Fróðskaparrit - 01.01.2001, Side 90

Fróðskaparrit - 01.01.2001, Side 90
94 SEAWEEDS OF THE FAROEISLANDS AN ANNOTATED CHECKLIST tween hollow and solid stiped Laminaria plants in the North Atlantic with and with- out mucilage ducts (Chapman, 1974; 1975; Liining et al., 1978; Bolton et al., 1983). This suggests that all the plants are closely related or may belong to the same species, for which the epithet L. saccharina has pri- ority. This was challenged by Egan and Yarish (1990) who argued that L. longi- cruris has a distinctive morphology with a characteristic swelling of the upper part of the stipe separating it from L. saccharina. Non digitate Laminaria plants with hol- low stipes have also been observed in shel- tered localities in southwestem Scotland (Parke, 1948), the Shetland Isles (Kain, 1976) and in eastern Iceland (Sjotun and Gunnarsson, 1995). In these localities no extemal morphological features were found that distinguished the hollow stiped plants from the solid stiped L. saccharina growing amongst them. Therefore, all plants were referred to L. saccharina by the respective authors. The Faroese plants agree with L. longi- cruris in respect to stipe morphology, how- ever, as the taxomomic situation in this complex is still unclear, the name L. faeroensis is retained in the present paper pending further studies. Small epi- and endophytes associated with larger algae were commonly recorded; brown algae referable to genera as Chil- ionema, Myrionema, Phaeostroma and Strehlonema were difficult to identify. It is likely that some represent microthalli of larger brown algae. An interesting continu- ation for future research would be studies that involve detailed observation of such plants in culture supported by molecular work to assist possible identification. The identification of Ceramium species was also a challenge due to the variation within species as reflected by the large number of subspecies (cf. Petersen, 1911). Ceramium pallidum, C. rubrum and C. se- cundatum were identifieđ with reservation; characters used were general morphology, number of segments between primary branching points, number of periaxial cells and only little attention to the development of cortex. The status of C. atlanticum, C. boergesenii needs confirmation and the same concems the C. diaphanum recorded by Irvine (1982). To obtain a better under- standing of species complexes in this genus, culture studies with crossing exper- iments and molecular investigation are re- quired. The Cyanophycean flora of the Faroes needs further studies, in the present study 18 species were identified. Borgesen (1902) recorded 14 species of Cyanophyceae of which all except 3, i.e. Calothrix aeruginea (Kiitz.) Thur. ex Bor- net & Flahault, Chlorogloea tuberculosa (Hansg.) Wille and Schizothrix tenerrima (Gomont) Drouet (as Microcoleus ten- errimus Gomont), were found in the pre- sent study. Irvine (1982) recorded 9 species of Cyanophyceae. But as he applied the classification system of Drouet and Daily (Drouetand Daily, 1956; Drouet, 1968), his records can not be directly compared with ours. Holt (1975, unpublished report) recorded a few species not recorded by oth- ers. We suppose that detailed investigations including culture studies may confirm
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