192 BYNOP8I8 OF BRITISH BEAWE] 



equally covered are they. Under water they reflect 

 tints. 



357. mucor (The mouldy Calothrix), Ag., Hook. Brit. 7*7. v. 2. 

 p. 367. 



Hab. ? 



This Bpecies, described by Agardh, and cited in the 



' British Flora,' is unknown to me. 



358. luteola (The yellow-tinged Calothrix) ; filaments scattered, 

 exceedingly minute and Blender, filiform, flexible, obt 

 hyaline and pale-yellowish, or containing an opaque, light- 

 green, interrupted, faintly simulated endochrome, Grev. 



.,'. Fl. t. 299. (Atlas, PI. LXXVII. Fig. 361.) 

 Calothrix melaleuea, Carm. Leibleinia luteola, Ktz. 

 Hab. Appin. On marine, filiform Alga', in tide-pools. 



I have only seen this plant in a dried state, when its 

 colour may have altered. Under the higher powers of the 

 microscope the green endochrome (of the dried specimen) 

 is very obvious ; the "yellow and hyaline" character men- 

 tioned by Greville, has reference to the empty tube, from 

 which the colouring matter has been discharged. I have 

 only seen Carmichael's specimen, but as he found it 

 abundantly at Appin, it is probably still to be met with on 

 that coast, and is worth looking after. 



359. scopulorum (The rock Calothrix); stratum velvety, dirty- 

 green, of indefinite extent ; the filaments flexuous, subulate 

 and sub-attenuated, simple, Agardh, Syst. p. 70. (Atlas, 

 PI. LXXVII. Fig. 363.) 



Oscillatoria scopulormn, Ag. Conferva scopulorum, Web. et 



Mohr. 

 Hah. On marine rocks, near high-water mark. Common. 



This forms slimy patches, very treacherous to unwary 

 feet, on the surface of rocks near high-water mark, often 

 growing in places where it is only wet by the splashing of 

 the sea, or only covered at spring-tides, and where it is 

 much within the influence of rain. It is found on all our 

 shores, on rocks of every geological character indifferently. 

 and is probably to be met with in similar situations all 

 over the world. 



360. fasciculata (Thr fascicled Calothrix); stratum velvety, 

 dark-green, of indefinite extent; filaments aight, 

 subulate, much attenuated, fasciculately pseudo-branc 

 Ag. Syst. p. 71. (Atlas, PL LXXVII. Fig. 362.) 



