380 



they bear other branches and then , with a few rare exceptions, 

 always turn their edges towards the mother plant. 



The top cell is divided by oblique walls as Reinke also points 

 out in his textbook. The tetraspores are elustered and are borne 

 on the lateral branches of the lst and 2nd order, or sometimes 

 first on those of the 3rd order. 



This is a species of the littoral zone and occurs at half-tide 

 level where it grows preferably in rock-crevices and caves, but also 

 on vertical rock faces exposed to the open sea. It can grow in the 



Fig. 57. Callitluimnion scoimlorum Ag. Basal portions of long branches showing rhizoids. 60: 1. 



most exposed piaces, there forming small, low, dense tufts often 

 associated with Isthmoplea sphærophora and Rhodochorton Rothii. 



Tetraspore-bearing piants were found in April, May, June, .lu ly 

 and August, and cystocarpic in June. 



This species is common along the exposed coasts of the Færoes, 

 as already mentioned by Lyngbj'e, 1. c.: -- »ad scopulos maritimos 

 præserlini abruptos insularum Færoensium in summo refluxus limite, 

 copiosissime.« 



It has been gathered ;it the following piaces: — Str. : Kvivig (in 

 caves!), Hojvig (Lyngbye, !), Arge (!), Thorshavn (!) ; Vaago: North 

 side (in caves!), oposite Kvivig (in caves!); Myggenæs: east side (on steep 

 rock faces!); St. Dimon: (on steep rock faces!); San do: Troldhoved (!) 

 Syd.: Trangisvaagfjord (in caves!), Kval bo (Lyngb.), Famien (Lyngb.). 

 Ost.: Næs (Lyngb.). 



