Marine Algce of the Orkney Islands. 311 



57. Stilophora Lyngbyaei, J. Ag. 



In land-locked bays and estuaries, on a muddy and sandy bottom, 

 in from 4 to 10 fathoms. Annual. Summer. KirkwaU Bay, fine. 



Family.— CUTLERIACEtE. 



CUTLERIA, Grev. 



58. Cutleria multifida {Fng. Hot. ), Grev. 



In still water — Howan Sound and Kii'kwall Bay; epiphytic on 

 Laminaria hyperhorea. Annual. Summer and autumn. 



j\[r Pollexfen tells me that a specimen of this seaweed, which he 

 dredged in Kirkwall Bay more than fifty years ago, was the first on 

 which Dr Greville e^-er saw the anther-like fruit described some 

 years afterwards by Dr Dickie of Aberdeen ; that in the following 

 year he dredged other specimens in the same locality, which differed 

 very much in appearance and had the more common fructification ; 

 that they are extremely narrow, and so regularly dichotomous, that 

 he placed them for some time in his herbarium under the MS. 

 name C. dichotoma ; that latterly he regarded them merely as a 

 very narrow variety of C. multifida ; and that they are so narrow 

 as to be easily mistaken at first sight for Stilophora Lyngbi/m, 

 which is by no means uncommon in the same place. Mr Batters, 

 who has examined the .specimens, confirms the accuracy of Mr 

 Pollexfen's nomenclature. 



Family.— ECTOCAEPACE.E. 



MYRIOTRICHIA, Harv. 



59. Myriotrichia clavaeformis, Harv. 



In pools from near high-water mark to about half-tide level ; 

 epiphytic on Algcfi. Annual. Spring and summer. Occurs at the 

 west side of Broch in Rousay epiphytic on Asperococcus ecliinatu^. 



60. Myriotrichia clavseformis, var. ^^Z{/(>7-?nis (Harv.), Farlow. 

 Associated with the preceding. Annual. Spring and summer. 



61. Ectocarpus confervoides (Roth), Le Jolis. {Edocmyus silicidoms, 



Lyngb. ) 



Epiphytic on Algae in pools between tide marks. Always sub- 

 merged. Annual. ^lay to September. Fruit in June and July. 



62. Ectocarpus tomentosus (Huds.), Lyngb. 



Common on fuci between tide marks. Usually in places left un- 

 covered by the tide, and exposed to the light for some hours daily. 

 Annual. April to September. Fruit in summer. 



63. Ectocarpus fasciculatus, Harv. 



Epiphytic on Laminaria mccharina and CJiorda fihim ; also on 

 rocks in pools near low-water mark. Always submerged. Annual. 

 April to October. Fruit from ]\Iay to September. "Whalgjio, 

 "Westray ; Skaill, West Mainland ; Kirkwall Bay, &c. 



