ioS 



The Irish Naturalist. 



February, 



further research will show that it is equally rich in species. 

 Up to the present time a little more than 200 species have 

 been found on the island, and of these no fewer than 20, 

 distinguished in the list by an asterisk, have not previously, so 

 far as I am aware, been recorded from the coasts of Ireland. 



MYXOPHYCEJE. 



♦Aphanocapsa marina, Hansg. 

 *Gloeocapsa crepidinum, Thur. 

 *Aphanothece pallida, Rabenh. 



Dermocarpa prasina, Bornet. 

 *D. Schousboei, Bornet. 

 *Pleurocapsa fuliginosa, Hauck. 



Hyella caespitosa, Born, et Flah. 



Lyngbya sestuarii, Liebm. 



L. majuscula, Harv. 



Symploca hydnoides, Kiitz. 



*Plectonema norvegicum, Gom. 



Calothrix confervicola, Ag. 



C. scopulorum, Ag. 



C. pulvinata, Ag. 

 *Dichothrix gypsophila,Born. et Flah. 



Isactis plana, Thur. 



Rivularia Biasolettiana, Menegh. 



R. atra, Roth. 



R. nitida, Ag. 



Mastigocoleus testarum, Lagerh. 



CHLOROSPERME^E. 



Chlorochytrium Cohnii, Wright. 

 *Gloeocystis adnata, Schm. 



Prasiola stipitata, Suhr. 

 *P. polyrhiza, Jons. 



Pringsheimia scutata, Rke. 

 ♦Ulvella confluens, Rosenv. 



Monostroma Grevillei, Wittr. 



Enteromorpha clathrata, J. Ag. 



E. torta, Reinb. 



E. compressa, Grev. 



E. Linza, J. Ag. 



E. intestinalis, Link. 



E. micrococca, Kiitz. 



Ulva lactuca, L. 



Ulothrix flacca, Thur. 



Bolbocoleon piliferum, Pringsh. 



Blastophysa rhizopus, Rke. 

 ♦Endoderma Wittrockii, Wille. 



Endoderma Flustrae, Batt. 



Tellamia contorta, Batt. 



Chaetomorpha tortuosa, Kiitz. 



C. serea, Kiitz. 



C. Melagonium, Kiitz. 



Rhizoclonium riparium, Harv. ,. 



Cladophora pellucida, Kiitz. 



C. Hutchinsise, Harv. 



C. rupestris, Kiitz. 



C. utriculosa, Kiitz. 



C. Balliana, Harv. 



C. arcta, Kiitz. 



C. lanosa, Kiitz. 



Gomontia polyrhiza, Born, et Flah. 



Bryopsis plumosa, Ag. 



Vaucheria sphserospora, Nordst. 



Codium tomentosum, Stackh. 



FUCOIDEJE. 



Desmarestia viridis, Lamour. 

 D. aculeata, Lamour. 

 Dictyosiphon foeniculaceus, Grev. 

 D. hippuroides, Kiitz. 

 Litosiphon pusillus, Harv. 

 Phoeospora brachiata, Born. 



Punctaria plantaginea, Grev. 

 P. tenuissima, Grev. 

 P. undulata, J. Ag. 

 Phyllitis Fascia, Kiitz. 

 Scytosiphon lomentarius, J. Ag. 

 Asperococcus fistulosus, Hook. 



