A HISTORY OF SUSSEX 



of the rarer kinds, and Mr. Roper examined those of the Cuckmere. 

 Of the Desmideas, D. Swartzii, Ag., was discovered near Rotherfield by 

 Borrer. Doubtless our rivers contain many unrecorded species. In the 

 Ems I have noticed Batrachospermum in abundance. It comes to maturity 

 both in spring and autumn. From our estuaries, just above the influence 

 of the tide, additions to our lists are still to be made. Of the Diato- 

 maces about 150 have been recorded. 



This list is arranged according to Harvey's Manual. 



CYANOPHYCEi^ 

 Chroococcace^ 



Protococcus irridis, Ag. Hastings 



— pluvialis „ „ 



NOSTOCACE^ 



Nostoc caeruleum, Lyngb. Hastings 



— variegatum, Moore. „ 



OsCILLATORIACE^ 



Oscillatoria limosa, Vauch. Hastings 

 ■ — ■ autumnalis, Ag. Eastbourne 

 Lyngbya muralis, Ag. Hastings 



— ferruginea, Ag. Brighton 



RlVULARIACE^ 



Rivularia nitida, Ag. Brighton 

 CHLOROPHYLLOPHYCE^ 

 Palmellace^ 



Palmella cruenta, Ag. Hastings 



ZOOSPORES 



CoNFERVACEi^ 



Cladophora glomerata, L. Hastings 

 ■ — crispata, Ag. „ 



Conferva crassa, Ag. „ 



CONJUGATEiE 



Zygnema curvatum, Ag. Henjield 



— quininum, Ag. Hastings 



OOSPOREiE 



Vaucheriace.^ 



Vaucheria sessilis, De C. Hastings 



Carpospore^ 



Drapurnaldia plumosa, Ag. Hastings 

 Batrachospermum moniliforme, Ag. Hast. 



— atrum, Borr. Brighton 



MARINE ALG^ 



The marine algae do not abound on the Sussex coast as on the 

 shores of our western counties. We meet with comparatively few sea- 

 weeds as we proceed eastward until we approach Brighton and Beachy 

 Head, where they become more numerous, as well as at St. Leonards 

 and Hastings further on. We have lists of them by some of our societies 

 and an excellent account by Mrs. Merrifield in her Natural History of 

 Brighton and its Vicinity, but a good monograph of the Sussex algs is 

 still a desideratum, and in such should be differentiated those growing 

 within tide marks from waifs and strays. The occurrence of algas in 

 certain localities seems in some cases to be periodical, and as instances 

 Mrs. Merrifield states that in 1849 the rare and beautiful Griffithsia 

 barbata, Delesseria hypoglossum, Halymetna ligulata, Ginatinia f ur eel lata, the 

 lovely Naccaria Wiggii and the Dudresnaia coccinea, usually considered so 

 rare, were found at Brighton abundantly, and again in 1858 says: 

 ' During this present year the collectors of seaweeds have had an 

 abundant harvest, no less choice in quality than prolific in species. 

 Among the rarer algse I picked up Arthrocladia villosa, Sporochnus pcdun- 

 culatus, Cutleria multifida and Taonia atomaria, the seaweed which 

 resembles a peacock's tail ; but the greatest rarities in this district were 

 Griffithsia barbata, Seirospora Griffithsiana and CalUthamnion plumula, neither 

 of which were previously found at Brighton. Dudresnaia coccinea was 



62 



