348 BOTANY OF SOCOTRA. 



Order III. LICHENACE.E. 



Lichenncei, Nyl. Ess. 167 (sine charact.). 

 Gncsiolichencs, Mass. Sched. Crit. 15 (sine charact). 

 Hetcrolichenes, Th. Fries Heterol. 42 (1861). 

 Eulichenes, Mull. Arg. Lich. Geneve 21 (1862). 



Obs. Heteroliehenes, Gnesiolichenes et Eulichenes, nomina grsecolatina, 

 melius recusanda sunt. 



Tribe 1. Cladonie^e. 

 Cladoniece, Miill. Arg. Lich. Geneve 22 ; Stitzb. Beitr. 166. 



CLADONIA. 



Cladonia, Hoffm. Deutschl. Flora ii. p. 114 ; Florke Cladon.; Nyl. Syn. 187 ; Th. Fries Heterol. 



76 ; Stitzb. Beitr. 167. 

 Cladonia et Cladina, Nyl. Syn. Lich. Nov. Caledon. 9 et 11. 



A genus of numerous and generally very polymorphous species, mostly 

 common and more or less cosmopolitan. 



C. verticillata, Florke Cladon, p. 26. 



Soeotra. Terricola. B.C.S. n. 1422 (male evoluta et sterilis). 

 Distrib. Very common all over the world. 



Tribe 2. Roccelle^e. 



Rocccllew (Mass. Sched. Crit. sine charact.), Stitzb. Beitr. 175. 

 Eoccellei, Nyl. Syn. 256. 



This small tribe is distinguished from all other dendroid lichens by the 

 peculiar form and evolution of the gonidia (see Schwendener Untersuch. i. p. 

 57, t. 6, figs. 2-17). 



ROCCELLA. 



Roccclla, Ach. Lich. Univ. 81, t. 7, f. 8-9 ; Nyl. Syn. 257 ; Th. Fries Heterol. 50 ; Stitzb. Beitr. 

 175 ; Tuck. Gen. 4. 



A small genus of both hemispheres of the new and the old world, and con- 

 sisting of generally saxicole or rarely corticole species, found in maritime 

 regions or in the neighbourhood of the sea. 



1. R. tinctoria, DC. Flor. Franc, ii. p. 334. 



Nom. Vern. Shennah (B.C.S.). 



Soeotra. B.C.S. nn. 1391 pro parte, 1408 pro parte, 1429 pro parte. 

 Graniticola supra Wadi Kischen, alt. 1000 m. Schweinf. 



