Rare or otherwise interesting marine Algae from the Netherlands

Thanks to many collaborators, C. Brakman, C. den Hartog, Dr P. Korringa, J. A. W. Lucas, A. Mulder, J. G. Slope, B. J. J. R. Walrecht a.o. who sent Algae for identification to the Rijksherbarium and gave information about habitats, it is possible now to add new data to Van Goor’s work on the Netherlands marine Algae. However, a complete review of the larger marine Algae occurring in that country can only be given after such genera as Enteromorpha, Monostroma, Ceramium, Callithamnion and Ectocarpus will have been revised for the Netherlands. A Rhodophycea unknown from the Netherlands up to that time was collected by C. den Hartog and A. Mulder in 1950. It was identified by the first collector. This Alga, Dasya pedicellata (Ag.) Ag. (syn. D. elegans (Mart.) Ag.), Dasyaceae, was collected in one of the canals in Zeeland, which contain seawater “Kanaal door Zuid-Beveland”, Island of Zuid-Beveland. It was found growing in a great abundance in the same canal by several collectors in 1951. This locality is remarkable, for the species usually occurs in warmer regions: Mediterranean, Atlantic from southern Spain to Canaries (Feldmann p. 94), Antilles (Borgesen p. 317), Atlantic coast of North America from Florida to Massachusetts (Taylor p. 355) and Pacific coast of Baja California (Dawson p. 56). In Zuid-Beveland the species was found growing at a depth of 1—1J m. Taylor records a depth of 1—4 m and Feldmann dragged it from 25—30 m in the Mediterranean; Funk (p. 456—457) also records this species at a great depth in the Mediterranean, though occasionally he found it at a depth of 10 m and even in one case near the water-mark.