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 clustered and are borne 
on the lateral branches of the 1st 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 
most exposed places, there forming small, low, dense tufts often 
associated with Isthmoplea sphcerophora and Rhodochorton Rothii. 
Tetraspore-bearing plants were found in April, May, June, July 
and August, and cystocarpic in June. 
This species is common along the exposed coasts of the Fseroes, 
as already mentioned by Lyngbye, 1. c.: — »ad scopulos maritimos 
prsesertim abruptos insularum Fseroensium in summo refluxus limite, 
copiosissime.« 
It has been gathered at the following places: — Str.: Kvivig (in 
caves!), Hojvig (Lyngbye,!), Arge (!), Thorshavn (!); Vaago: North 
side (in caves!), oposite Kvivig (in caves!); Myggenses: east side (on steep 
rock faces!); St. Dimon: (on steep rock faces!); Sand6: Troldhoved(!) 
Syd.: Trangisvaagfjord (in caves!), Kvalbo (Lyngb.), Famien (Lyngb.). 
Ost.: Nses (Lyngb.). 
