IOWA ACADEMY OF SCIENCES. 185 



Placodium ferriigineum Huds., Hepp. On trees, rare. Bremer 

 and Fayette counties. 



Placodium murorum Hoffin, DC. On rocks. Northwestern 

 Iowa. Coll., Prof. B. Shimek, who sent it to me last year. It 

 should have appeared with the lichens listed in his paper* last 

 year, but I could not be sure that it was distinct from P. elegans 

 Link, DC. , without further study. 



Lecavora pallida Schreh, Schasr, var. cancr if ormis Tuc]^. On 

 trees, rare. Fayette. 



Lecanora varia Ehrh, Nyl., var. symmicta Ach. On old 

 fences, infrequent. Fayette. 



Lecanora cinerea L. Sommerf. On sandstone, j^robably com- 

 mon. Clayton county. 



Lecanora fuscat a Schrad.,Th. Fr., var. rufescensTh.. Fr. On 

 granitic rocks, frequent. Faj^ette. 



Lecanora priqigna Kch., Nyl., var. clavusK.oevh. On calcar- 

 eous rocks, rare. Clayton county. 



Lecanora xantliophana Nyl. On granitic rocks, rare. Fay- 

 ette and Bremer counties. 



R in odina sophodes Ach., Nyl., var. telhraspis Tuck. On sand- 

 stone, rare. Clayton county. 



Conotrema urceolatum Ach. , Tuck. On trees, rare, Fayette. 



Biatora deciqnens Ehrh, Fr. var. dealbata Auct. On calcareous 

 earth, rare. Fayette. 



Biatora russellii Tuck., var. dealbata Tuck. On calcareous 

 rocks, rare. Fayette 



Biatora fossarum Duf., Mont. On calcareous earth, rare. 

 Fayette. 



Biotora carniilenta Tuck. On decorticated wood, rare. Fay- 

 ette, and also from Black Hawk county, collected by Mr. 

 Morton E. Peck. 



Buellia myriocarpa DC, Mudd., var. polysjJoraW illey. On 

 tree, rare. Fayette. This rare lichen was also sent to me 

 from Decatur county by Prof. T. J. Fitzpatrick and from La 

 Crosse, Wis., by Prof. L. H. Pammel. A larger form collected 

 by Mr. Morton E. Peck in Black Hawk county must also be 

 referred here for the present. 



Buellia alboatra Hoffin, Th. Fr. On an elm tree, rare. Fay- 

 ette. 



Opegraplia quaternella Nyl. On thallus of a Parmela, rare. 

 Fayette. I have not been able to compare this, but it agrees 



* The Flora of the Sioux Quartzite In Iowa. Proc. Iowa Acad. Scl , vol. Ill, pp. 73- 

 77. 



