Marine Algce of the Orhney Islands. 327 



171. Chylocladia clavellosa (Tmn.), Grev. {Chrysymenia clavcllosa, 



J. Ag.) 



Growing at the low-water mark of tho lowest tides oa rocks and 

 stones ; also epiphytic on Algae. Always submerged. Annual. 

 April to October. Fruit in July and August. Fine and common 

 at many localities. 



172. Chylocladia rosea, Harv. {Chrysymenia rosea, var. Orcadensis, 



Harv.) 



Originally discovered in Orkney by Miss "Watt at Skaill on 

 Laminaria hyperborea. Sunda Firth, 8 fathoms (M'Bain). 



CHAMPIA, Harv. 



173. Champia parvula ( Ag. ), Harv. {Chylocladia parvula, Hook.) 

 Epiphytic on the smaller Algae in pools near low-water mark. 



There is an Orkney specimen in the late Mrs Clarke's collection, 

 but the particular locality is unknown. 



RHODYMENIA, Grev. 



174. Rhodymenia palmata (Linn.), Grev. 



Common ou exposed rocks and in pools between tide marks ; 

 also epiphytic on Algae. Biennial. Granules, January, February ; 

 tetraspores, August ; tubercles, June, July, August. The narrow- 

 form (var. soholifera, Grev.) is very fine and extremely abundant 

 at Kirkwall Bay between tide marks, especially at the Ayre and 

 at "Weyland. 



175. Rhodymenia Palmetta (Esper), Grev. 



Usually on rocks near the limit of low-water mark, and at a 

 greater depth ; also epiphytic on the stems of Laminaria liyperhorea. 

 Annual. Summer and autuinn. At Kirkwall Bay (Polloxfen) ; 

 as identified by Greville, and more recently by Batters. 



PLOCAMIUM, Lamour. 



176. Plocamium coccineum (Huds.), Lyngb. 



On rocks, and sometimes epiphytic on Algae, in deep water. 

 Perennial. Fruit in summer. Common, and often very fine. 



CAIiLIBLEPHARIS, Kiitz. 



177. Calliblepharis ciliata (Linn.), Kdtz. {Rhodynunia ciliata, Grev.) 

 At Widefirth as identified by Harvey. Annual. Fruit in 



winter. 



178. Calliblepliaris jubata (Good, and Wood.), Kiitz. {Rhodymenia 



juhata, Grev.) 



Shapansey ; Carness ; Kirkwall Bay, opposite Crossiecrown, 5| 

 fathoms, July 1887, extremely narrow form ; identified by Kjell- 

 man. Annual. Fruit in summer. 



