280 Mr George Traill on the 



Family.— DESMARESTIACE^. 

 DESMARESTIA, Laiuour. 



35. Desmarestia acvileata (Liun.), Lamour. 



On stone and rocks from a little below the low-water mark of 

 spring tides to deep water. Perennial. 



36. Desraarestia viridis {Fl. Dan.), Lamour. 



On stone and rocks from a little below tlie low-water mark of 

 spring tides to deep water. Perennial. Usually associated with 

 the preceding. 



Family.— DICTYOSIPHONACExE. 

 DICTYOSIPHON, Grev. 



37. Dictyosiphon foeniculaceus (Huds. ), Grev. 



Common in pools at about half-tide level. Epiphytic on Scytosiplion 

 lomentarms, Chondrus cHsjnis, Phyllit is fascia, Gujartina mamillosa, 

 Cladnphora rupestris, and other Algre. Always submerged. Annual. 

 April to October. Spores escape in July and August. The variety 

 Idspidus of Kjellman also occurs. 



38. Dictyosiphon hippuroides (Lyngb.), Kiitz. 



In pools from about half-tide level to low-water mark. Nearly 

 always epiphytic on Chordaria Jiarjelliformis. Annual. May to 

 November. Spores escape in July and August. Common, and 

 often of large size, especially at the "Vault," where I obtained the 

 first known Britisli plants in 1880. 



39. Dictyosiphon mesogloia, Ag. 



In shallow pools, usually a little below the high-water mark of 

 neap tides. Annual. May to September. In fruit usually during 

 July and August, when the spores are enveloped until maturity in 

 gelatinous globules attached to the exterior of the fronds. Common, 

 especially in pools below the cliffs west of Dunbar; often in fine 

 specimens. (G. W. T. 1881.) 



STICTYOSIPHON, Kiitz. 



40. Stictyosiphon tortilis (Rupr.), Rke. 



Usually in pools at about half-tide level. Always submerged. 

 Never epiphytic on Algae. Annual. Usual duration from about 

 the beginning of March to September. Fruit in July and August. 

 In muddy pools at the ladies' bathing pool west of the castle. 

 (G. W. T. 1890.) 



Family.— ECTOCARPACE^. 

 MYRIOTRICHIA, Harv. 



41. Myriotrichia clavaeforniis, Harv. 



Epiphytic on Asperonocc.us echinatus, Cladopliora rupestris, 

 Dictyosiphon hippuroides, and Scytosiphon lomentarius, &c., in pools 



