496 Howe: PHYCOLOGICAL STUDIES 
larger and of irregular outline, mostly subquadrate, subquadrate- 
oblong or cyathiform in lateral view, less commonly cornucopiae- 
form, 65-150 » long (including the usually slender stalk), truncate 
at apex, in firm contact above with those adjacent for 4-2 their 
length, often interlocked, separable with much difficulty on decal- 
cification : utricles of the subcortical layer in a single series, bullate, 
varying from broadly funnelform to subglobose or ellipsoidal, 
mostly ventricose-obovoid, 110-215 # in maximum width, always 
much larger than the peripheral utricles, 4-14 of which commonly 
arise from the subtruncate apex of each: filaments of the central 
strand fusing in twos or rarely in threes at the nodes, not coherent, 
the fusion often incomplete: sporangia unknown. [PLATE 25, 
FIGURES 11-20; PLATE 26. | 
Type Locatity: Unknown (“Kamtschatka, Voyage de la 
Vénus,” according to presumably erroneous label); type speci- 
men in the herbarium of the Muséum d’Histoire Naturelle in Paris. 
DistrrisuTion: Southern Florida and the West Indies; 
Hawaii; Celebes; Red Sea; probably of general distribution in 
the tropical seas. 
In giving the distribution of the species as above, we are 
guided only by specimens now in the herbarium of. the New 
York Botanical Garden. Both Halimeda discoidea and H. Tuna 
occur in Oahu, Hawaiian Islands. We have specimens of Hali- 
meda Tuna also from the Philippines, Singapore, and from some of 
the East Indian islands visited by the Siboga Expedition, and it 
seems probable that both H. Zuna and HW. discoidea have a wide 
distribution in the tropical parts of the Indian and Pacific oceans, 
as well as of the Atlantic. Askenasy’s figure x1 (Forschungs- 
reise S.M.S. Gazelle 4: /. 7) was very certainly drawn from a 
specimen of H. discoidea, apparently from Dirk Hartog Island, 
Western Australia, though it was identified by Askenasy with the 
quite different 7. macroloba Decaisne. The specimen of H. dis- 
coidea from the Red Sea, which we have cited above, was collected 
by Boissier in 1855 (xo. 5) and was distributed as H. macroloba. 
This specimen resembles very closely Zanardini’s figure of his 
Halimeda papyracea, the type * of which also came from the Red 
Sea. The specimen from the Celebes which we have cited was 
*We have been unable to locate the type specimen of Zanardini’s Halimeds papy- 
acer, WhICh does not appear to exist in his herbarium now preserved in Venice. 
Mrs. Gepp, in her monograph of the genus Halimeda (p. 15), mentions that she had 
been allowed to see this type specimen ‘through the kindness of Dr. Reccari.”” Dr 
