B. Papp szerk.: Studia Botanica Hungarica 29. 1998 (Budapest, 1999)

Papp, Beáta: Investigation of the bryoflora of some streams in Greece

giomnium undulatum. Its floristical composition is very different from that of the other investigated streams (Fig. 2) due to its situation at low altitude close to the sea. This is why the quantity of montane species is very low and a high proportion of suboceanic, sub-Mediterranean species can be observed. Although the species of temperate areas of Europe predominate (Fig. 3). The high proportion of colonists (Fig. 4) and the frequent, well-developed patches of Fissidens crassipes, a ß-mesosaprobic indicator species, indicate disturbing effects derived from the fluctuation of water supply and from human activity (plantations, domestic waste from the village). At the sources of Mirtia the most abundant species are Cratoneuron commutatum, Pellia endiviifolia, Conocephalum conicum, Hygroamblystegium tenax, and Rhynchostegium riparioides. The flora is similar to that of the stream of Mt Olympos (Fig. 2). Here only species of the temperate areas of Europe can be found. The lack of colonists and the high proportion of perennial species (71 %) show unchanging good environmental conditions at this source area. Beside the perennial species only a few short lived shuttle species were present (29%). The main components of the bryophyte flora of the stream in Mt Olympos are Cinclidotus fontinaloides, Cratoneuron commutatum, Didymodon tophaceus, Rhynchostegium riparioides, Brachythecium rutabulum, Thamnobryum alopecurum. The bryophyte flora of this stream and the sources of Mirtia are similar and they show close relations with some Spanish streams as well (Fig. 2). The floristical composition is predominated by temperate species, beside them boreal, montane and sub-Mediterranean, suboceanic species can be found representing the same proportion (Fig. 5). The bryoflora is mostly characterized by perennial species, the proportion of colonists is lower than in the flora of Parga'

s stream (Fig. 6). No remarkable disturbing effect can be detected by means of the aquatic bryophyte flora. The bryoflora of the stream of Mt Pilion is different from the other Greek streams investigated, but it is similar to some Hungarian streams (Fig. 2). The flora is very diverse. The presence of the north-suboceanic Rhizomnium punctatum, the subboreal Philonotis f

ontana and several species of Mniaceae (Mnium, Plagiomnium) is remarkable here beside the occurrence of several above mentioned species, such as Cratoneuron commutatum, Conocephalum conicum, Pellia endiviifolia, Brachythecium rutabulum, and Rhynchostegium riparioides. The floristical composition shows more central European features than the bryophyte flora of the stream in Mt Olympos. The total quantity of montane, boreal, subboreal species is considerable, while the presence of sub-Mediterranean, suboceanic, oceanic species and the proportion of temperate species is lower than in the Olympos'

s stream (Fig. 7).