DES LICHENS. td 
Trib. IH. Stereocauleæ. 
Podetia solida e filamentis adglutinatis formata, gonidia 
in foliolis graniformibus podetiis adfixis obvenientia. Apo- 
thecia lecideina (nigra.) 
Stereocaulon, Schreb. 
Trib. IV. Cladonieæ. 
Podetia fistulosa e filamentis adglutinatis formata, inter 
qua dispersa adsunt gonidia. Foliola thalli (ubi non defi- 
ciunt) structuræ ejusdem ac podetia. Apothecia biatorina 
(varie colorata). 
Cladonia, Hoffm. 
Trib. V. Bæomyceæ. 
Thallus crustaceus proferens podetia e filamentis formata, 
brevia, simplicia, singula apothecio unico biatorino termi- 
nata. 
Bæomyces, Pers. 
Series IIT. INTRICATÆ, 
Thallus fruticulosus vel filamentosus, ramosus, teres vel 
compressus (absque foliolis ullis vel crusta basali); gonidia 
zonatim inter radices filamentorum medullarium sub strato 
corticali undique disposita. Apothecia lecanorina vel lecideina. 
Trib. VI. Roccelles. 
Thallus cortice corneo tenui, medulla copiosa filamentis 
implexis consistens iodo addito cærulescentibus. Apothecia 
normaliter lecideina. 
Roccella, DC. 
Trib. VIIL Usneæ. 
Thallus ramosissimus teres, medulla externe e filamentis 
