No. 3] REMARKS ON NORTHERN LITHOTHAMNIA. 117 



Area: Norway: Kiberg near Vardo (!), Syltefjord (!), the 

 North Cape (!), the Trondhjem Fjord (!), and from Froien as far as 

 Haugesund (!), Lister (Witt rock, Are schoug!); Iceland (Jons- 

 son I); the Faeroes (Borgesen!); Scotland: Berwick of Northum- 

 berland and Bute of Arran (Batters!); Ireland: Roundstone (!) ; 

 France: Cherbourg (Le Jo lis!). 



Subgen. Dermatolithon Fosl. 

 Alg. Not. (1904), p. 3; gen. Dermatolithon Fosl. List of'Lithoth. (1898), p. 11. 



Lithophyllum pustulatum (Lamour.) Fosl. 1 ) 



Alg. Not. (1904), p. 3; Melobesia pustulata Lamour. Polyp, flex. (1816), 

 p. 315, pi. 12, fig. 2. 



f. australis Fosl. mscr. 2 ) 



Frond orbicular or reniform, then often confluent or becoming 

 irregular, attached, edge sometimes free, 50—350 /* thick, composed, 

 of two or few layers of cells; conceptacles of sporangia and 

 cystocarps subhemispheric-conical, 300 (250) — 450 (500) /* in dia- 

 meter; sporangia four-parted. 



f. intermedia Fosl. mscr. 



Frond as in the preceding form ; conceptacles of sporangia 

 and cystocarps hemispheric-conical or subconical, 300 (250) — 450 

 (500) ;j. in diameter, sporangia two-parted. 



f. macrocarpa (Rosan.) Fosl. 



List of Lithoth. (1898), p. 1 1 ; Melobesia macrocarpa Rosan. Rech. Melob. 

 (1866), p. 74, pi. IV, fig. 4—8, 11—20; Aresch. Obs. Phyc. Ill (1875), p. 2! 

 Farl. New Eng. Alg. (1881), p. 180! Simm. Meeresalg. d. Fseroer (1897), p. 268; 

 Dermatolithon macrocarpum (f. faroensis) Fosl. Rem. Melob. Herb. Crouan. (1900), 

 p. 15, Rev. Syst. Surv. Melob. (1900), p. 21; Borg. Mar. Alg. Faeroes (1902), 

 p. 401: De Toni, Syll. Alg. IV (1905), p. 1772. 



Frond orbicular or reniform, then often confluent, attached, 

 edge sometimes free, 100 — 600 \x thick; conceptacles of sporangia 

 and cystocarps hemishperic-conical, 400—600 fi in diameter; spor- 

 angia two-parted. 



J ) Cp. below under Lithoph. macrocarpum, p. 127 — 128. 

 2 ) I have not seen f. crinita Mob. (Notarisia 1892, p. 1441) from Malta. 

 Therefore I pass over it for the present. 



