Ord. BYSSACE^E, Fr. 



Char. Thallus liber, discretus, hygrophanus, floccosus 1. in fron- 

 dem gelatinosam absque omnibus stratis discretis conglutinatus. 

 Sporffi receptse ascis thalamio vulgo immersis, interdum liberis. 

 JllgtB amphibia, perennes per intervalla in vegetation e retardates, 

 heterogenecB, nulla vero strata discernentes, sporidiis gonidiisque 

 multiplicalcR. 



Trib. I. COLLEMACE^E, Fr. Thallus gelatinoso-conglutinatus, 

 caulescens aut foliaceus. Apoth. endogenea. 



I. LICHINA, Ag. Apoth.clausa terminalia,libera, poropertusa, tan- 



dem explanata ; thallus cartilagineus, dichotomus. (In scopulis 

 marinis.) 



II. NOSTOC, Vauch. Apoth. clausa minutissima, thallo immersa, 



nucleum eructuantia ; thallus gelalinosus, Jttis moniliformibus 

 curvalis farcins. (Nostocia plura terrestria ad Collemata per- 

 tinent. Fr.) 

 1. commune, Vauch. 



III. COLLEMA, Hoffm. Apoth. discoid eo-aperta, excipulo thallode ; 

 thallus pulposus, contextu moniliformi-Jilamentoso. 



1. pulposum, (Bernh.) Ach. 



2. tenax,(Sw.) Ach. . 

 /3. pallescens, Ach. 



3. me/<EMm, Ach. 



4. fasciculare, (L.) Ach. 



5. pustulatum, Ach. 



6. palmatum, (Huds.) Ach. 



7. salurninum, (Dicks.) Ach. 



8. nigrescens, (Huds.) Ach. 



9. pulchellum, Ach. 



10. tunazforme, Ach. 



11. Jurvum, Ach. 



