302 



MASSEE : MARINE ALG/E OF SCARBOROUGH. 



Bryopsis plumosa Huds. 

 Carnelian Bay. 



Scytosiphon lomentarius Lyng. ( = Chorda lomentaria Lyngb.) 



Carnelian Bay. 

 Scytosiphon filum Lamx. 



Carnelian Bay. 

 Punctaria plantaginea Roth. 



Rock pools, South Bay. 

 Desmarestia aculeata Lamx. 

 Dictyosiphon fceniculaceus Grev. 



South Bay. 



Myriotricha clavseformis Harv., var. filiformis ( ^ Myriotricha 

 filiformis Harv.) 



On various small algae in rock pools, South .Bay and Car- 

 nelian Bay. 

 Ectocarpns tomentosus Huds. 



North Bay. 

 Ectocarpus fasciculatus Harv. 

 Ectocarpus littoralis Lyngb. 

 Ectocarpus siliculosus Lyngb. 



Round the Castle foot. 

 Sphacelaria cirrhosa Roth. 



On the smaller algse, Carnelian Bay. 

 Cladostephus verticillatus Lightfoot. 



Top of the outer reef. North Bay. 

 Myrionema vulgare Thuret ( = Myrionema strangulans Grev. ; 

 Myrionema punctiforme Harv.) 



Thuret has united the two British species along with Myrionema 

 7naculifo7'me Kutz. under the above name. He considers the 

 differences they present as being entirely due to habitat ; when 

 growing on filiform plants it completely surrounds the thread, 

 and is Myi'ionema strangiilans ; when growing on broad fronds 

 it forms a small pulvinate tuft, and is My^'ionema pnnctifoinne. 

 Elachistea fucicola Fr. 

 Elachistea scutulata Duby. 



Myriactis pulvinata Kutz. ( = Elachistea pulvinata Harv. ) 



The present genus is separated from Elachistea on account of 

 the absence of the long projecting coloured filaments which are 

 present, in addition to the paraphyses, in all true Elachisteae. 

 All the species are attached to the fronds of the larger brown 

 algae, and resemble tassels of fine threads springing from a solid 

 minute knob-like base. 



Naturalist. 



