STIGONEMA. 229 



third of the branches- are frequently of a vivid green colour. 

 It is just probable that this species is but a condition of the 

 previous one, the differences observed being occasioned by its 

 moister habitat. 



3. STIGONEMA PANNIFORME Harv. 



Plate LXVI. Figs. 4, 5. 



Char. Filaments dark brown, densely packed together, much 

 branched. Branches long, Jlexuous, obtuse. Cells an- 

 gular, in triple series. 



Scytonema panniforme Carm. MS. ; Ag. Syst. p. 309 ? 

 Stigonema panniforme Harv. in Manual, p. 154. 



Hob. On rocks at the mouth of Spar Cave : Capt. Car- 

 michael. 



" Patches indeterminate, crust-like, velvety. Filaments so 

 closely packed that only their tops are visible above the crust, 

 very tough when dry, gelatinous when moist, cohering 

 strongly together, much branched ; branches long and flexuous, 

 divaricating, cylindrical, quite obtuse, not tapered. Granules 

 ternate, very obvious in all the main branches, less distinct 

 towards the tips. This entirely agrees in external character 

 and ramification with the Scytonema panniforme of Agardh, 

 with an authentic specimen of which I have compared Car- 

 michael's specimen. The only difference I can perceive lies in 

 the generic character, and this I suspect depends on age, for 

 I find the apices of the branches simply striated, like a Cal- 

 othrix or Scytonema, and the smaller branches, for, at least, 

 part of their length, have the semi-punctate appearance of S. 

 ocellatum ; and it is only in their larger and main branches 

 that the punctated character is clearly visible." Harv. 



4. STIGONEMA INTERRITPTUM Hass. 



Plate LXIX. Fig. 2. 



Char. Filaments thick, subulate, coriaceous, glaucous green, 



Q. 3 



