342 Marine Alycu of Berwick- on-Tiveed. 



NlTOPHYLLUM BONNEMAISONI, Grev. 



Alg. Brit., p. 81. 

 Descr. Nitophyllum Bonnemaisoni, Harv., Phyc. Brit. 

 Fig. „ „ Hare, I.e. pi. 23. 



Exsicc. „ ,, Crouan, Alg-. Finist., no. 255. 



Syn. ,, ,, J. Ag., Spec. Alg. n., p. 665 ; Id., 



Epicr., p. 4-52. 

 Delesseria Bonnemaisoni, Ag., Sp. Alg. I., p. 186 ; Ay., Syst., p. 



252 ; Grev., Sc. Crypt. FL, t. 322 (excl. figs. 3 et 8). 

 Aglaiophyllum Bonnemaisoni, EndL, 3rd. Suppl., p. 52. 

 Cryptopleura Bonnemaisoni, Ktz., Spec. Alg., p. 871 ; Id., Tab. 

 Phyc. xvi., t. 28. 

 Hab. Cast ashore from deep-water, usually on the stems of Laminuria 

 hyperborea. Rare. Berwick Bay, Holy Island. 



F. URASSINERVA, Nob. 



var. stipite brevi, in costam supra sensiui evanescentem 

 abeunte, fronde subintegra vel iiabelliforniiter dichotoma, 

 segoieutis paucis, angustis. Tab. Nostr. xr., fig. 12. 

 Hub. On the stems of Laminaria hyperborea. July and Aug. Berwick 



Bay. Rare. 



In this curious variety the short stem, instead of passing 



gradually into the lamina, seems to be continued upwards, 



forming a very evident nerve in the centre of each segment . The 



tetraspores are usually collected near the apices of the segments. 



Nitophyllum Hillle, Grev., Alg. Brit., p. 80. 

 Descr. Nitophyllum Hilliae, Harv , Phyc. Brit. 

 Fig. ,, ,, Harv., I.e. pi. 169. 



Exsicc. ,, ,, Crouan, Alg. Finist., no. 256 ; Le Jol., Alg. 



Mar. Cherb., 215. 

 Nitophyllum ulvoideum, Wyatt, Alg. Danm., no. 16. 

 Syn. „ „ Hook., Br. Fl. n., p. 287. 



Nitophyllum Hillias, /. Ag., Spec. Alg. II., p. 667 ; Id., Epicr., p. 



453. 

 Cryptopleura Hillise, Ktz., Spec. Alg., p. 871. 

 AgJaophyllum Hillise, EndL, 3rd Suppl., p. 52. 

 What appears to be a variety of this species is occasionally 

 washed ashore at Berwick during the summer months. 



The fronds are much thicker than those of any other of our 

 native Nitoplryila, deeply and irregularly divided, the segments 

 broad, with very obtuse apices. All my Berwick specimens bear 

 cystocarps or are perforated with small round holes caused by 

 the mature spores having escaped from the frond. 



