MARINE ALGAL VEGETATION 



61 



Pylaiella littoralis. 

 Ectocarpus confervoides. 

 E. siliculosus. 

 Scytosiphon Lomentaria. 



Enteromorpha intestinalis. 

 E. clathrata. 

 Ulva lactuca. 

 Chaetomorpha tortuosa. 



Spirulina subsalsa. 

 Calothrix scopnlorum. 



P h a? o p h y c e ae. 



Phyllitis fascia. 

 Fucus vesiculosus. 

 Ascophyllum nodosum. 



C h 1 o r o p h y c e ae. 



Rhizoclonium riparium. 

 Cladophora gracilis. 

 Gomontia polyrrhiza. 



C y a n o p h y c e a?. 



Rivularia atra. 



! 



D. The Cold-Boreal Group. 



The species of this group have their area of distribution from 

 western France — England northward to S. Iceland, the Faeroes 

 and Nordland— Finmark. Some few species have occasionally been 

 found in the Arctic Sea, especially in the White Sea and the 

 Murman Sea, and some few reach as far south as the Mediterranean 

 and North Africa. 



R h o d o p h y c e as. 



Porphyropsis coccinea. 

 Chantransia Alaria;. 

 Gigartina mamillosa. 

 Phyllophora membranifolia. 

 Cystoclonium purpurascens. 

 Lomentaria rosea. 

 Delesseria alata. 

 D. sanguinea. 

 Polysiphonia urceolata. 

 P. fastigiata. 

 P. nigrescens. 

 Callithamnion Arbuscula. 

 Plumaria elegans. 

 Antithamnion floccosum. 

 Ceramium acanthonotum. 

 C. Deslongchampii. 



Ceramium fruticulosum. 

 C. circinnatum. 

 C. altanticum. 

 Rhodochorton repens. 

 R. minutum. 

 Dumontia filiformis. 

 Dilsea edulis. 

 Petrocelis Hennedyi. 

 Rhododermis parasitica. 

 Lithothamnion Ungeri. 

 L. Lenormandi. 



Phymatolithon polymorphum. 

 Lithophyllum Crouani. 

 Dermatolithon macrocarpum. 

 Corallina officinalis. 



I 



P h se o p h y c e ae. 



Petroderma maculiforme. 

 Ralfsia verrucosa. 

 Myrionema vulgare. 

 M. Corunnse. 

 M. faeroense. 



Ascocyclus islandicus. 

 Microsyphar Polysiphonise. 

 Streblonema Stilophorae v. caespitosa. 

 Ectocarpus tomentosus. 

 E. penicillatus. 



