DUBING THE 'CHALLENGER* EXPEDITION. 223 



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iniTpqualis continuus, passim rimosus (K — , I — ); apothecia nigra 

 adnata plana (latit. 0'5-0'8 millim.), marginata, parum prominula ; 

 spora? 8n3e, fuscse, ellipsoidese, 1-septatse, longit. 0010-0 012 

 millim., crassit. O"006-0'007 millim. ; parapliyses fere mediocres 

 clava fusca apice incrassatse; typothecium fuscum. lodogelatiua 



hymenialis intensive cserulescens. 



" Species bene distincta videtur in stirpe Lecidece dispersed 

 (Mass.). Spermatia oblongo-cylindrica, longit. 0*003 millim., 

 * crassit. 0*001 millim." JV^Z. in litt. 



On rocks : very sparingly seen. 



Island of Juan Fernandez. 



1. LepTOGIUM AZTJRErM {8w,)^ Ach. 



On trunks of trees : fertile. 



2. B.i:OMTCES CHILENSIS (Jl/>^^.),iV^y?. 



On the ground : fertile. (This, in all probability, is to be re- 

 garded as a proper species, distinguished by the thin, whitish, 

 rugulose, continuous thallus). 



3. Steheocatilon bamtjlostjm {Ach.), Nyl. 



Apparently on the ground : a slender state, fertile. 



4. Cladia aogeegata {Sw,), Nyl. 

 On the ground : a young state, infertile. 



5. Sticta subtaeiabilis, Nyl, in Flora, 1867, p. 439. 

 On mossy trunks of trees : infertile. 



6, S. HYPOPSILA, -3Z?^^. 



On trees : sparingly fertile. 



7. S. lineariloba (ilf^f .), -SJ^Z. 

 On trees : very sparingly fertile. 



8. Thelotrema ? 



On the bark of trees : indeterminable. 



9. Urceolaria scruposa, Ach. 



On the ground : the host of the following species. 



10. Lecidea Fernandezii, Cromh. Omnino est similis L. 

 Vrceolarics, Nyl. in Flora, 1873, p, 298, Norrl. Fl. L. F. no. 193, 

 differt autem hypothecio et perithecio fuscis, sporisque fere mino- 

 ribus, longit. 0*010-0014 millim., crassit. 0*004-0"006 millim. 

 Forsan varietas X. Urceolaria, 



Parasitic on the thallus of Urceolaria scruposa. 



