44 M. FOSLIE. [1905 



up by excavators, comm. No rum!); Ostensjo in Hardanger (No- 

 rum!) 1 ); at Mandal (Wille!,!), Langesundsfjord ! 



11. LitJiotJiamnion TJngeri Kjellm. 



N. Ish. Algfl. (1883) p. 120! Non L. byssoides Unger. 



f. typica. 



Lithothamnion fruticulosum f. t} 7 pica Fosl. Norw. Lithoth. (1895), p. 18, pi. 

 3 et 4, fig. 1 — 2, non Kiitz; Lithothamnion Ungeri f. t}-pica Fosl. Rev. Syst. Surv. 

 Melob. (1900), p. 11. 



Frond freely developed at the bottom, very seldom attached, 

 repeatedly branching from the centre, branches erecto-patent, short, 

 curved, feebly attenuating or not so, with ends rounded or some- 

 times spherically thickened, fastigiate or subfastigiate, 1,5 — 2 mm. 

 thick, often provided with wartlike processes or short side-branches, 

 finally rather crowded and coalescing; conceptacles of sporangia 

 frequently crowded in the upper part of the branches, subpromi- 

 nent, 300—400 or up to 500 /j. in diameter; sporangia tetrasporic, 

 100 — 150 by 35 — 50 fi, conceptacles of cystocarps conical, of about 

 the same diameter as those of sporangia. 



f. flexuosa Fosl. 



Lithothamnion fruticulosum f. flexuosa Fosl. Norw. Lithoth. 1. c, pi. 6 — 8; 

 Lithothamnion Ungeri f. flexuosa Fosl. Rev. Syst. Surv. Melob. p. 11. 



Branches usually less crowded than in the typical form, up 

 to 2,5 mm. thick. 



Syn: Lithothamnion Ungeri Fosl. Contrib. I (1891'), p. 8; Jonss. Mar. Alg. 

 Icel. I (1901), p. 153; De Toni, Syll. Alg. IV (1905), p. 1734, partim. 



As I observed above, in treating of L. intermedium, I take 

 L. TJngeri a little otherwise circumscribed than I formerly did. 

 Kjellm an 1. c. states that „it differs distinctly (from L. soriferum) 

 by its strongly developed, crustaceous hypothallus, by its denser 

 ramification, with shorter, much finer, and less compound branches". 

 In Norw. Lithoth. 1. c. I admitted the species in the same sense. 

 But 1 have afterwards made sure that, strictly speaking, it never 



*) The specimen from this place is inverted cup-shaped, with the upper 



branches rather coalescing, and in habit almost coinciding with L. forni- 



catum f. obcrateriformis. I have not found sporangia, and the deter- 

 mination is not certain. 



