Epidendrum madrense, traditionally treated under the synonymy of Prosthechea chacaoensis, is recognized as a distinct species and transferred to Prosthechea. The number, length, and shape of the nectar guides on the labellum are useful taxonomic characters to distinguish closely related…

The name Didymaea alsinoides (Schltdl. & Cham.) Standl. has been incorrectly applied to a common and wide-ranging Mexican and Central American species whose correct identity is Didymaea Mexicana Hook. f. In this paper a lectotype is selected and designated for…

An analysis of the weekend air pollution episode of April 14-15, 2007 is presented using air quality modeling techniques. It is shown that the emissions of Toluca Metropolitan Area west of México City influencing the air quality of the city…

A comparative study of the gametophytes of eight Mexican species of the genus Blechnum (Blechnaceae) is described. Fertile plants for spore collection were obtained at different Mexican localities. The spores were sown in agar enriched with Thompson media and cultured…

An automated weather station was installed in January 2004 for the first time at the Destacamento Las Grutas of Gendarmería Nacional, Province of Catamarca (26°52'35"S, 68°18'37"W, 4000 masl). From April to December, meteorological conditions on the mountain were observed in…

Based on samples obtained in 2000-2002 from a 1-cm layer of surface sediment at two sites in Bahía Concepción in the Gulf of California, cyst-theca relationships were defined from cyst germination assays for Gonyaulax spinifera (= Spiniferites mirabilis), Protoceratium globosum,…

In México, there is a network of 12 meteorological radars to monitor intense convective systems. Data from Cerro de la Catedral Doppler radar, 40 km northwest of México City, have been used to obtain precipitation rates estimates during intense precipitation…

Two cases of low-latitude snow with lightning are studied to determine their characteristics. Both cases had synoptic-scale origins, but also featured smaller-scale influences (e. g. orographic lift and elevated instability). The first event occurred in the Southern Hemisphere and was…

This work identifies some of the climate-hydrological variables that best express the vulnerability of hydrological resources at watershed level (Sinú-Caribbean Basin, Colombia). The analysis utilizes the outputs of some general circulation models runs under different scenarios of greenhouse gas emissions…

This paper analyzes some summer rainfall characteristics in Buenos Aires and developes a seasonal prediction scheme. Buenos Aires is located along the coast of the Río de la Plata in Argentina. The outstanding rainfall feature is the presence of an…