Marine Algoe of the Dunhar Coast. 295 



merged. Annual. April to October. Fruit in July and August. 

 Sometimes cast ashore in fine specimens, and in considerable abund- 

 ance, by easterly gales in autumn, 



143. Polysiphonia thuyoides, Grev. {Bytiphlcm thuyoides, Harv. in 



Mackay, Fl. Hih.) 



In dark niches in a slaty sandstone reef at half-tide level at the 

 " Vault," Broxmouth; rare. (G. W. T. 1880.) Perennial. Fruit in 

 summer. 



144. Polysiphonia urceolata (Lightf.), Grev. 



On rocks, and epiphytic on Algae, between tide marks, usually 

 in pools; also at a lower level, epiphytic on the stems of Larnin- 

 aria hyperhorea. Usual duration from March to October, but plants 

 sometimes last through the winter. Fruit in July and August. 

 Other host plants: Cladosteplius spongiosus, Cladojpliora uncialis, 

 Corallina oflcinalis. 



BONNEMAISONIA, Ag. 



145. Bonnemaisonia asparagoid.es (Woodw.), Ag. 



Cast ashore from deep water, sometimes in very fine specimens. 

 Annual. June to September. Fruit Lu July and August. 



LATJUENCIA, Lamour. 



146. Laurencia hybrida ^De Cand. ), Lenonn. {Laurcncia cccspifMsa, 



Lamour. ) 

 Common on exposed rocks and in pools at about half-tide level; 

 rarely epiphytic on Algae. All the year. Tetraspores in winter and 

 summer ; ceramidia in July. 



147. Laiirencia pinnatifida (Gmel.), Lamour. 



On exposed rocks at about low-water mark ; and sometimes 

 epiphytic on Algae. In fine specimens. All the year. Tetraspores 

 in winter and spring ; ceramidia in summer. 



DASYA, Ag. 



148. Dasya coccinea (Huds.), Ag. 



Cast ashore from deep water. Epiphytic on Laminaria hyper- 

 horea. Annual April to October. Fruit in July and August. 



Family.— CORALLLN-ACE.F:. 

 MELOBESIA, Lamour. 



149. Melobesia Laminariae, Cm. 



Epiphytic on Laminaria hyperhorea. 



150. Melobesia Lenonnandi, Aresch. 



On shells and stones, but not common. 



151. Melobesia ptistiilata, Lamour. 



Epiphytic on Furcdlaria fastigiaia^ Cliondrus crispus, Himan- 

 thalia lorea, Poly ides rotundus, and Gigaiiina rnamillosa, &c., 

 between tide marks. 



