Marine Algce of the Orkney Islands. 315 



Family.— ASPEROCOCCACEiE. 



ASPEROCOCCUS, Lamoui. 



85. Asperococcus bullosas, Lamour. {A. Tiimeri, Hook.) 



On stones, and epiphytic on the larger Algae. Often growing in 

 4 or 5 fathoms. Annual. Summer and autumn. Howan Sound ; 

 Linga Sound, common ; Kirkwall Bay, fine. 



86. Asperococcus compressus, GrifF. 



On coral and stony bottoms, Calf Sound. Annual. Summer. 



87. Asperococcus echinatus (Ag.), Grev. 



Common in shallow pools from near high-water mark to about 

 half-tide level. Always submerged. Often epiphytic on Alga?.. 

 Annual. April to October, Sporangia in summer. The variety 

 rermicularis, Harv., occurs, amongst other places, in pools near 

 high-water mark at the west side of Scapa Bay. 



Family. —LAMI NARIACE^. 



CHORDA, Stackh. 



88. Chorda filum (Linn.), Stackh. 



Common, chiefly in sandy bays, from a little above low-water 

 mark to 4 or 5 fathoms. Annual. April to December. Fruit in 

 Jidy and August. Natural place of growth a little outside of the 

 Laminarian belt. 



89. Chorda tomentosa, Lyngb. {Chorda filum, var. /3 tomcntosa, Harv.) 



On submerged rocks beyond low-water mark. Annual. Skaill 

 Bay, West Mainland ; Kirkwall Bay. 



ALARIA, Grev. 



90. Alaria esculenta (Linn. ), Grev. 



Common at exposed places at about low-water mark. Always 

 submerged. Perennial. Fruit in Avinter. Called " Mi(rJi7is " in 

 Orkney. 



SACCORHIZA, De la Pylaie. 



91. Saccorhiza (Laminaria) b\ilbosa (Huds.), De la Pylaie. 



in deep water. I'erennial. Fruit in autumn. Large, just 

 within the eddy of strong tides. Very large specimens in 4 fathoms, 

 Calf Sound, just within the eddy of a very strong tide, on a stony 

 bottom. 



LAMINARIA, Lamour. 



92. Laminaria digitata (Linn.), Edni. 



On rocks at about low-water mark. Perennial. Fruit in winter. 

 The variety stenophylla, Harv., also occurs. 



