I'"lllk : LICHENS OF THE MINNESOTA VALLEY. 281 



Rinodina lecanorina MASS. 

 Urceolaria actinostoma PERS. 

 Buellia pullata TUCK. 



New to Minnesota on limestone. 

 Omphalaria kansana TUCK. 

 Omphalaria pulvinata NYL. 

 Collema plicatile SCHAER. 

 Collema pustulatum ACH. 

 Lecanora bookii (FR.) TH. FR. 

 Rinodina bischoffii (HEPP.) KOERB. 

 Buellia alboatra (HOFFM.) TH. FR. var. saxicola FR. 

 Staurothele diffractella (NYL.) TUCK. 



New to Minnesota on wood. 

 Placodium ferrugineum (HUDS.) HEPP. 

 Placodium ferrugineum (Huos.) HEPP. var. pollinii TUCK. 

 Cladonia cristatella TUCK. var. paludicolaTucK. 

 Biatora flexuosa FR. 

 Biatora suffusaFR. 

 Buellia turgescens (NYL.) TUCK. 

 Opegrapha varia (PERS.) FR. var. pulicaris FR. 

 Arthonia sp. 



Endocarpon arboreum SCHWEIN. 

 Pyrenula gemmata (Acn.) NAEG. 

 Pyrenula hyalospora NYL. 

 Pyrenula quinqueseptata (NYL.) TUCK. 

 Pyrenula glabrata (ACH.) MASS. 

 Pyrenula megalospora sp. nov. 



New to Minnesota on earth. 

 Heppia despreauxii (MONT.) TUCK. 

 Heppia polyspora TUCK. 

 Collema tenax (Sw.) ACH. 

 Biatora decipiens (EHRH.) FR. 

 Biatora decipiens (EHRH.) FR. var. dealbata AUCT. 



The list of species new to the state shows a large number of 

 Pyrenulas, the genus being unusually well represented in the 

 valley, especially at Mankato. It will also be seen that the 



