer approximations are added. As a consequence of the numerical results obtained, the Poisson Gram-Charlier approximation is recommended for small values of p while the Camp-Paulson and Borges' approximations should generally be preferred for large p. [ABSTRACT FROM AUTHOR]

Data editing by a computer program can be regarded as a form of statistical quality control. In that perspective, costs and benefits of alternative programs can be compared to one another and, of course, to no control plan at all. This paper outlines one approach to cost-benefit comparison and utilizes a realistic example to suggest that computerized data editing is generally superior to clerical editing. It also warns against edit programs which provide for record rejections and off-line review. Most importantly, it urges that a systematic comparison of costs can assist significantly in edit planning. [ABSTRACT FROM AUTHOR]

In this short paper, the author reports the presence of Notholaena sulphurea (Cav.) J. Sm. in NW and W Argentina (Jujuy and La Rioja Provinces). A key for the Argentine species of that genus, is also given. [ABSTRACT FROM AUTHOR]

Se presentan noticias que tratan de la economía internacional. El Fondo Especial de la Organización de las Naciones Unidas tropezaba con una aguda escasez de recursos financieros. La economía de Europa Occidental entraba en una fase de auge. Se habla del consumo mundial de papel y sus derivados.

El artículo presenta detalles sobre actividades patrocinadas por el Centro de Estudios Monetarios Latinoamericanos (CEMLA). Representantes decidieron encargar un catálogo de maquinaria para los bancos centrales durante la Tercera Reunión Operativa del CEMLA. Un comité designado por CEMLA laboró sobre la clasificación de las máquinas y equipos utilizados por los bancos. El artículo ofrece detalles sobre las decisiones del comité.