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The OPTIMA Commission For Lichens is supporting an international project for a compilation of a generaI checklist of lichens of the Mediterranean region. This paper describes the history of the project and the present State of the Art, with some criticaI considerations about the delimitation 01' thc Mediterranean area for a lichen checklist, and a short outline of the main phytogeographic features of southern Europe, as far as lichens are concerned. It is slIggcsted that the national checklist prodllced in the framework of the project shollld become available on thc Internet, with a possibility of continuous updating by the international lichenological community.

This checklist of lichens and lichenicolous fungi of Morocco. based on a criticai assessment of literature data. inc\udes 210 genera and 1100 infrageneric taxa, 1058 of which correspond to lichenized and 42 to lichenicolous fungi. The Rif, with 549 infrageneric taxa, and the NW CentraI Region, with 531 taxa, are the two parts of thc country with the highest number of known taxa. They are followed by CentraI Atlas (395), Gran Atlas (297), Anti Alias (267). SW Centrai Region (188) and SW Region (116). The High Plains (45) and the area cali ed Hammadas (23), are the two subdivisions with the lowest number of taxa.

The currently known Tunisian lichen flora as deterrnined by a detailed literature survey, supplemented by herbarium studies including those on collections made by the author in 1973, is composed of 415 taxa (395 species, 3 subspecies, 13 varieties and 4 forrns); more detailed studies of neighbouring north African countries would suppose that this Tunisian list should be expanded by c. 40 %.

This checklist of the lichens of lsrael (including the Sinai Peninsula) is based on a screening of relevant literature and on the analysis of originai material; it includes 234 infrageneric taxa. The following taxa were not reported from lsrael in the previous literature: Bacidia naegelii, Clauzadea chondrodes, Collerna eoecophorum, C.jlaceidum, Dermatocarpon wa/thekii, Hyperphyscia adg/u/inata, Leeanora eh/aro/era, Lecidea lurida, Leptogium comieu/atum, Oehro/echia palleseens, Pelru/a eup/oca, Physcia semipinnata, P/acidiopsis dalmatica, Te/oschis/es vi//osus and The/enella hassei.

This paper contains a compete Iist of Iichenized and lichenicolous fungi of the Mediterranean part of Turkey. This area was delimited on the basis of the administrative subdivision of the Country, taking into account ali provinces adjoining the Mediterranean Sea, including the Egean region, plus some adjoining provinces with a quasi-Mediterranean c1imate. The checklist, which is mainly based on literature records, includes 459 infrageneric taxa, belonging to 128 genera. For each infrageneric taxon the fol1owing data are provided: name and basyonym with their references, literature records for the eleven provinces, and herbarium references, when no literature citation is available.

This first-approximation checklist of the lichenized and lichenicolous fungi of Ukraine is based on 270 papers which were listed in previous summarizing arlicles, plus several recent or previously overlooked lilerature reports, and on originai resuIts deriving from the revision of herbarium materia!. Approximately 80 new or previously overlooked records were added lo the previously known bibliography. The number of taxa accepted in the chccklist is: 269 genera, 1222 species, 21 subspecics and 16 varieties. 1147 species are consistently or facultativcly lichenized; 29 non-lichenized (but mainly not lichenicolous): and 46 are lichenicolous fungi (excluding lichenicolous lichens).