Nuevos datos para la flora leonesa

Se mencionan una serie de táxones cuya localización leonesa presenta interés desde el punto de vista corológico y ecológico.

Datos florísticos sobre la comarca del Embalse de Santillana (Madrid, España), II

Como en la nota anterior (Lazaroa 3: 367-369. 1982) se comentan brevemente una serie de taxones herborizados en la comarca madrileña del Embalse de Santillana, Se propone una nuevac ombinación en el género Sideritis L., Sideriris incana L. subsp. incana var. spinulosa (Font Quer) Rivas Goday & Borja comb. nova.

Sumario

Sin resumen

Datos biográficos y bibliográficos del Profesor José Cuatrecasas Arumi

Datos biográficos y bibliográficos del Profesor José Cuatrecasas Arumi.

Problems of dynamic in mediterranean forests

The mediterranean forest ecosystems constitute a complex unit which is marked off the Northern and middle European ones by its climate, ecology and management.The ecosystems are related to a climate with estival droughtlasting from 1 to 6 months and the peculiar species which constitute them are generally not worth much.The anthropic pressure exerts especially by grazing and moreover they have been stricken by dramatic fires for many decades. Their large variety related to the bioclimatic and edaphic heterogeneity of the region can explain why the data concerning their functioning and dynamics are still fragmentary. Besides, their ecological and pedological characteristics make uneasy the use of schemes and patterns designed for middle european forests.