Joso Vukelić

Additions to the bryophyte flora of Croatia

In the paper 21 new bryophyte species for the flora of Croatia are presented. They originate from three regions in Croatia: Papuk Mt, Velebit Mt and Gorski kotar. For each species exact localities, habitats, and other data concerning conservation status, general distribution and distribution in the Balkans are provided.

Nomenclatural-Phytocoenological Analysis of the Association Potentillo Micranthae-Quercetum Petraeae Ass. Nova in Croatia

Nomenclatural-Phytocoenological Analysis of the Association Potentillo Micranthae-Quercetum Petraeae Ass. Nova in Croatia Phytocoenological traits of forests of sessile oak in the area of Zrinska Gora were investigated in 2009. Phytocoenological research was conducted using a method of the Zürich-Montpellier School. A comparison was made with acido-thermophilic forests of sessile oak from central and north-western Croatia, then from Slovenia and the Mescek Mountains in Hungary. A statistical comparison was made by entering all the phytocoenological relevés into the Turboveg database. This was followed by a classical synthetic analysis of the phytocoenological relevés and a multivariate analysis using Syntax 2000 software. Average Ellenbergs values were calculated for each relevé with JUICE 6.3 software. Taking into consideration all the facts, it can be concluded that the newly established association Potentillo micranthae-Quercetum petraeae shows a high degree of independence and differentiation from other similar associations described to date. In relation to others, it is poorer in species, both in terms of the systematic categories to which it belongs and the number of elements from the orders of Fagetalia and Quercetalia pubescentis. Of the species occurring in acidophilic forests of sessile oak, Genista tinctoria, Chamaecytisus hirsutus and Dicranella heteromalla can be considered characteristic species, whereas Galium sylvaticum, Cephalanthera longifolia, Dianthus armeria and Viola alba can be termed differentiating species. The species Potentilla micrantha, Festuca drymeia and Luzula forsteri are very important for the structure, physiognomy and syndynamics of the association. It is subordinated to the alliance Quercion robori-petraeae, the order Quercetalia robori-petraeae and the class Querco-Fagetea. V letu 2009 smo preučevali fitocenološke značilnosti gozdov gradna na območju Zrinske gore. Raziskavo smo naredili z metodo Züriško-Montpellierske šole. Primerjali smo acidofilno termofilne gradnove gozdove iz srednje in severozahodne Hrvaške s podobnimi iz Slovenije in hribovja Mecsek na Madžarskem. Za statistično primerjavo smo zbrali fitocenološke popise v bazi Turboveg. Sledila je klasična sintetska analiza fitocenoloških popisov in multivariatne analize s programom Syntax 2000. Povprečne Ellenbergove indikacijske vrednostiza posamezen popis smo izračunali s programom Juice 6.3. Primerjava nove asociacije Potentillo micranthae-Quercetum petraeae kaže visoko stopnjo neodvisnosti in razlik od podobnih dotedaj opisanih asociacij. V primerjavi z njimi je preučevana asociacija vrstno siromašnejša, tako v številu sinsistematskih kategorij kot po številu elementov iz redov Fagetalia in Quercetalia pubescentis. Za značilnice, ki se pojavljajo v acidofilnih gradnovih gozdovih lahko imamo vrste Genista tinctoria, Chamaecytisus hirsutus in Dicranella heteromalla, medtem ko vrste Galium sylvaticum, Cephalanthera longifolia, Dianthus armeria in Viola alba označimo kot razlikovalnice. Vrste Potentilla micrantha, Festuca drymeia in Luzula forsteri so zelo pomembne za strukturo, fizionomijo in sindinamiko asociacije. Uvrščamo jo v zvezo Quercion robori-petraeae, red Quercetalia robori-petraeae in razred Querco-Fagetea.

Phytocoenological analysis of grey alder (Alnus incana L.) forests in the Dinarides of Croatia and their relationship with affiliated communities

This paper provides a comprehensive survey of the results of phytocoenological research into Alnus incana forests from the alliance Alnion incanae in the Dinarides. Stands from the south-eastern Dinar-ides (Alnetum incanae = Oxali-Alnetum incanae) were analyzed and compared with those from the north-western Dinarides (Lamio orvalae-Alnetum incanae). The comparison reveals significant differ-ences in the floristic composition and in the degree of differentiation – and particularly in the presence of the species of the Illyrian floristic geoelement. Focus was placed on the area of western Croatia where a geographic variant of Helleborus dumetorum had previously been de-fined within the association Lamio orvalae-Alnetum incanae. Two of its subtypes, Salix alba and Alnus glutinosa, were determined in our research. The former subtype thrives on occasionally flooded, moist sites, where the floristic composition is dominated by hygrophytes. The latter subtype grows on elevat-ed and drier terraces and is richer in mesophilous species from the surrounding zonal forests. A floris-tic-sociological comparison of the Lamio orvalae-Alnetum incanae with the related syntaxa indicates the presence of about fourty diagnostic species which accentuate its independence and the need to assess it at the level of an independent, regional association within the alliance Alnion incanae.