IOWA ACADEMY OP SCIENCES. 185 



Placodiumf errtigineum Unds., Hepj). 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. 



Lecav or a pallida Schreb, Schser, var. cancriformis Tuck. On 

 trees, rare. Fayette. 



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

 fences, infrequent. Fayette. 



Lecanora cinerea L. Sommerf. On sandstone, probably com- 

 mon. Clayton county. 



Lecanora fuscata Schrad.,Th. Fr., var. rufescens Th. Fr. On 

 granitic rocks, frequent. Fayette. 



Lecanora priqigna Ach. , Nyl., var. clavus Koerh. On calcar- 

 eous rocks, rare. Clayton county. 



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

 ette and Bremer counties. 



Rinodina sophodes Ach., Nyl., var. telhraspis Tuck. On sand- 

 stone, rare. Clayton county. 



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



Biatora decipiens 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 carnulenta Tuck, On decorticated wood, rare. Fay- 

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

 Morton E. Peck. 



Bvellia myriocarpa DC, Mudd., var. polysporaWilley. 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. 



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

 ette. 



Opegrapha 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. Sci , vol. Ill, pp. 73- 



