“…The first group includes species with more stenothermal temperature requirements: Acrosiphonia arcta, Acrosiphonia sonderi, Urospora penicilliformis, Devaleraea ramentacea, Desmarestia aculeata, Pilayella littorah's, Chromastrum secundatum, Chromastrum virgatulum, Chordaria flagelliformis. These algae displayed a high degree of cold adaptation with respect to the growth ranges (mostly 0-15 ~ and optima (0-10 ~ The USL's (17-23 ~ were however -with the exception of C. secundatum and D. ramentacea -similar to those of algae from the cold-temperate regions (Bolton & Lfining, 1982;Lfining, 1984;Lfining, 1985;Liining & Freshwater, 1988;tom Dieck, 1992btom Dieck, , 1993Wiencke & tom Dieck, 1990). The second group includes species with more eurythermal temperature requirements: Enteromorpha clathrata, Enteromorpha intestinalis, Pol ysiphonia urceolata, Ulva lactuca, Chaetomorpha tortuosa, Bangia atropurpurea, Eudesme virescens.…”