54 Tromsø Museums Aarshefter. 14. 1891. 



119. On Polysiphonia nigrescens. The upright fil am ents 

 55—60 (j. thick, bearing few subsecund, alternating or oppo- 

 site, simple, subereot branches which are a little thinner than 

 their main axis Segments l-l 1 /, times longer than broad. 

 .19. On the stem of L. digitata. The basal disk with 

 some free, mostly short radicles. The uprigkt filaments 35 

 50 [i thick below, 25-30 \x above, segments 1— l 1 /, times 

 longer than broad, seen from the side divided into 2—3 cells 

 equal in hight, bearing some other short or sometimes elon- 

 gated, erect or appressed branch which is slightly thinner 

 than its main axis and almost equal in thickness througout. 

 Propagnla numerous, sometimes terminate, subcylindrical, 

 150-250 jx long, 20 ■ -25 |x thick, with 2 subcylindrical rays 

 130-250 (x long. 



The above mentioned forms nr. 127, 121, 11 and 119 

 I have referred to S. cirrhosa i, nam, but nr. 19 differs so 

 much from the other forms tkat it probably may be referred 

 to another species and, as it coincides well with S. cvspitu- 

 h as to the vegetative part of the plant I previously have 

 referred it to the latter untill the reproductive organs of 

 Lyngbyet original specimen are known. However, the 

 limit between the last mentioned form and the other ones 

 seems to be difficult to draw even as to the outline of the 

 propagula. Cp. H a u c k, Meeresalg. p. 344 and F a r 1 o w, 

 New Engl. Alg. p. 76. S. cirrhosa is a muchvarying plant. 

 It may therefore be that also the named form perhaps is 

 referrible to this spreies. 



Percursaria confervoidea (Lyngb.) nob. 1 



Scytosi phon compressus y confervoideus Lyngb. Hydr. Dan. p. 65. 



K j e 1 1 m an has constituted Diplonema instead of Teiranema Arecsh. 



t 



as a separate genus for the old Conferva (Enter omorpha) percursa. 

 There exist, however, a Diplonema De Notaris [a Chætomorpha]. 

 Op. Reinbold in Schr. naturw. Ver. Schlesw. Holst VIII, p. 125. 

 I therefore adopt Percursaria censtituted by B o r y in Diet. Class. 

 ffktø Råtur. T. IV, p. 393. Cp. L e J o li a Liste Alg. Cherb. p. 55 ? 



BH 



