New mutagenous forms of Silver Fir and Common Beech from central Bosnia

Abstract

Two new mutagenous forms, in Silver Fir and Common Beech, are discribed in the paper, both represented by a single specimen only. The first is Abies alba Mill, f. intumescens Janjić, which is characterised by swollen trunk up to 3,5 m in hight, what is caused probably by very numerous ingrown proventive buds (similar as in Black Poplar, Populus nigra L. var. maserica Tucović ). In the new form of Common Beech, Fagus silvatica L. f. pseudograndidentata Janjić et Ballian, all leaves of the tree are coarsely and sharply toothed. In this case, it is assumed that the cause of the phenomenon is a generative mutation which occured in the earliest stage of develop­ment of the individual specimen,  in zygote or in the course of formation of gametes.