Notes taxonomiques i nomenclatures sobre el genere Verbascum L. (Celsia L.) a la Peninsula Iberica i Illes Balears

En el presente trabajo se proponen cuatro cambios nomenclatures: Verbascum erosun Cav. (= V. laciniatum (Poiret) O. Kuntze); V. masguindali (Pau) comb, nov.; V. pseudocreticurn nom. nov. y V. fontqueri nom. nov. Se adjuntan dos nuevas ilustraciones, una clave dicotómica de las ocho especies ibéricas y baleáricas con cuatro estambres (Celsia L.) y una relación de los ejemplares de herbario estudiados. Verbascum masguindali se indica por primera vez en la Península Ibérica.

Datos para la Flora de Jaen

Se relacionan, a continuación, siete táxones seleccionados entre las recolecciones realizadas en junio de 1983 en el complejo orogràfico de la Sierra de Segura-Cazorla (Jaén), por C. Benedí, C. Blanché, J. Molerò y J. Vallès. Los testimonios se encuentran depositados en el herbario BCF.

L'aportació del botànic Oriol de Bolòs a la fixació del lèxic cintífic

The contribution of the botanist Oriol de Bolòs to the fixation of the scientific vocabulary. We analyse the works of Oriol Bolòs concerning the scientific terminology, particularly that of botany. We remark synthetically the theoretical aspects and we comment some case examples. Key words: Oriol de Bolòs, Scientific terminology, Botany.

Revisió taxonòmica del gènere Chamaemelum Miller (Asteraceae) a la Península Ibèrica i les Illes Balears

Se realiza una revisión taxonómica del género Chamaemelum Miller (Asteraceae) en la Península Ibérica e Islas Baleares. Se proponen dos cambios nomenclaturales: Chamaemelum nobile(L.) All. forma discoideum (Willk.) comb. i stat. nov. y C. fuscatum (Brot.) Vasc. forma minor (Hoffmanns. i Link) comb. i stat. nov. Para cada taxon se da el nombre correcto, así como las correspondientes sinonimias. Se adjunta una clave dicotómica de los táxones reconocidos y una relación de los testimonios de herbario estudiados.

Notas corologicas balearicas de Chamaesyce S.F. Gray

Con el fin de allegar materiales para un estudio cariológico de Chamaesyce S. F. Gray que forma parte de una revisión genérica, objeto de la tesis de licenciatura de uno de nosotros J. J. Orell , se planteó la necesidad de visitar la isla de Mallorca. Fruto de la visita son las notas que siguen.

Taxonomía de Chaenorhinum rubrifolium aggr. (Scrophulariaceae) en el área mediterránea occidental

Se realiza un estudio taxonómico de 9 táxones (seis específicos) pertenecientes al agregado de Chaenorhinum rubrifolium (Antirrhineae-Scrophulariaceae) en el mediterráneo occidental, aportando una clave con nuevos caracteres diagnósticos. Para cada taxon se dan el nombre correcto, sinónimos, descripción, corología y ecología, así como comentarios nomenclaturales y relativos a la tipificación. Se proponen dos nuevas combinaciones, Chaenorhinum reyesii (Vicioso y Pau in Pau) Benedí y C. grandiflorum subsp. cartilagineuse (Pau) Benedí, y se describe una nueva especie del Norte de África: C. suttonii Benedí y P. Montserrat. Se reivindican la categoría específica de C. fórmenteme Gand. y la combinación C. rupestre (Guss.) Maire.

Stochastic delay equations with non-negativity constraints driven by fractional Brownian motion

In this note we prove an existence and uniqueness result for the solution of multidimensional stochastic delay differential equations with normal reflection. The equations are driven by a fractional Brownian motion with Hurst parameter H > 1/2. The stochastic integral with respect to the fractional Brownian motion is a pathwise Riemann¿Stieltjes integral.

Large deviations for stochastic Volterra equations

This paper is devoted to prove a large-deviation principle for solutions to multidimensional stochastic Volterra equations.

Stochastic delay differential equations driven by fractional Brownian motion with Hurst parameter H 1/2

We consider the Cauchy problem for a stochastic delay differential equation driven by a fractional Brownian motion with Hurst parameter H>¿. We prove an existence and uniqueness result for this problem, when the coefficients are sufficiently regular. Furthermore, if the diffusion coefficient is bounded away from zero and the coefficients are smooth functions with bounded derivatives of all orders, we prove that the law of the solution admits a smooth density with respect to Lebesgue measure on R.

On Ito's formula for elliptic diffusion processes

Bardina and Jolis [Stochastic process. Appl. 69 (1997) 83-109] prove an extension of Ito's formula for F(Xt, t), where F(x, t) has a locally square-integrable derivative in x that satisfies a mild continuity condition in t and X is a one-dimensional diffusion process such that the law of Xt has a density satisfying certain properties. This formula was expressed using quadratic covariation. Following the ideas of Eisenbaum [Potential Anal. 13 (2000) 303-328] concerning Brownian motion, we show that one can re-express this formula using integration over space and time with respect to local times in place of quadratic covariation. We also show that when the function F has a locally integrable derivative in t, we can avoid the mild continuity condition in t for the derivative of F in x.

Marine and transitional Middle/Upper Eocenen units of the Southeastern Pyrenean Foreland Basin (NE Spain)

The stratigraphic basis of this work has allowed the use of larger foraminifers in the biostratigraphic characterisation of the new Shallow Benthic Zones (SBZ). This part of the volume presents a description of the sedimentary cycles formed by the transgressive-regressive systems of the Lutetian and Bartonian in the southeastern sector of the Ebro Foreland Basin. Concerning the Lutetian deposits studied in the Amer-Vic and Empordà areas, four sedimentary cycles have been characterised. The first and second are found within the Tavertet/Girona Limestone Formation (Reguant, 1967; Pallí, 1972), while the third and fourth cycles cover the Coll de Malla Marl Formation (Clavell et al., 1970), the Bracons Formation (Gich, 1969, 1972), the Banyoles Marl Formation (Almela and Ríos, 1943), and the Bellmunt Formation (Gich, 1969, 1972). In the Bartonian deposits studied in the Igualada area, two transgressive-regressive sedimentary cycles have been characterised in the Collbàs Formation (Ferrer, 1971), the Igualada Formation (Ferrer, 1971), and the Tossa Formation (Ferrer, 1971). The Shallow Benthic Zones (SBZs) recognised within the Lutetian are the following: SBZ 13, from the Early Lutetian, in the transgressive system of the first cycle; SBZ 14, from the Middle Lutetian, in the second cycle and the lower part of the transgressive system of the third cycle; SBZ 15, from the Middle Lutetian, in the remaining parts of the third system; SBZ 16, from the Late Lutetian, throughout the fourth cycle. The association of larger foraminifers in the first and second cycles of the Bartonian in the Igualada area has been used as the basis for the definition of SBZs 17 and 18 recognised in the Bartonian of the western Tethys.

An inventory of the marine and transitional Middle/Upper Eocene deposits of the Southeastern Pyrenean Foreland Basin (NE Spain)

In the southeastern Ebro Foreland Basin, the marine deposits of Lutetian and Bartonian age show excellent outcrop conditions, with a great lateral and horizontal continuity of lithostratigraphic units. In addition, the rich fossil record -mainly larger foraminifers-, provides biostratigraphic data of regional relevance for the whole Paleogene Pyrenean Basin, that can be used for the Middle Eocene biocorrelation of the western Tethys. This contribution is a sedimentary and biostratigraphic synthesis of the basic outcrops and sections of the Lutetian andBartonian marine and transitional deposits in the southeastern sector of the Ebro Foreland Basin.

Elements traça en esfalerites i galenes del dipòsit de Cierco (Pb-Zn). Alta Ribagorça, Pirineu Central

El diposit consisteix en dos filons E-W, tallats per un altre N-S. El rebliment filonia ès zonat amb esfalerita- galena-calcita als nivells profunds i galena-baritina als superiors. Els elements traça en esfalerites i galenes, plenament separades, han estat analitzats mitjancant fluorescència de raigs X. Els resultats mostren que l'esfalerita concentra la majoria d'elements traça, preferentment Fe, Co, Cd, Sn, Sb, Ga, Cu, Ge i Ag, amb una bona correlació entre els sis primers. La galena concentra únicament Sb, Ag i As, amb bona correlació entre els dos primers. Els continguts en elements traça estan homogèniament distribuits en tot el diposit.