417 



here I may remark that I have searched in vain for this alga on 

 two original specimens gathered by Simmons near Kvalbo on 

 which only Elachista scutulata occurred. 



95. E. Stilophoræ Crouan, Florule du Finistére, Paris 1867. 



var. cæspitosa Rosenv., Gronl. Havalg., p. 892. x 



The description given by the brothers Crouan, 1. c, is very 



short, so that it is difficult to base a reliable determination on it, 



but as the Færoese specimens gathered by me are undoubtedly 



identical with the plant figured by Rosen vinge (I. c. lig. 26, A), I 



Fig. 75. Ectocarpus Stilophoræ Crouan. var. cæspitosa Rosenv. a part of a plant with pluri- 

 locular sporangia; b part of a plant with unilocular sporangia ; c the basal threads. 400: 1. 



report it here under this name. The plant, of which I have shown 

 some fragments in fig. 75, was found growing in the sorus of a 

 Laminaria; the plurilocular sporangia often occur several on each 

 branch and attain to a thickness of about 5 — 6 n, and, as far as I 

 could see, it bore also unilocular sporangia (see fig. 75, b), the latter 

 being cylindrical or somewhat swollen in the middle and attaining 

 to a length of some 20 — 25 n and to a breadth of some 5 \i. The 

 erect filaments occur abundantly in small patches, as pointed out 

 by Rosenvinge. 



Specimens bearing both unilocular and plurilocular sporangia 

 were met with in July. 



Found hitherto only on Str. : Thorshavn (!). 



1 Cfr. Svedelius, »Studier ofver Ostersjons Hafsalgflora«, Upsala 1901, p. 105. 



