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A revision of the genus Dasya in northwestern Iberian Peninsu- la is presented. Three species (Dasya hutchinsiae, D. ocellata and D. sessilis) are confirmed whilst other three (Dasya corym- bifera, D. punicea and D. rigidula) are excluded from the Gali- cian seaweeds flora. The alien species Dasya sessilis Yamada is a new record for the European Atlantic coasts. The study of the herbarium material reveals that D. sessilis was misidentified with other Dasyaceae species and that it has been collected on the Galician coasts for more than 16 years. Morphological and anatomical features of D. sessilis as well as its distribution and chronological data on the Galician coasts are provided. A com- parison of the Iberian specimens with the Mediterranean and Asian plants is also included. Dasya sessilis was found growing on a wide range of substrata, from the lower intertidal to sub- tidal at moderate wave-exposed and sheltered areas. It is abun- dant in harbours and aquaculture areas together with other alien species such as Heterosiphonia japonica and Undaria pin- natifida. The comparative study between D. sessilis and similar European and Iberian Dasyaceae species is undertaken to pre- vent further misidentifications. Dasya sessilis is the largest Dasya species, with broader main axes (1-2 mm wide vs 200- 500 µm in D. ocellata and 500-600 µm in D. hutchinsiae); pseudolaterals of D. sessilis are 3-5 times pseudodichotomous- ly branched compared to 5-8 times in D. hutchinsiae and 4-5 times in D. ocellata; pseudolateral tips are broader in D. sessilis than in D. ocellata, but smaller than pseudolateral apices of D. hutchinsiae; tetrasporangial stichidium of Dasya sessilis has 6-7 periaxial cells (and 6-7 tetrasporangia) per fertile whorl vs. 4-5 in the rest of the native species; and tetrasporangial stichidia of D. sessilis are longer and cystocarps broader than those in D. hutchinsiae. The alien Dasyaceae species Heterosi- phonia japonica, similar in size to Dasya sessilis, differs from it in main axes branching (alternate or distichous in H. japonica vs. spiral in D. sessilis), the number of periaxial cells in the vegeta- tive axes (4 in H. japonica vs. 5 in D. sessilis), and color (pinkish red vs. deep red). Other distinctive characters are the tips of main axes (70-90 µm wide in H. japonica vs. 100-130 µm in

anales del jardín botánico de madrid/anales del jardín botánico de madrid

Revision of the genus Dasya (Ceramiales, Rhodophyta) in Galicia (NW Spain) and the addition of a new alien species Dasya sessilis Yamada for the European Atlantic coasts