372 Further Note on the AlgcB of the Elf Loch. [Sess. 



180. Porphyridium cruentum (Ag.) Nag. {= Palmella cruenta Ag. and 

 AphaTiocapsa cruenta (Ag.) Hansg.) 

 The systematic position of this Alga is very uncertain. It has 

 been placed by various authors among the Chlorophycese, 

 and also among the Rhodophycese. It forms dark blood -red 

 patches on damp earth, and mainly at the bases of walls. 

 I have found it only in two or three places in Edinburgh, 

 but it seems to be far more common in the West of Scotland, 

 where it can be got, especially during the winter months, on 

 garden walls and railway viaducts. 



:LI.— FURTHER NOTE ON THE ALG^ OF THE 

 ELF LOCH. 



By Mr F. L. M'KEEYER, F.E.M.S. 



{Read April 26y 1911.) 



In addition to the short list published m the ' Transactions ' 

 for Session 1909-1910, I now give the following species of 

 Algae found in the Upper Elf Loch during 1910 and 1911. 

 The Desmidiaceae, Diatomaceae, and Peridinieae have not been 

 included in this list. To my great regret, I have been 

 unable to find this year two Algae of special interest found 

 here in previous years — namely, Characiopsis turgida W. & 

 G. S. West, one of the Heterokontae, and PJiceothamnion 

 confervicolum Lagerh., one of the few freshwater Phaeophyceae. 

 The numbers are continued from the last list (' Trans./ 

 p. 242). 



Class— PH^OPHYCEiE. 



8. Phceothamnion confervicolum Lagerh. 



First record for Great Britain (see ' Transactions and Pro- 

 ceedings of the Botanical Society of Edinburgh,' vol. 

 xxiv.. Part III., p. 176, 1911). 



Class— CHLOROPHYCE^ (including HETEROKONT^). 



9. Coleochcete scutata Brdb. 



10. Herposteiron confervicola Nag. 



11. Ulothrix suhtilis Kiitz. var. variabilis Kirchn. 



