290 Marine Algvu of Berwick-on-Tweed. 



Myrionema punctiforme, Harv., in Honk., Br. FL, vol. n., p. 391 ; 



Harv., Phyc. Brit., pi. 41, B ; J. Ag., Spec. Alg. i., p. 49. 

 Myrionema maenliforme, Ktz., Tab. Phyc. vn., t. 93, f. 2. 

 Hah. Epiphytic on various Alga? between tide-marks. Summer and 

 Autumn. Fruit July and Aug. Common. Everywhere along 

 the coast. 



As Thuret has pointed out several of the species of Myrionema 

 of Harvey and Kutzing are nothing more than modifications of 

 one species. When growing on the filiform Enter omorpha the 

 Myrionema surrounds the frond and constitutes the Myrionema 

 strangulans of Greville, but when growing on flat surfaces, such 

 as the fronds of Ulva lactuca, the same Myrionema forms small 

 orbicular patches, and is then Kutzing's Myriouema maculiforme. 

 Again when found on the filiform fronds of Ceramia it is reduced 

 to tiny cushion-like patches which constitute the Myrionema 

 punctiforme of Harvey. 



Family— Chordariaceee. 



Tribe l.—LEATHESIEJl. 



ELACHISTA, Duby. 



Elachista fucicola, (Velley,) Fries. 



Fl. Scan., p. 317. — Conferva fucicola. Velley, Mar. Plant., 

 no. 4. 



Descr. Elachista fucicola, Harv., Phyc*. Brit. 



Fig. „ „ Harv., I.e. pi. 240; Farlow, Mar. Alg. New 



Eng., pi. vii., fig. 3. 

 Fxsicc. ,, „ Cmuan, Alg. Finist.. no. 8; Le Jol., Alg. 



Mar. Cherb., no. 89. 

 Conferva fncicola, Wyatt, Alg. Damn., no. 192. 

 Syn. „ „ Ag., Syst., p. 103 ; JoJmttnn, Fl. Berwk. n., 



p. 253. 

 Elachista fucicola, J. Ag., Spec. Alg. i., p. 12. 



Phycophila fucorum, et Phycophila Agardhii, Ktz., Spec. Alg., 

 p. 541 ; Ktz., Phyc. Gen., p. 330 ; Ktz., Tab. Phyc. vin., t. 95, 

 f. 2 ; et t. 96, f. 1. 

 Hah. Common on Fuci along the whole coast. Fruit July and Aug. 



