FROM THE FALKLAND ISLANDS. 163 
CLADOPHORA ARCTA, Kitz. Phye. Gen. p. 263. 
Е. Falklands ; Berkeley Sound, Port William, /Jooker. W. Falklands; 
West Point Island, Vallentin, Hennis. 
Disrris. N. Atlantic, N.W. America, Fuegia, Kerguelen, South Georgia. 
This species, around which in Northern Europe so many varieties and 
subspecies centre, is widely distributed in the subantarctic regions. The 
species was originally described by Dillwyn from Irish specimens, and on 
the Irish coasts numerous forms occur which pass imperceptibly into one 
another. Hence I regard with some misgivings the validity of most of the 
northern species which have recently been proposed, and likewise Kützing's 
C. Hookeriana from the Falkland Islands. Both Hooker’s and Mrs. Val- 
lentin's specimens are somewhat less dense than the commoner British 
forms, but they possess a copious supply of hooked branches and rhizoidal 
filaments. Gain (12, p. 31) gives an interesting note on the structure of 
this species. 
C. PACIFICA, Avitz. Sp. Alg. p. 419. 
Falkland Islands, Hohenacker, no. 266. 
DisrRIB, Auckland Island, Kerguelen, Fuegia. 
See notes by Svedelius, '00, р. 295. 
C. HOOKERIANA, Aüt:. Sp. Alg. p. 418. 
Falkland Islands, Hooker. 
Disrrip. Falkland Islands. 
A form separated from C. arcta by Kützing. Sec note under that species. 
C. conrusa, Hariot, in Bull. Soc. Bot. Fr. xxxviii. (1891) р. 417 (note). 
C. Kuetzingii, Hariot, Miss. Cap Horn, p. 20 (non Ardiss.). 
E. Falklands ; Port Stanley, /7ohenacker. 
DisrriB. Fuegia, Falkland Islands. 
As his earlier name had been previously used by Ardissone, Monsieur 
Hariot re-named this species in 1891. In response to an enquiry he tells 
me that the full synonymy, according to Bornet, is as follows :— С. confusa, 
Hariot; C. Kuetzingü, Hariot (non Ardiss.) ; C. repens, Kütz. in Hohe- 
nacker, no. 411; C. refracta, Kütz. et C. complicata, Kütz., in Hohenacker, 
no. 468; Lycluwte tortuosa, J. Ag. in Hohenacker, no. 253 ; Rhizoclonium 
ambiguum (Hook. f. & Harv.), Kütz. Sp. Alg. p. 387. 
With regard to the last name given as a synonym, if this were correct a 
further change in nomenclature would have to be made, as Hooker & Harvey’s 
name antedates all others. An examination of the type shows, however, that 
that plant is а true Rhizoclonium and not a Cladophora, hence it is not a 
synonym of Hariot's C. confusa. 
