OF NORTHUMBERLAND AND DURHAM. 273 



helVs Herb. Among the rocks at Hartlepool. — John Hogg.^ Esq. 

 Near Berwick. — Dr G. Johnston.^' — Winch. Abundant on the 

 coast north of Whitley, August, I860. —6-'. S. i?.— N. D. 



The plants of this genus, more especially D. viridis and D. 

 ligulata, begin to decompose almost immediately on their removal 

 from sea water, their natural deep olive or " foxy" brown colour 

 changing rapidly to a verdigris green; they at the same time 

 becoming tender and flaccid. This decomposition is conta- 

 gious, so that when gathered the Desmarestice should, if possible, 

 be kept separate from other AlgaB. To be preserved completely 

 they should indeed remain floating in sea water until they can be 

 laid out and dried. 



7. AUTimOCLADIA, Dnhj. 



1. A. viLLOSA, Duhy. Harv. Man., p. 24. Phyc. Brit., t. 64. 

 Atlas, PI. v., fig. 20. Johnst. and Cr., t. 144. 

 " On the beach near Whitburn. — W. WeighelVs Herb'' Winch. 

 — D. 



8. ALARIA, Grev. 

 1 . A. EscuLENTA, Grev. Harv. Man., p. 29. Phyc. Brit., t. 79. 

 Atlas, PI. VL, fig. 23. Johnst. and Cr., t. 146. 

 Fucus esculentus. E. Bot., t. 1759. 

 On rocks near low-water mark. Frequent. — N. D. Much 

 finer and more abundant on the Northumberland than on the 

 Durham coast. 



9, LAMINARIA, Lamour. 



1. L. CLOUSTONi, Edmonst. 



L. digitata. Harv. Man., p. 29. Phyc. Brit., t. 

 223. Atlas, PL VL, fig. 24. Johnst. and Cr., 

 t. 147. 

 On rocks in deep water. Common. — N. D. 



2. L. FLExicAULis, Lc JoUs. Lc Jolis in Mem. de la Soc. Imp. 



des Sc. Nat. de Cherbourg, tom. iii. (1855). 



