L. Hably szerk.: Studia Botanica Hungarica 23. 1992 (Budapest, 1992)

Papp, Beáta: Phytocoenological survey along the Koloska stream (Balaton-felvidék region, Hungary)

Geranieto-Filipenduletum petasitetum hybridii This œmmunity is quite common near ditches and streams with rich nutrient and nitrogen supply. Generally the stands of this communities are small in size and hence their species composition is greatly influenced by the surrounding communities. Along the Koloska stream this community is represented in several small patches. In each of them Petasites hybridus dominates, while many individuals of Glycerio-Sparganion elements mix into this association e.g. Epilobium hirsutum, Epilobium parviflorum, Eupatorium cannabinum, Lythrum salicaria, Mentha longifolia, Mentha aquatica, Equisetum palustre, Equisetum arvense. A few Magnocaricion elements are also present e.g. Carex acutiformis, Carex riparia. Along the freshwater, where Petasites hybridus does not cover the surface completely, mosses, e.g. Cratoneuron füicinum, Calliergonella cuspidata grow. Scirpo-Phragmitetum This community generally occurs on river banks and lake shores where the stagnant water level is high in spring but later this habitat type becomes drier. The stand of Scirpo-Phragmitetum (C) extends for a very long stretch along the stream in the Koloska valley. It is interrupted by several patches of willow trees and in the western part of the valley where the stream runs in a deeper bed, by small patches of Glycerio-Sparganietum and Geranieto-Filipenduletum petasitetum hybridii. The appearance of the stand is rather uniform. Phragmites communis prevails in the community. Carex acutiformis and Carex riparia are present with high abundance. Several individuals of Glycerio-Sparganion elements can also be found e.g. Lythrum salicaria, Equisetum fluviatile, Eupatorium cannabinum, Epilobium hirsutum, Epilobium parviflorum, Lysimachia vulgaris, Lysimachia nummularia. Near the little brooklets many Scrophularia umbrosa and Sium erectum grow. On the W value diagram (Fig. 7), the high proportion of W=8, 9, 10 value species can be seen indicating the good water supply of this stand similarly to the Caricetum acutiformis ripariae (B). OJ /0 % SO-AO-302010-D d ,23 A 5 6 7 30 7060SO" AO" 3020 10 8 9 1011 W Wm, U KW E~ K TP TZ6Y 6 A NC Fig. 7. W- and NC value scatter diagram of Scirpo-Phragmitetum