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Genus XIII. The lot r erna. A ch AH. 



T. lepadinum. ACH. Haud frequens in cortice Quer- 

 cuum anzaosarum. 

 Genus XIV. Squamaria. D.C. 



Sq. Smithii. D.G. Raro in rupestribus prope Bol- 

 lendorf. 



Tribus VII. Placodiaceae. N. Receptacula 

 thallo foliaceo inserta. 

 Genus XV. Placodium. D.C. 



P. candelarium. D.C. In arborum truncis, rupibus et 



muris haud raro. 

 P. murorum. D.C- In lapidibus et muris. 

 P. ochroleucum. D.C. In rupibus prope Mersch, 



Rosport, Bollendorf, &c. 

 P. canescens. D.C. In truncis arborum murisque satis 



frequens. 

 P. albescens. D.C. In muris prope Boneweg, Luxem- 

 burg, Preiscb, &c. 

 P. radiosum. D.C. In lapidibus et muris prope Pul- 

 vermüblen, Puttelingen, Diekirch, &c. 

 Genus XVI. Collema. hoffm. 

 C. microphyllum. D.C. 



/8. brunneum. N. — Patellaria brunnea. D.C. 

 In arborum truncis et ad terram prope Eisenburg. 

 C. fasciculare. D.C. In truncis Populi nigrae prope 



Domeldingen. 

 C. tenuissimum. ach. Ad terram arenosam prope 



Kopstal. 

 C. nigrescens. D. C. Ad radices truncosque arborum 



prope Budersberg. 

 C. saturninum. D.C. Ad truncos Juglandis prope 

 Diekirch. 

 Genus XVII. Imbricaria. D.C. 



Sec- 



