47 

 CLAVIS DISPOSITIONS FRIESIANJE. 



To yodftfAtt asroxrtivti, TO %i trttufta ^uovroiu. 



Ord. 1. GYMNOCARPI, Schrad. 



CHAR. Apothecia aperta, discifera. 



Trib. I. PARMELIACE^E, Fr. Discus subrotundus, persistens, 



ab excipulo thallode marginatus. 

 A. UsneacetR, Eschw. Discus apertus. Thallus subverticalis 



(aut pendulo-sarmentosus], centripctus, hypothallo destitutes. 



I. USNEA, Dill, Hoffm. Apothecia orbiculata, peltata; discus aper- 



tus, strato medullari filamentoso impositus. Stratum thalli 

 corticate a medullari Jilamentoso secedens. 



1. abrbata, (L.) Fr. 



. florida, Fr. (U. florida, Ach.) 

 /?. hirta, Fr. (U. hirta, Ach.) 

 y. plicata, Fr. (U. plicata, Ach.) 

 1 dasypoga, Fr. (U. barbata, Ach.) 



2. longissima, Ach. 



3. komalea, Tuckerm. MS. (Ramalina, Ach.) 



II. EVERNIA, Fr. Apoth. orbiculata, scutelliformia; discus apertus, 



strato medullari floccoso impositus, coloratus. Thallus sluppeus, 

 fistulosus aut strato medullari Jloccoso contiguo farctus. 

 1. Cornicularia, Dec. fructiculos (aut sarmentosse) apoth. 

 lateralibus. 



1. jubata, (L.) Fr. 



a. bicolor, Fr. (Cornicularia, Ach.) 



/5. chalybeiformis, Ach. (Alectoria, Ach.) 



y. implexa, Fr. (Alect. Ach.) 



2. divergens, (Ach.) Fr. 



3. ochroleuca, (Ehrh.) Fr. 



. rigida, Fr. (Cornicularia, Ach.) 

 y. sarmentosa, Fr. (Alectoria, Ach.) 



4. vulpina,(Wu\f.) Ach. 



2. Dufourea, Ach. fruticulosa, inflata, apoth. terminalibus. 

 3. Physcia, Dec.foliaceo-compressa, (filamentosa semper ste- 

 rilis) subtus canaliculata. 



5. prunastri, (L.) Ach. 



6. furfuracea, (L.) Mann. (Borrera, Ach.) 



III. RAMALINA, Ach. Apoth. orbiculata, scutelliformia; discus strato 

 gonimo (viridi) impositus subconcolor. Thallus subcartilagine- 

 ws, undique fcrtilis et similaris. 



1. calicaris, (L.) Fr. 



a. fraxinea, Fr. (R. fraxlnea, Ach.) 



/3. fastigiata, Fr. (R. fastigiata, Ach.) 



y. canaliculata, Fr. (R. fastigiata, var. Ach.) 



1 farinacea, Tuck. (R. farinacea, Ach.) 



2. polymorpha, Ach. 



IV. ROCCELLA, (Bauh.) Decand. Apoth. orbiculata, scutelliformia; 

 discus strato carbonaceo impositus, ater pruinosus. Thallus 

 cartilagineo-coriaceus. 



