On the presence of Mittenothamnium reduncum (Hypnaceae) in Argentina

Mittenothamnium reduncum, un nuevo registro para la flora briológica de Argentina, se describe, ilustra y comenta brevemente. Se presentan las diferencias morfológicas entre este taxón y M. reptans, la especie más frecuente en el áreaMittenothamnium reduncum is recorded for the first time for the bryological flora of Argentina. A brief description, illustration, and discussion of the species are provided. Morphological differences between this taxon and M. reptans, the most frequent species in the area, are presented.Fil: Colotti, Maria T.. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; ArgentinaFil: Suarez, Guillermo Martin. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaFil: Schäfer verwimp, Alfons. Mittlere Letten 11, 88634 Herdwangen-schãnach, German; Alemani

New features of flat (4+1)-dimensional cosmological model with a perfect fluid in Gauss-Bonnet gravity

We investigated a flat multidimensional cosmological model in Gauss-Bonnet gravity in presence of a matter in form of perfect fluid. We found analytically new stationary regimes (these results are valid for arbitrary number of spatial dimensions) and studied their stability by means of numerical recipes in 4+1-dimensional case. In the vicinity of the stationary regime we discovered numerically another non-singular regime which appears to be periodical. Finally, we demonstrated that the presence of matter in form of a perfect fluid lifts some constraints on the dynamics of the 4+1-dimensional model which have been found earlier.Comment: 14 pages, 5 figures, 1 table; v2 minor corrections, conclusions unchange

New national and regional bryophyte records, 69

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New national and regional bryophyte records, 49

Peer reviewe