Marine Algce of the Orkney Islands. 329 



September. Fruit in July and August. Common, and often very 

 line. Epiphytic on Laminaria Ityptrhorea near Broch in Kousay, 

 very fine, found by the late Mrs Traill of Woodwick in 1839 ; 

 Scapa Bay, fair ; Carness ; Skaill, AVest Mainland, &c. The variety 

 y has been found at Skaill, West ^Mainland ; extremely fine at 

 Broch in Rousay, by Mrs Traill, sometimes epiphytic on old fronds 

 of Desmarestia acideata ; and also in Kirkwall Bay. The variety 8 

 seems to be confined to Orkney. Harvey had never seen it till he 

 examined Mr Pollexfen's collection. Mr PoUexfen tells me that 

 he dredged it originally in Kirkwall Bay, and that, so far as he 

 knows, it has not been found elsewhere except in Rousay. Some 

 of the specimens are covered with antheridia, by far the rarest of 

 the organs of fructification of the KitopJujUa. Mr Pollexfen writes 

 to me : — " Crouan has found in France a species of Nituphyllum to 

 which he gave the specific name Alliaceum. This, J. Agardh makes 

 a variety of N. pundatum, to which he gives Crouan's specific 

 name ; and as a synonym he adds the var. Polhxfenii of Harvey. 

 He (J. Agardh) states, on the authority of Crouan, that a recently 

 gathered specimen when plunged in fresh water emits the odour of 

 garlic. I have no recollection of my plants giving out this smell ; 

 though I think I should have noticed it, as in those days I paid 

 much attention to the different odours of Algae, and was able to 

 tell by the smell alone, before seeing them, the names of most of 

 the species of seaweeds collected by a friend and put into a 

 handkerchief. It is very desirable that collectors in Orkney, who 

 are fortunate enough to find the variety 8 of N. jjunctatum, should 

 ascertain whether, when put in fresh water, it has any smell of 

 garlic." 



186. Nitophylliun Bonnemaisoni, Grev. 



Epiphytic on Laminaria hyperhorea. Annual. Summer. Cast 

 ashore south of Stromness, at Hoy Sound (J. W. Gray). Mr 

 Pollexfen has found this plant at Skaill, West Mainland, and very 

 fine at Papa-Westray. He tells me that he has found it at ditierent 

 places on the west coast, but very rarely on the east. 



187. Nitophyllaim Hilliee, Grev. 



On the shaded sides of deep pools near low-water mark, and at a 

 greater depth. Annual. Summer and autumn. Occurs at Skaill 

 Bay, West Mainland, according to Mr Pollexfen. 



DELESSERIA, Grev. 



188. Delesseria alata (Huds.), Lamour. 



On rocks, and epiphytic on Algf?, at and below low-water mark. 

 All the year. Fruit, ]\Iarch to ^lay. Common, and often very 

 tine. 



189. Delesseria angustissima, Griff. 



Shapansey, fine ; Holm, Deerness (J. Cursiter); Inganess Bay (J. 

 H. Pollexfen); Linga Sound, rare (M'Bain); Sanday (Rev. Gilbert 

 Laing). 



