509 
ters 1 belongs to this species. Batters points out as characteristic 
of the species: »The ultimate branches of two kinds, the one hav¬ 
ing apices drawn out with a long slender point, the other of 
nearly equal diameter throughout, with very obtuse apices«. And 
he continues: »The spiny branches greatly outnumber the blunt 
ones, but both kinds are sometimes found side by side«. But 
these blunt branches are undoubtedly nothing but young branches, 
as the spiny branches when young, have round apical cells. I 
have shown a portion of such a branch in fig. 103 b , and if this 
figure be compared with Batters’s fig. 3, pi. II, the identity appears 
to me unquestionable. It appears to me very doubtful if Acrosi- 
phonia hamulosa is really specifically distinct from this species 
and also from the below-mentioned A. Binderi and A. incurva. 
The species has been found both on open coasts and in shel¬ 
tered localities, it grows near low-water mark on stones and rocks, 
and often covers these with a densely matted growth. It often 
occurs associated with Corallina officinalis, and also epiphytic on 
the latter as well as on Gigaiiina mamillosa and Rhodymenia pal- 
mata. In the smooth bay near Klaksvig, it formed together with 
Acrosiphonia sp. and Chcetomorplia tortnosa large, detached, mat¬ 
ted masses. 
Fruiting specimens were found from April to July. 
Appears to be a common species of the Fseroes: — Yid.: Vider- 
ejde(!); Bordo: Klaksvig (!); Ost.: Glibre (!), Gjov (!) ; Vaago: Midvaag'(!); 
Str.: Sundelaget (!), Vestmanhavn (!), Kvivig (!), Velbestad (!), Gliversnms (!), 
Arge(!), Thorshavn (!); Syd.: Ordevig (!), Sumbo Holm (!), Tvseraa (!). 
186. A. Binderi (Klitz.) Kjellm. 
I have only felt justified in referring one gathering to this spe¬ 
cies. It differs from Kj ell man’s description in having as many 
as 10 fertile cells in a row, but most frequently only 1, 2 or 3 oc¬ 
curred together. The fertile cells are intercalary and have small 
swarmspores, and finely reticular chromatophore; hooked branches 
are absent and spinal branches extremely rare; there are numerous 
rhizoids; the thickest branches are about 60—70 y. I think this 
plant is very closely related to A. albescens. 
Grows on exposed coasts between tide-marks. Fruiting speci¬ 
mens occurred in July. 
Found hitherto only on Syd.: at the foot of Hoddaberg (!). 
1 Batters, E. A. L.: On Acrosiphonia Traillii, a new British alga (Transactions 
and proceedings of the botanical society of Edinburgh, vol XX, p. 213). 
