Prof. Balfour on the Flora of the Cumbrae Islands. 71 



ever, is the Roccella tinctoria, now for the first time ascertained to 

 be a native of Scotland ; the most northern locaUties previously 

 known for it being the maritime rocks along the south coast of 

 England, and the Guernsey, Portland, and Scilly islands. The 

 specimens found on the Cumbraes, where I believe it occurs in pretty 

 considerable abundance, are somewhat slender and diminutive, but 

 remarkably characteristic. The west coast of Scotland, and especially 

 the smaller islands, have been very little visited and explored by the 

 botanist ; and hence it is that we have remained so long ignorant of 

 the existence of this very interesting addition to the Flora Scotica. 

 I have no hesitation in saying, that, were a sufficiently careful and 

 diHgent search once instituted along the other smaller and less-knowa 

 islands on the same coast, we should be able to record more than one 

 locality in Scotland for the Roccella tinctoria. I may add, in con- 

 clusion, that the nomenclature of these Lichens is that of Hooker's 

 English Flora. I have adopted it in preference to that of other 

 authors, whose works are now slowly finding their way among us— 

 not because it is the best, but because it can be more easily consulted.** 

 The following list of Marine Algae found on the coast of the Cum- 

 braes was prepared by Mr. R. Kennedy : — 



Halidrys siliquosa. 

 Fueus vesiculosus and 



var. balticus. 



ceranoides. 



serratus, 



nodosus. 



canaliculatus. 



Himanthalia lorea. 

 Desmarestia aculeata. 



viridis. 



Alaria esculenta. 

 Lamiiiaria digitata. 



• bulbosa. 



— - — saccharina. 



phyllitis. 



fascia. 



Chorda Filum. 



■ lomentaria. 



Zonaria parviila. 

 Dictyota dichotoma and 



var. intricata. 

 Stilophora rhizodes. 



Lyngbyii. 



Dictyosiphon foenicu- 



laceus. 

 Striaria- attenuata. 



fragilis. 



Punctaria latifolia. 



plantaginea. 



tenuissima. 



Asperoeoceus Turneri. 



echinatus. 



Litosiption pusillus. 

 Laminarise. 



Chordariaflagelliformis. Odonthalia dentata. 

 Mesogloia vermicularis. Rhodomela lycopodi- 



virescens. 



Leathesia tuberiformis. 

 Ralfsia verrucosa. 

 Elachistea fucieola. 



stellulata. 



Myrionema strangularis, 



Leclancherii. 



punctiformis. 



Cladostephus verticil- 



latus. 



spongiosus. 



Sphacelaria scoparia. 



plumosa. 



cirrhosa. 



— radians. 



racemosa. 



Ectoearpus siliculosus. 



Hincksise. 



fascieulatus (var. 



tessellatus). 



tomentosus. 



crinitus. 



distortus. 



Landsburgii. 



littoralis. 



granulosus. 



sphajrophorus. 



branchiatus. 



Mertensii. 



Myriotrichia clavaefor- 



mis. 

 — — filiformis. 



oides. 



subfusea. 



Polysiphonia urceolata. 



formosa. 



fibrata. 



elongella. 



elongata. 



fibrillosa. 



Brodiaei. 



nigrescens. 



• atrorubescens. 



fastigiata. 



parasitica. 



byssoides. 



Dasya coccinea. 

 Bonnemaisonia aspara- 



goides. 

 Laurencia pinnatifida. 



csespitosa. 



dasyphylla. 



Chrysymenia clavellosa. 

 Chylocladia kaliformis. 



r parvula. 



articulata. 



Corallina officinalis. 

 Jania rubeus. 

 Melobesia polymorpha. 



fasciculata. 



membranacea. 



verrucata. 



• pustulata. 



Hildenbrandtia rubra. 



