Report of Fauna and Flora Committee — Irish Phceophycece. 451 



Eeinke (Atlas d. deutschen Meeresalgen) thinks Batters' 

 specimen of /. splicer ophor a, with, plurilocular sporangia, may 

 be Foslie's Pylaiella curta, which he names Fosliea curta, 

 though he admits the latter may be the plurilocular stage of 

 I. sphmrophora with which species it agrees in intercalary 

 growth and mode of branching, but differs in its base, which 

 is uniseriate and merismatic and not thick and pluriseriate as 

 in /. sphcerophora, Kjellm. 



Pylaiella, Bory. 



P. Utoralis, Kjellm. {Fctocarpus litoraUs, Phyc. Brit., pi. 197.) 

 1-12 inches long ; sporangia intercalary. 10-14. 



/. amphibia, Holm, et Batt. 12. (Fctocarpus amphthius, Phyc. 

 Brit., pi. 183.) 



Order YI. — Aetheocladiace^. 



Arthrocladia, Duby. 



Filamentous sori of unilocular sporangia, 

 A.vinosa,Duhj. 12 K 13 K 14 N. 



This southern extra-tidal weed is not known on the west or 

 extreme north coasts. Mrs. Gatty records it from the Down 

 and "Wicklow coasts. "We have frequently dredged it in the 

 districts named. 



Order YII. — Elachisteaceje, 

 Myriactis, Kiitz. 



M. pulvinata, Kiitz. [FlacMstea pulvinata, Phyc. Brit.) 10 H. 

 11 H. andN. 



Unilocular and plurilocular sporangia are known. It grows 

 parasitically on Cystoseira ericoides, C. foeniculaceus ; at Kilkee, 

 on Pesmarestia aculeata also. 



Elachistea, Duby. 

 F. scutulata, Duby. 



On all the coasts on Himanthalia lorea. 

 F.flaccida, Aresch. 11 H. 12. 



On Cystoseira fibrosa and C. granulata. 

 F. fucicola^ Fries. 



On all the coasts, on Fucus vesiculosus. 



