FROM THE FALKLAND ISLANDS, 177 
Professor W. A. Setchell, who more than anyone else has studied 7ridæa 
in the living state, likewise believes, though he adopts a slightly different 
nomenclature, that most of the so-called species cannot be maintained. He 
kindly examined two of the extreme forms found by Mrs. Vallentin in the 
Falkland Islands, and in a letter concerning them expresses his views as 
follows :— 
* So far as I can make out, the only real peint of difference between 
Tridwa micans and Iridea laminavioides is to be found in the slightly broader 
base of the former, together with its serrulate margin. From my experience 
of this genus on the coast of California, I am not inclined to believe that 
either character is a constant опе. I have watched Jridwa species through 
the year, and found that they vary. I have found a serrulated-margined 
specimen in the midst of a clump with entire margins. I found according to 
the exposure, depth of water, etc., that the texture and shade of colour varied 
so much that all I can do at present is to refer these various species as 
forms, or at most varieties, under Jridwa laminarioides, The one species I 
feel at all certain of being able to distinguish from /ridæa laminarioides is 
1. Augustine. That has a rough surface, but at times it is smooth except 
very near the base..... Consequently my opinion would be that your 
plants are forms or varieties of Iridæa laminarioides, but if you prefer 
that they may be separated from this species, they are to be referred to 
Гава micans." 
Professor Setchell further remarks : ** As you are probably aware, Г am 
inclined to refer even the cordata series to Jridwa laminarioides " ; and in 
his work on the Alge of North-West America he places Z. cordata as 
а form of that species. 
GIGARTINA RADULA, J. Ag. Alg. Liebm. p. 12 ; Sp. ii. p. 278. Iridea 
radula, Bory, Voy. * Coquille,’ р. 107 ; Hook. f. et Нагу. in Fl. Ant. ii. p. 455. 
Falklands ; general, all collectors. 
DISTRIB. Fuegia, Falkland Islands, Kerguelen, Islands off Louis Philippe’s 
Land and Graham Land, New Zealand, Auckland Island, Campbell Island. 
Cape of Good Hope. N. Pacific (Vancouver-California). 
Several portions of very large fronds were brought home by Mrs. Vallentin, 
and also young and entire plants. The majority possess cystocarps in the 
usual apiculate tubercles, but a few fronds contain tetrasporie sori ; and the 
latter are rough with small papille, though the sori themselves are for the 
most part embedded in the substance of the fronds. 
PHYLLOPHORA CUNEIFOLIA, Hook. f. et Harv. in Lond, Journ. Bot. iv. (1845) 
p. 260; Fl. Ant. ii. p. 486. (РІ. 7.) 
E. Falklands; Port William, St. Salvador Bay, Hooker. W. Falklands ; 
West Point Island, Vallentin, Hennis. 
Distrip. Falkland Islands, Kerguelen (?). 
