B. Papp szerk.: Studia Botanica Hungarica 30-31. 1999-2000 (Budapest, 2000)

Csontos, Péter, Lőkös, László; Molnár, Katalin: Numerical analysis of lichen zones in Komárom, NW Hungary

built-up areas are found in the group marked by number 1. This group has a fairly good agreement with group 3 of the global optimization dendrogram (cf. Fig. 2), while groups marked by number 2 and 3 correspond to the sampling sites with small group of trees inside the built-up areas. All sampling sites of the latter two groups are members of group 4 in the global optimization method. Sampling sites found in the city of Komárom and characterized by calcareous stones (either man-made concrete or hewn limestones) can also be distinguished by their lichen flora (see group 4 in Fig. 3). Results of the multivariate analysis by complete linkage method Three groups can be interpreted in the dendrogram of the complete linkage method. The first group is formed by sampling sites where the lichen specimens were found principally on tree barks (number 1 in Fig. 4). In case of groups 2 and 3 the lichen specimens were collected mainly from the concrete substrate or, less frequently, from tombstones (number 2 and 3 in Fig. 4). Though the substrate of I °

5 r g2 g3 g4 Fig. 3. Dendrogram of the sampling sites according to the group average method. Dissimilarity was measured by the Jaccard-index. Groups (gl-g4) are discussed in the text.