No. 5] REVISED SYSTEM. SURVEY OF THE MELOBESIEAE. 21 



2. M. callithamnioides Falkbg. nee Crn. (M. farinosa f.?) 



3. M. Lejolisii Rosan. 1 ) 



4. M. confervicola (Kiitz.) Fosl. 



5. M. caspia Fosl. 



6. M. ? Novæ Zelandiæ Heydr. 



Subgen. II. Heteroderma Fosl. 



Thallus composed of more layers of cells. 



7. M. Corallinae Solms (nee Crn.?) 



8. M. coronata Rosan. 



9. M. canescens Fosl. 



10. M. zonalis (Crn.) Fosl. (incl. Hapalidium coccineum Crn. ex 



parte; H. confervoides Crn.; H. roseum Crn.? (non Kiitz); 

 Melobesia myriocarpa Crn.) 



11. AL? Cystosirae Hauck. 



Gen. Dermatolithon Fosl. 



1898. Syst. Sur v. 



Conceptacles of sporangia subimmersed, hemispheric-conical 

 with an apical pore; sporangia with short foot arising from the 

 almost plain disc between club-shaped, free paraphyses. 



Conceptacles of cystocarps, subimmersed, hemispheric-conical, 

 with an apical pore; carpospores arising around the periphery of 

 the conjugation cell, the central parts of the latter with a bundle 

 of short paranemata. 



1. D. pustulatum (Lamour.) Fosl. 



f. typica. 



f. crinita Mob. 



2. D. macrocarpum (Rosan.) Fosl. 1 ) 



f. faeroénsis Fosl. 



x ) I referred in List of Lith. this spedes to Dermatolithon according to Ro- 

 sanoffs descricption of the conceptacles of sporangia. However, I have 

 not ib und the sporangia accompanied by paraphyses and I am inclined to 

 suppose, that the said . organs pictured by Rosanoff, Melob. pl. 1, fig. 8 

 and 13 in fact are carpospores with paranemata. 



a ) Authentic specimen unknown to me. Cp. Fosl. Melob. in herb. Crouan, 

 p. 14. 



