OSCILLATOHIACEJE. 195 



CUT. LYNGBYA. 



3G5. majuscula {The large Lyngbya) ; tufts of large size ; fila- 

 ments very thick, issuing in long, crisped bundles, from a 

 blackish-green stratum, twisted, simple or Blightly pseudo- 

 branched, Harv. in Hook. Br. Fl. v. 2. p. 370. (Atlas, 

 PL 1AW I. Pig. 358.) 



Lyngbya crispa, Ag. Conferva majuscula, THlho. 



Jl'iij. On mud-covered or Band-covered rock- in the sea, at and 



below half-tide level; thrown up after -tonus, from deep 



water. Annual. Summer and autumn. 

 This is the Largest-growing and strongest species of the 

 genus, and in favourable situations becomes quite a hand- 

 some plant, resembling, in all but colour, fine tufts of curl- 

 ing hair. The plant is well known to British naturalists, 

 and has been found in several localities on our shores ; but 

 on the Continent it appears to have escaped notice. 



3GG. ferruginea (The rusty Lynghya) ; filaments Blender, flaccid, 



forming a long stratum of a rerdigris-green colour, which 



gradually changes to a pale-chestnut, Ag. Syst. Ah/, p, 73. 



(Itlas, PL LXXVIH.Fig. 367.) 



Lyngbya aeruginosa, Ag. L. subsalsa, Carm. Scytonema efFu- 



sum, Carm. 

 JJab. Appin. In small, mud-bottomed pools of brackish water, 

 by the seaside, tilled at Bpring-tides. 

 No one appears to have noticed this plant but the late 

 Captain Carmichael, a fact to be regarded more as a proof 

 of the comparatively little attention which has yet been 

 paid to the Oscillatoriacea, than evidence o\' the rarity of 

 this particular species. How few of the collectors of Bea- 

 weeds trouble themselves with the obscure vegetation of 

 Bait-water mud-bottomed pools near the shore ! — yet such 

 situations, when attentively examined, are found to be 

 rich in microscopic forms, and in species of this curious 



family. I have U0 doubt but that the present species. 



which appears to be not uncommon in Northern Europe, 



may yet be found in many other habitats than the one re- 

 corded above. 



3G7. Carmichaelii (CarfhicKaeT* Lyngbya)] filmier.- 

 long, thiekish, curled and tortuous, cylindrical, formh 

 tensive, grass-green, closely entangled strata ; tube imper- 



■ \ jointed, Harv. in Hook. Br. /•'/. a. 2. p. 371. \ 

 PL L\\\ 111. Kg, 368.) 



Lyngbya crispa, Carm. 



