BOTANY 



twenty which it may claim for its own, the remaining species being 

 common to both counties. 



The following lists have been compiled from Brady's Catalogue of 

 Marine Alga of Northumhcrlaml and Durham ; Transactions of the Tyneside 

 Field Club, 1858-60, iv. The nomenclature is that of Holmes and 

 Batters. 



Out of a total of 535 species — excluding varieties— of marine algas 

 which are found to grow upon the shores of the British Isles, only 136 

 are known upon the Durham coast. These are distributed among the 

 different orders as follows : — 



Total for British Isles. Total for Durham. 



Cyanophyceae . . . 57 . . . 5 



Chlorophyceie . . . 98 • . .18 



Phsophycea . . .144 . . .43 



Rhodophycese . . . 236 . , , 70 



No permanent habitat is known for the following species. They 



have been found from time to time washed up by the sea on this coast, 



and are therefore included in the list. It is most probable, however, 



that they have been merely carried by oceanic currents to our shores. 



Codium tomentosum, Stackh. Sargassum bacciferum, C. Ag. 



Halurus equisetifolius, Kiitz. Cystoseira ericoidcs, C. Ag. 



Gymnogongrus norvegicus, J. Ag. Himanthalia lorea, Lyngb. 



Calliblepharis ciliata, Kiitz. Arthrocladus villosa, Duby. 



Delcsseria Hypoglossum, Lamx. Dictyopteris polypodioides, Lamx. 



Polysiphonia byssoides, Grev. Dictyota dicliotoma, Lamx. 



LIST OF MARINE ALG^E 



CvANOPHYCB^ Chlorophvce^ {continued) 

 OicUlariaceiS Bryopsidacees 



Spiruiina tenuissima, KUtz. Bryopsis plumosa, C. Ag. 



Oscillaria Coralliiije, Gom. Codiaceee 



Rivulartacete Codium tomentosum, Stackh. 



Calothrix confervicola, C. Ag. 



— scopuiorum, C. Ag. Ph.«ophyceve 

 Rivularia atra, Roth. Desmaresiiace^e 



Chlorophyce^ Desmarestia viridis, Lamx. 



Uhacea — aculcata, Lamx. 



Monostroma Grevillii, J. Ag. — ligulata, Lamx. 



Enteromorpha clathrata, J. Ag. Dictyoiiphonacea 



— compressa, Grev. Dictyosiphon fctniculaccus, Grcv. 



— Linza, J. Ag. Punctariacea 



— intcstinalis, Link. Punctaria plantaginca, Grcv. 

 Ulva latissima, J. Ag. Aiperococcacea 



Cladophoraceie Asperococcus echinatus, Grcv. 



Urospora flacca. Holm. & Batt. Ectocarpaceix 



Chactomorpha crassa, KUtz. Streblonema velutinum, Thur. 



Rhizoclonium riparium Ectocarpus longifructus, Harv. 



— tortuosum, KQtz. — patens, Holm. & Batt, 

 Ciadophora utriculosa, KQtz. — tomentosus, Lyngb. 



— rupestris, KQtz. Isthmoplea sphaerophora, Kjellm. 



— gracilis, GrifiF. Pylaiclla litoralis, Kjellm. 



— flexuosa, Griff. Arthrocladiacea 



— fracta, KQtz. Arthrociadia villosa, Duby, 



— arcta, KQtz. Ehuhhtacete 



— lanosa, KQtz. Elachista fucicola, Fries. 



I 73 ^o 



