509 



ters 1 belongs to ihis 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 hlunl 

 ones, but both kinds are sometimes found side by side«. But 

 these hlunt branches are undoubtedly nothing but young branches, 

 as the spiny branches when young, have round apical eells. I 

 have shown a portion of sneli a branch in hg. 103 />, and if this 

 figure he compared with Batters's lig. 3, pi. II, the identity appears 

 to ine unquestionable. It appears lo me very doubtful il" Acrosi- 

 phonia hamulosa is really speciflcally distinct from this species 

 and also from the below-mentioned A. Binderi and .1. 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 olien 

 occurs associaled with Corallina officinalis, and also epiphytic on 

 the latter as well as on Gigarlina mamillosa and Rhodymenia pal- 

 mata. In the smooth bay near Klaksvig, it formed together with 

 Acrosiphonia sp. and Chætomorpha tortuosa large, detached, mat- 

 led masses. 



Fruiting specimens were found from April to July. 



Appears to be a comraon species of the Færoes: — Vid.: Vider- 

 ejde ! ; Bordo: Klaksvig (!); Ost: Glibre (!), Gjov (!); Vaago: Midvaag(!)j 

 Str.: Sundelaget (!), Vestmanhavn (!), Kvivig (!), Velbestad (!), Gliversnæs (!), 

 Arge(!), Thorshavn (!- Sy ti.: Ordevig (!), Sumbo Holm (!), Tværaa (!). 



186. A. Binderi (Kutz.) Kjellm. 



I have only felt justified in referring one gathering to this spe- 

 cies. It dillers from Kjell mans 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 GO— 70 (i. I think this 

 plant is very closely related lo A. albescens. 



Grows on exposed coasts between lide-marks. Fruiting speci- 

 mens occurred in July. 



Found hitherto only on Syd.: at the foot of Hoddaberg (!). 



1 Hat ters, E. A. L.: On Acrosiphonia Traillii, ;i new British alga Transactions 

 and proceedings of the botanical society of Edinburgh, vol XX, p.213 



