110 Notes on Marine Algos. By E. A. L. Batters. 



4. Elachista scutulata, {Duly.) — Always parasitical on the 

 stems of jffimanthalia lorea, forming raised hairy lumps on its 

 fronds. Not uncommon on a ledge of rocks lying a little to the 

 northward of Dodds' Well. 



5. Elachista velutina, {Fries.) — Parasitical on the thongs of 

 Himanthalia lorea, and often found in company with the preceding, 

 the two species sometimes intermixed on the same thong. It 

 forms light brown patches on the thongs of the HimanthaUa, and 

 is never so much raised as the preceding species. 



6. Elachista Grevillei, {Am.) — Parasitical on Cladophoraru- 

 pestris. Very rare indeed. I shall not give the exact locality 

 where this species is to be found, as there is but one pool near 

 Berwick in which it grows. This species, I believe, has been 

 found but once since its discovery by Dr. Greville in 1 852. My 

 specimens are in fine fruit, the first found in Britain. 



7. Sphacelabia plumosa, {Lyngl.) — Pare. Cast up amongst 

 sea refuse behind the pier and elsewhere. Berwick specimens of 

 this plant are very small when compared with specimens gathered 

 on the west coast of England. 



8. Ectocarpus fasciculatus, {Ha/rv.) — Rare. Found at the 

 Coves, Dodds' Well, and Burnmouth. 



9. Mtrioteichia pilipormis, (^ar«?.)— Parasitical on Aspero- 

 coccus echinatus in shallow pools between the pier and the 

 "Greenses." Pare. 



10. Polysiphonia Byssoides, (Grev.) — Pare. Cast up among 

 sea refuse. In looking through the collection of the late Dr. 

 Johnston, which Mrs Barwell Carter was kind enough to show 

 me, I noticed a specimen apparently of this species labelled Basya 

 coccinea var. It therefore appears that Dr. Johnston took this 

 for a variety of D. coccinea. A moment's reference to the micros- 

 cope however will serve to separate the two plants. The 

 main stems of P. hyssoides, as well as the branches, are marked 

 with three or four upright lines, the main stems of B. coccinea are 

 opaque. If sections of the stems of the two species are made the 

 difference is even more apparent, as then the eight internal tubes 

 of the Polysiphonia are plainly visible. Polysiphonia byssoides, 

 moreover, turns nearly black in drying. 



11. Polysiphonia pulvinata, {Spreng.) — Not uncommon on 

 algae and rocks between tide marks all along the coast. 



12. BoNNEMAisoNiA ASPARAGoiDES, {Ag.) — Pare. Cast up a- 

 mongst sea refuse during the summer months, often in consider- 



