174 IOWA ACADEMY OF SCIENCES. 



the botanical section of the A. A. A. S. at the Columbus meet- 

 ing I made mention of some of these plants, but several are 

 of special interest because rare or difficult to detect, and I 

 have thought it worth while to record all for distribution. 

 Aside from a single collection by myself in Illinois, the col- 

 lectors are L. H. Pammel, E. Bartholomew, C. J. Herrick, C. 

 H. Demetrio and R. Dunlevy. The collection made by Pro- 

 fessor Pamtnel at La Crosse, Wis., is of special interest 

 because it contains an unusually large number of interesting 

 lichens for a small collection. With the exception of the single 

 specimen from Illinois, the plants are all recorded from states 

 whose lichen floras are little known; hence the recDrd is the 

 more needed. 



LIST OF SPECIES AND VARIETIES. 



Usnea barbata (L.) Fr., var. florida Fr. On trees, Socorro 

 county. New Mexico, March, 1895. Coll., C. J. Herrick. Plants 

 well developed but sterile. 



Theloschistes parietinus (L.) Norm.? On Celtis occidentalis. 

 Rooks county Kan., December, 1893. Coll., B. Bartholomew. 

 Sterile, but the thallus seems characteristic. 



Theloschistes lychneus (Nyl.) Tuck. On Celtis occidentalis. 

 Rooks county, Kan., December, 1893. Coll., E. Bartholomew. 

 Specimens finely fruit 3d and approaching Theloschistes poly- 

 carjms Ehrh., Tuck. 



Parmelia consjjersa (Ehrh.) Ach. On rocks, Socorro county, 

 New Mexico, April, 1895. Coll., C. J. Herrick. 



Physcia stellaris (L.) Tuck. On trees. La Crosse, Wis., Jan- 

 uary, 1895. Coll., L. H. Pammel. Socorro county, New 

 Mexico, March, 1895. Coll., C. J. Herrick. 



Eq Physcia steUaris (L.) Tuck., var. apiola Nyl. On rocks. 

 Socorro county, New Mexico, April, 1895. Coll., C. J. Her- 

 rick. Thallus lobes poorly exhibited in specimen seen. 



Physcia obscura (Ehrh.) Nyl. On old wood. Cole county, 

 Mo., August, 1898. Coll., C. H. Demetrio. 



Peltigera pulverulenta (Tayl.) Nyl.? On earth. La Crosse, 

 Wis., January, 1895. Coll., L. H. Pammel. The sterile spec- 

 imen may be Peltigera horizontalis, L. Hoffm., instead, as the 

 spores are needed to render determination certain. 



Pannaria languinosa (Ach.) Koerb. On shaded rocks. Win- 

 field Kan., 1896. Coll., R. Dunlevy. 



