Aportacion a la flora bentonica de las islas Baleares IV. Flora de Ibiza

En este trabajo se presentan 21 táxones procedentes de diferentes localidades de la isla de Ibiza, 13 de los cuales suponen nuevas citas para el archipiélago balear y los restantes son especies poco conocidas en estas islas. Se destaca Discosporangium mesarthrocarpum (Falkenb.) Hauck, desconocida hasta ahora en las costas mediterráneas españolas y escasamente citada en el resto de este mar.

Dades sobre la biologia d'especies iberico-baleariques d'Artemisia L.

S'estudien diversos aspectes de la biología de les especies ibèrico-baleàriques Artemisia L., fonamentalment de les seccions Artemisia L.i Seriphidium Besser. La germinació de les cipseles, el tipus de cicle biològic, la biología de la reproducció i la fenologia són els principals termes tractats.

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.

Estudi Biosistemàtic de les poblacions de Ferula communis del NE de la Península Ibèrica i de les illes Balears.

Biosystemalic study of the Ferula communis populations in NE of the Iberian Peninsula and in the Balearic Islands. this paper presents the results of a taxonomic revision of the collective species Ferula communis L. (Umbelliferae) in NE of the Iberian Peninsula and Balearic Islands. The main goal of the research has been to characterize the Ferula communis populations in the region under study and to place them into infraspecific taxa. The proposed classification is based on morphology, anatomy, phenology, karyology and numerical taxonomy. A new taxon is described: Ferula communis L. subsp. cardonae Sanchez-Cuxart and Bernal and two new nomenclatural combinations are proposed: Ferula communis L. subsp. catalaunica (Pau) Sanchez- Cuxart and Bernal and Ferula communis L. subsp. catalaunica var. microcarpa (Cauwet-Marc) Sanchez-Cuxart and Bernal. Description, phenology and chorology for each taxon are included. Also an identification key for infraspecific taxa and a list of new localities are provided.

Els bancs de dades de la flora dels Països Catalans

Data banks on the flora of the Catalan Countries. Two data banks on the flora of the Catalan Countries (NE and E of the Iberian Peninsule and Balearic Islands) have been set up by the Secció de Ciències of the Institut d'Estudis Catalans (I.E.C., Institute of Catalan Studies). One is devoted to bibliography and the other to floristics, in this first phase concerned only with vascular plants. The sources are all types of publications containing concrete information on the vascular flora of the Catalan Countries. The information is transcribed on precoded forms so as to standardize the data and thus permit homogeneous input for subsequent storage in the computer. The coding schemes and characteristics of the forms are described for each of the data banks. Only the phytocoenological inventories receive special treatment which is discussed withreference to the floristic data bank. A first issue is annexed: the bibliografy concerning the vascular flora of Catalan Countries (years 1983 and 1984).

Lecanora balearica sp. nov., nuevo liquen epifitico de las islas Baleares

CRESPO, A. and X. LLIMONA (1981). Lecanora balearica sp. nov., nuevo liquen epífito de las Islas Baleares. Anales Jard. Bot. Madrid 38(l):25-28. Se describe una nueva especie epifltica del género Lecanora (Lecanoraceae, Lichenes) recolectada en Ibiza y Cabrera.

Constructive micritic envelope developed in the vadose continental environment in the Pleistocene eoliantes of Mallorca (Spain)

In this study we analyze and explain the formation of the constructive micrite envelope in the vadose continental environment. This constructive micrite envelope shows a wide variety of textural components. The principal textural components are: microorganisms, micritic and microspar LMC cement, whisker crystals, microfibres and aggregates of LMC acicular crystals. The main microorganisms are hyphae fungi, although actynomicetes and bacteries also occur. The constructive micrite envelope is due to the action of calcified filaments (hyphae fungi) which collapse and coalesce forming an intertwined mesh as well as due to the precipitation of micritic and microspar cement. The whisker crystals, microfibres and aggregates of LMC acicular crystals are secondary microtextures. Constructive micrite envelopes does not indicate a specific diagenetic environment. The constructive micrite envelopes present irregularities or bumps at the outer surface of the grains, and the destructive micrite envelopes present irregularities towards the grain interior. This morphologic criterion is useful to differenciate the micrite envelope origin, constructive or destructive, in the fossil record.

Macromicets de l'illa de Menorca.II.

Donem a conèixer els resultats de les prospeccions micològiques realitzades a Menorca entre els anys 1980 i 1988, i els presentem en forma de catàleg. S'han estudiat 193 tàxons (10 Ascomycetes i 183 Basidiomycetes), dels quals 127 creiem corresponen a citacions noves per a l'illa, entre els quals destaquem: Agaricus pequinii (Boud.) Konr. & Maubl., Amanita boudieri Barla, Dermoloma pseudocuneifolium Henrink, Hebeloma sarcophyllum (Peck) Sacc., Inocybe tenebrosa Quél., Psathyrella ammophila (Dur. & Lev.) Orton, Lactarius cistophilus Bon & Trimb. Russula seperina Dupain i Battarraea phalloides (Dicks.) Pers

Contribució a la flora dels macromicets de l'illa de Mallorca

Com a resultat de les prospeccions micològiques realitzades a Mallorca entre els anys 1983 i 1990, donem a conèixer un catàleg de 218 taxons (8 Ascomycetes i 210 Basidiomycetes), dels quals creiem que 74 corresponen a citacions noves per a l'illa. En destaquem, entre d'altres: Cordyceps militaris (L.) Link, Daldinia vernicosa (Schw.) Ces. et de Not., Dichomitus campestris (Quél.) Domanski et Ori., Agaricus lanipes (Moell. et Schaeff.) Sing., Amanita boudieri Barla, Clitocybe lituus (Fr.) Metr., Hygrocybe reai Mre., Inocybe tenebrosa Quél., Leucopaxillus tricolor (Peck) Kühn, i Russula seperina Dupain.

Primers resultats dels estudis dels elements marmoris del jaciment de l'antiguitat tardana del Pla de Ses Figueres de l'illa de Cabrera

El Pla de ses Figueres és un jaciment que es troba a la riba del port de Cabrera, una petita illa de 1.836 ha. situada en el sud de les illes Balears. Diversos treballs de prospecció i d’excavació han donat a conèixer una important ocupació humana del lloc centrada en els segles V a VII dC. A les zones intervingudes s’han identificat una factoria de salaons, un possible taller de producció de porpra i una necròpoli. En el present treball s’exposaran set peces de marbre localitzades en dit jaciment dintre del projecte “Recuperació, consolidació i museïtzació del monestir bizantí de l’illa de Cabrera”, el qual ja fa dotze anys que finança ininterrompudament l’Ajuntament de Palma.

Heritability and quantitative genetic divergence of serotiny, a fire-persistence plant trait.

BACKGROUND AND AIMS: Although it is well known that fire acts as a selective pressure shaping plant phenotypes, there are no quantitative estimates of the heritability of any trait related to plant persistence under recurrent fires, such as serotiny. In this study, the heritability of serotiny in Pinus halepensis is calculated, and an evaluation is made as to whether fire has left a selection signature on the level of serotiny among populations by comparing the genetic divergence of serotiny with the expected divergence of neutral molecular markers (QST-FST comparison). METHODS: A common garden of P. halepensis was used, located in inland Spain and composed of 145 open-pollinated families from 29 provenances covering the entire natural range of P. halepensis in the Iberian Peninsula and Balearic Islands. Narrow-sense heritability (h(2)) and quantitative genetic differentiation among populations for serotiny (QST) were estimated by means of an 'animal model' fitted by Bayesian inference. In order to determine whether genetic differentiation for serotiny is the result of differential natural selection, QST estimates for serotiny were compared with FST estimates obtained from allozyme data. Finally, a test was made of whether levels of serotiny in the different provenances were related to different fire regimes, using summer rainfall as a proxy for fire regime in each provenance. KEY RESULTS: Serotiny showed a significant narrow-sense heritability (h(2)) of 0·20 (credible interval 0·09-0·40). Quantitative genetic differentiation among provenances for serotiny (QST = 0·44) was significantly higher than expected under a neutral process (FST = 0·12), suggesting adaptive differentiation. A significant negative relationship was found between the serotiny level of trees in the common garden and summer rainfall of their provenance sites. CONCLUSIONS: Serotiny is a heritable trait in P. halepensis, and selection acts on it, giving rise to contrasting serotiny levels among populations depending on the fire regime, and supporting the role of fire in generating genetic divergence for adaptive traits.