Clare Island Survey — Marine Algae. 15 119 



have friends in England or Wales, to whom I have written, been able to detect 

 it on the shore. Professor Harvey Gibson kindly sent a plentiful supply from 

 the Isle of Man : and stated that the plant is frequent in the pools at Tort 

 Erin (Bradda Head), but was not noted elsewhere. Judging from certain 

 statements in his memoir ('00), it was probably established there in 1900. 

 The herbaria examined were as follows : — Kew, British Museum (including 

 Herb. Batters), Trinity College, Dublin (including Herb. Harvey), National 

 Museum, Dublin ; Birmingham University (Herb. Holmes), and Cambridge 

 University ; Edinburgh University (including Herb. Greville). 



Phoeococcus adnatus West, comb. nov. 



{Gloeocystis adnataN'tig., Batters Cat., p. 9). 



Owing to the difficulty in ascertaining the correct group to which it 

 belonged, this alga caused considerable trouble, and was ultimately 

 determined by Professor G. S. West. The plant was imperfectly described 

 by Cooke and Babenhorst under the name of Gloeocystis adnata Xiig., and was 

 listed thus by Batters (I.e.). It is recorded from four localities in England ; and 

 was added to the Irish flora during the Lambay Survey. In Clew Bay it is 

 common, forming a definite zone of dull-yellow colour on the vertical peat- 

 banks (p. 82;. Professor West informs me that the species certainly belongs to 

 the Phoeophyceae, and should be removed from Gloeocystis to Phoeococcus ; 

 also that he hopes to - publish shortly an account of the genus, and will 

 include observations on the minute structure of the present speoies. 



Phoeostroma pustulatum Kuck. 



The alga here referred to is the plant not uncommon on the tips of 

 Laminaria mccharina var. Phyllitis, and which was identified as P. pustulatum 

 by Batters (Journ. Bot., xxxiii, p. 275). It appears to differ slightly from 

 Kuckuck's plant ; and further investigation may show that it should be 

 separated as a distinct species. 



Litosiphon pusillus Harv. 

 Abundant on Chorda, Zostera, and not uncommon on other algae. 

 Occasionally it is found on rock amongst such species as Phodoc/iorton 

 floridulum. 



Stictyosiphon adriaticus Kiitz. 



A few specimens of this species, which is new to British flora, were 



dredged in Clew Bay (in 3 fathoms) during May, 1911. They were noted as 



unfamiliar on dredging, and were ultimately referred to Kjellmania sorifera 



Keinke. Dr. Kuckuck, to whom a fragment was sent, confirmed the 



