102 M. FOSLIE. [1905 



vinge!)? 1 ); Sweden: Koster (Bovallius and Kj ell man I)? 1 ) 

 Norway: Hvaloerne(!)? 1 ). 



The form callithamnioides is known from the Mediterranean 

 (Falkenberg, Solms Laubach, Bert hold), the Adriatic 

 (Hauck, Wille!), Rhodes (Nemetz sec. Reinbold) 2 ); the Ca- 

 nary Islands: Teneriffe (Sauvageau!); the West Indies: Baha- 

 mas (Howe!) 3 ). 



Subgen. Heteroderma Fosl. 

 Syst. Surv, Lithoth. (1898), p. 6, Alg. Not. (1904), p. 3; char. mut. 



Frond monostromatic with or without solitary small cortical 

 cells, except around the conceptacles. 



2. Melobesia Lejolisii Rosan. 



Rech. Melob. (1866), p. 62. 



f. typica. 



M. Lejolisii Rosan. 1. c. p. 62, pi. I, fig. 1—13; pi. VII, fig, 9—11. 



Conceptacles of sporangia and cystocarps crowded, convex 

 or subhemispherical, 150—250 (300) \i in diameter. 



f. limitata Fosl. mscr. 



Conceptacles of sporangia and cystocarps subhemispheric-coni- 

 cal, lessxrowded than in the typical form. 



Syn: Melobesia membranacea Aresch. Phyc. Scand. (1846), p. 289 et in 

 J. Ag. Spec. Alg. 2. (1852), p. 512, partim; Harv. Phyc. Brit. (1846—51), pi. 

 347 A; Le Jol. Liste Alg. Cherb. (1863), p. 150, partim! Crouan. Alg. mar. Finist, 

 no. 244, Fl. Finist. (1867), p. 150! Kleen, Nordl. Alg. (1874), p. 1 1 ? Magnus, 



r ) As above remarked, the specimens from these places are uncertain and 

 perhaps belonging to M. Lejolisii. 



2 ) T h. Reinbold. Meeresalgen von der Insel Rhodos. Gesammelt von 

 Lehrer J. Nemetz. Hedwigia. Bd. XXXVII. 1898. Pag. 90. 



3 ) The occurrence of f. callithamnioides on the south coast of England seems 

 doubtful to me. Cp. Batters, A Catalogue of the British Marine Alga? 

 (1902). Pag. 96. I have a sterile specimen from Mr. Batters' herbarium 

 under the name of M. callithamnioides collected at Plymouth, which in 

 my opinion represents a young Lithoph. zonule. Cp. Crouan in Ann. 

 Sc. Natur. Ser. 4. Bot. T. XII. Paris 1859. PI. 21, fig. C. 15. This 

 form of Lithoph. zonule and M. furinosu f. callithamnioides as well as 

 M. minutulu f. lacunosa approach each other in habit. 



