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Anatomical properties of pedunculate oak (Quercus robur L.) wood have not been previously investigated in Serbia, so bearing in mind economic-productive and ecological significance of this species, it was one of the main reasons why this research was conducted. In this paper, fibre length (FL), double cell-wall thickness (DCWT) and fibre lumen diameter (FLD) were measured in pedunculate oak wood from two different sites. The study was conducted at two sites (Donji Srem – MU „Raškovica-Smogvica” and Gornji Srem – MU „Kupinske grede”), situated along the Sava River and characterised by different ecological conditions, including flooding regimes. Measurements were conducted in radial direction, from pith to bark, in order to assess variation of investigated characteristics with cambial age, between two sites and between individual trees within each site. All measured characteristics from both sites increase going from pith to bark apart from FL in the area of Donji Srem – MU „Kupinske grede” that reaches maximum value in the central part of xylem and then decreases. Hydrological site conditions affect the dimensions of pedunculate oak wood fibres and these values are a bit higher in Gornji Srem – MU „Raškovica-Smogvica”, due to a greater quantity of available water., Anatomska svojstva drva hrasta lužnjaka (Quercus robur L.) do sada nisu istraživana na području Srbije, a imajući na umu golemo značenje te vrste u ekonomsko-proizvodnome i ekološkom smislu, to je bio jedan od glavnih razloga za provedbu ovog istraživanja. U radu je izmjerena duljina vlakanaca (DV), dvostruka debljina stijenki (DDS) i promjer lumena vlakanaca (PLV) drva hrasta lužnjaka s dva različita staništa. Istraživanje je provedeno na staništima Gornji Srem – GJ „Raškovica-Smogvica” i Donji Srem – GJ „Kupinske grede”, koja se prostiru duž rijeke Save, a karakteriziraju ih različiti ekološki uvjeti, uključujući i režim plavljenja. Mjerenja su provedena u radijalnom smjeru, od srčike prema kori, kako bi se utvrdile varijacije istraživanih svojstava ovisno o starosti kambija, o različitosti dvaju lokaliteta te o razlikama među stablima unutar istog lokaliteta. Utvrđeno je da se sve izmjerene vrijednosti drva s oba lokaliteta povećavaju u smjeru od srčike prema kori, osim DV-a na području Donjeg Srema – GJ „Kupinske grede”, koji maksimalnu vrijednost dosežu u središnjem dijelu ksilema i potom se smanjuju. Hidrološki uvjeti staništa uvelike utječu na dimenzije drvnih vlakanaca hrasta lužnjaka i te su vrijednosti zbog veće količine raspoložive vode nešto veće u Gornjem Sremu, u GJ „Raškovica-Smogvica”.

The aim of this research was to examine the morphological characteristics of acorn in order to the determine differences between three species. In total, sixteen primary and two secondary parameters were measured and statistically processed. The present study included a total number of 400 acorns from three oak species (pedunculate, sessile and Turkey oak). Acorns were collected from four different sites. Pedunculate oak acorns were collected in Novi Sad and Bačko Petrovo Selo, while sessile and Turkey oak acorns were collected from two different sites at Fruska gora Mt. Following statistical methods were used in this paper: ttest, ANOVA, principal component analysis and analysis of correlation. The results of t-test pointed out statistically significant differences between all characters within two different sections. Statistically significant differences in the examined characteristics were also found between the acorns of two pedunculate oak populations collected at two different sites. The analysis of variance showed statistically significant differences between all investigated characters for all three oak species. The results of PCA pointed out that acorn mass, stalk length, nut length, nut diameter and nut out of cupule are the characteristics can be used to differentiate three mentioned oak species. The same patterns of correlations were established for all three examined oak species. The present study is discussing the significance of the results related to assessment of morphological characteristics of acorns for application in selection and breeding programmes.