We present results of the study on benthic marine algae in eight localities from the coast of Campeche, Mexico. The results indicate the presence of 211 taxa of marine algae with Rhodophyta having the greatest diversity with 102 taxa, followed…

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…

A new species, Hypoxis colliculata from Oaxaca and Chiapas, México is presented here. It belongs to the group with black seeds and is separated from the other species by the colliculate sculpturing of the seeds.

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…

Two orchid species, both previously known from Central America, are reported for the Mexican flora: Oncidium poikilostalix and Telipogon helleri. The former species was previsouly known under the name Sigmatostalix poikilostalix, and the latter as Stellilabium helleri. The rediscovery of…

Objective. This report describes the main clinical features associated with specific reading disability (RD) in a group of 778 school-age children studied in a Neuropsychological Clinic in Mexico City. Material and Methods. The study was performed retrospectively, using data abstracted…

We studied the interaction between the plant Cnidoscolus multilobus, its floral visitors and the predator spider Peucetia viridans. The diet of P. viridans was composed exclusively of arthropods (spiders 32%, insects 68%). Body length of prey was 5.9 ± 1.0…

Six gastropod species including two new ones, belonging to the family Architectonicidae, of the genera Architectonica, Granosolarium and Pseudomalaxis, are described for the Late Paleocene Sepultura Formation in Baja California, northwestern Mexico. The new species Architectonica bieleri and Architectonica bajaensis…

In recent years, some authors have shown that some auroras can be observed at relatively low latitude when the geomagnetic activity is quiet or moderate. This very special type of aurora is called "sporadic aurora". We present and analyze in…

OBJECTIVE: To determine the effect of altitude of residence on influenza A (H1N1). MATERIALS AND METHODS: We analyzed 207 135 officially notified of influenza-like illness (ILI) cases, 23 048 hospitalizations and 573 deaths during the first months of the novel…