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 Algae of Northumberland 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 algae 

 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 

 Chlorophyceae . . . 98 . . .18 

 Phaeophyceae . . .144 . . -43 



Rhodophyceae . . . 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 ericoides, C. Ag. 



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



Calliblepharis ciliata, Kiitz. Arthrocladus villosa, Duby. 



Delesseria Hypoglossum, Lamx. Dictyopteris polypodioides, Lamx. 



Polysiphonia byssoides, Grev. Dictyota dichotoma, Lamx. 



LIST OF MARINE ALG-S 



CYANOPHYC&* 

 Oscillariactte 



Spirulina tenuissima, Kfltz. 



Oscillaria Corallinae, Gom. 

 Rivulariacttg 



Calothrix confervicola, C. Ag. 



scopulorum, C. Ag. 

 Rivularia atra, Roth. 



CHLOROPHYCEJE 

 Uhactte 



Monostroma Grevillii, J. Ag. 

 Entcromorpha clathrata, J. Ag. 



compressa, Grev. 



Linza, J. Ag. 



intestinalis, Link. 

 Ulva latissima, J. Ag. 



Cladophoracett 



Urospora flacca, Holm. & Batt. 

 Chaetomorpha crassa, Kutz. 

 Rhizoclonium riparium 



tortuosum, Ktltz. 

 Cladophora utriculosa, Kdtz. 



rupestris, KUtz. 



grac ills, GriflF. 



flexuosa, GrifiF. 



fracta, Kfltz. 

 - arcta, KOtz. 



laiiosa, Kutz. 



CHLOROPHYCEA (continued) 

 Bryopiidacete 



Bryopsis plumosa, C. Ag. 

 Codiaceee 

 Codium tomentosum, Stackh. 



PHXOPHYCRX 

 Desmarestiaceee 



Desmarestia viridis, Lamx. 



aculeata, Lamx. 



ligulata, Lamx. 

 Dictyoiiphonace<s 



Dictyosiphon foeniculaceus, Grev. 

 Punctarlacete 



Punctaria plantaginea, Grev. 

 Asperococcace<e 



Asperococcus echinatus, Grev. 

 Ectocarpacttt 



Streblonema velutinum, Thur. 



Ectocarpus long i I rue t us, Harv. 



patens, Holm. & Batt. 



tomentosus, Lyngb. 

 Isthmoplea sphaerophora, Kjellm. 

 Pylaiella litoralis, Kjellm. 



Artbrocladlactee 



Arthrocladia villosa, Duby. 

 E/achtstacete 



Elachista fucicola, Fries. 



73 



