400 
Order CORALLINACEAE. 
PHYMATOLITHON 1 Fosl. 
71. Ph. polymorphum (L.) Fosl. 
As in the Arctic Sea, according to Kjellman (N. I., p. 135 [102]) 
so also in the Faeroes this species grows in the littoral zone, where 
it occurs abundantly; but it is also met with in the sublittoral zone 
down to a depth of 10 fathoms. Its proper habitat is near low- 
water mark or strictly speaking on either side of low-water mark, 
where it occurs especially on smooth, vertical rock-faces as a thick 
crust, varying in colour from white to pink and forming a belt 
often several feet in breadth. It grows most luxuriantly in the 
interior of caves and occurs here from a height of several feet 
above sea-level downwards into the water as far as the eye can 
see. According to my observations this species extends farthest into 
the caves, up to the point where they become too dark even for it. 
According to what Mr. Foslie writes to me it bore sporangia 
in May, July and December. 
This species is extremely common along the Faeroese coasts. 
72. Ph. laevigatum Fosl. 
Found in the sublittoral zone down to a depth of 10 fathoms 
on stones and shells. It has been observed both in sheltered loca¬ 
lities and in the open sea. 
According to Mr. Foslie it bore sporangia in July, October and 
November. 
Vid.: Kvannesund (H. J.); Bordo: Haraldsund (!); Kuno (H. J.); 
Ost.: Glibre (H. J.); Str.: Arge (!), Sundene between Thorsvig and Kval- 
vig (!); Syd.: Vaagfjord (H. J.). 
CLATHROMORPHUM Fosl. 
73. Cl. circumscriptum (Stromf.) Fosl. 
Bore young sporangia in June. 
Found once only on Str.: in Sundene between Thorsvig and Kvalvig (!). 
LITHOTHAMNION Phil. 
74. L. glaciale Kjellm. 
According to Mr. Foslie all the specimens are young and partly 
stunted hence the determination is open to doubt. 
1 Mr. M. Foslie of Trondhjem has kindly determined this genus and the 
ollowing: — Clathromorphum, Lithothamnion, Lithophyllum and Dermatolithon. 
