LT0B1 L( ! E. 





If<ii>. Spreading oyer the Burface of marine rocks, about half- 

 tide level; probably common. Annual? Found at ail 

 jons. 



Tins [fl nearly related to C. scopulorum^ and I am by no 



means Bure tliat it sli« >ul«l not he considered as merely a 

 more developed form <>f thai plant, the differences 

 occasioned by it> gro^i big at a greater depth, and in places 

 where it is more constantly submerged. The filaments 

 are taller, straighter, more acuminate, and <»f' a deeper 

 green than in C. scopulorum, and very frequently are 

 furnished with tufts of accessory branches, but this is a 

 character of minor Importance. 



361. pannosa {The incrusting Calothrix); filaments el 

 rigid, very much curled and twisted, obtuse, densely inter- 

 woven together into lamellated tufts or hone} -combed s1 

 endochrome blackish-green, densely annulated, Ag. i\ 



X It. v. 1<>. p. (;: , ».">. no. \-l. (Atlas, PL LWVI. Fig. 3* 

 Hob. Near high- water mark, growing either <>>i rocks, on 



canaliculatus, or on Corallina officinalis, etc Perennial. 

 This species obviously differs in many characters, 

 any British species, but I am not prepared to say that it 

 - \\ i 1 1 1 Agardh's plant gathered at Trieste. Of the 

 latter T have seen no specimen, and form my judgment 

 merely <>n the short description given by Agardh in the 

 f Botanische Zeitung,' which completely answers to onr 

 plant. A comparison with authentic specimens would be 

 very desirable. 



362. semiplena {The variegated Calothrix); filaments long, 

 -lender, tough, flexuous, densely interwoven into Lamellated 

 tufts : endochrome glaucous-green, frequently interrupted, 

 leaving parts of the tube empty, -/'/. Bot. Z> it. 1827, 

 (Aha-. PI. LXXVn. Fig. 



Lyngbya semiplena, ./. Ag. L. Lutescens, TAeb. Leibleinia 



plena, Kh 

 Hob. In rock-pools near high-water mark, growing i i I 



officinalis and other Bmall Alga?. 



i indebted to my friend Mr. Thwaites, for sug 



im; that a plant which I observed at k'ilkee. in 1842, 



had communicated to Borne friends, with the manuscript 

 name ('. lamellata, might be the C. semij gardh, 



and, though I have seen no authentic specimen, I have 

 little doubt that this is so. At least, the specimen in my 

 P Aresch Scandinavicse,' w hi< h i- quoted 



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