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Abstract. Ribeiro KAF, Madeira de Medeiros C, Agudo JAS, Sánchez JS. 2019. Seed germination of Carex lainzii Luceño, E. Rico & T. Romero: An endemic Spanish endangered species. Biodiversitas 20: xxxx. Strategies to halt the decline of biodiversity include: in-situ and ex-situ conservation, the latter already considered at the global level essential in conservation programs. The results of the germinative responses of Carex lainzii Luceño, E. Rico & T. Romero (Cyperaceae), an endemic Spanish endangered species, are presented in this work, to different trials carried out in the laboratory with seeds harvested in the two known populations of that community. Treatments with and without 0.2% potassium nitrate (KNO3) were tested for four, six and eight months in cold stratification at 5 °C in two germination chambers at different temperatures (22/10 °C and 27/15 °C with a photoperiod of 12/12 hours). The results indicate that there is a large difference in germination rates between the two populations. The use of KNO3 did not increase germination rates in any case, but differences were found between periods of cold stratification, with six months being the most effective. On the other hand, the germination rates of both populations remain low (17.58% and 2%) compared to the obtained rate of seed viability. With this first approach to the understanding of the germination requirements of C. lainzii, it becomes clear that new essays are needed to obtain better results, in order to effectively implement the protection plans of C. lainzii populations.

RESÚMEN Y ESTRUCTURA DE LA TESISEl presente trabajo doctoral se inscribe en el ámbito de los estudios de Biología de Conservación, aplicados en concreto a varias especies vegetales consideradas de interés en el territorio geográfico de Castilla y León (catalogadas en las categorías de "En peligro de extinción (EN)" o "Vulnerable (VU)", según el Decreto 63/2007, de 14 de junio, "por el que

Astragalus devesae Talavera, A. González & G. López (Fabaceae) is a threatened Hispanic endemic species whose distribution is restricted to the center of Spain (the province of Ávila). It is classified as "Critically Endangered" in the 2010 List of Threatened Spanish Vascular Flora and as "Endangered" in the "Decree 63/2007" of Castile and Leon (administrative region in which Ávila is included). In this study, censuses of three existing populations were carried out and one of these that was found along the course of this work, was ecologically characterized. High interpopulation variability (0%, 26%, and 73%) was observed with respect to seed germination rates, obtained through germination tests using chemical scarification with sulfuric acid (H 2 SO 4 ). In addition, successful experimental population reinforcement was carried out (40%-60% survival of individuals) using plants obtained from previously germinated seeds. The results of this work contribute positively to the conservation of this species, although further studies to understand its biology and to find new populations are required.