264 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



Caudelariella vitelUna (Ehrh.) Muell. On prairie bowlder near 

 the Des Moines. 



Placodium viicrophyllinum Tuck. On red cedar stump, banks of 

 High lake. 



Placodium aurantiacum (Lightf.) Hepp. Very common on 

 green ash. 



Teloschistcs chrysopthalmus (L.) Th. Fr. Quite abundant on 

 trees and on old wood. 



Teloschistes poly car pus (Hoffm.) Tuck. Common on trees. 



Teloschistcs Ivchnens (Ach.) Tuck. Common and appears to be 

 variable. 



Teloschistcs concolor (Dicks.) Tuck. Abundant on trees, old 

 wood and on rocks. One form appears to the writer to be var. 

 effusus Tuck. But this has not been verified. 



Teloschistcs parictinus (L.) Th. Fr. Common on trees, High 

 lake. 



Family Physciaceas. 



Rinodina orcina (Ach.) Mass. On prairie bowlder, near Des 

 Moines river. 



Rinodina sophodcs (Ach.) Koerb. On bitternut, High lake. 



Physcia spcciosa (Wulf.) Nyl. On earth, Estherville woods. A 

 specimen collected on Salix on bank of High lake was referred to 

 this species but is missing from the author's collection. 



Physcia pulverulenta (Schreb.) Nyl. var leucoleiptis Tuck. Sev- 

 eral specimens were referred to this subspecies by Mr. Plitt. 



Physcia stellaris (L.) Nyl. Our most common lichen, found 

 everywhere on trees. 



Physcia tribacia (Ach.) Nyl. Abundant on oaks (Qiiercns 

 macrocarpa) in pastured woods near High lake. 



Physcia ohscura (Schaer.) Nyl. Common on trees. High lake. 



Physcia adglutinata (Floerke) Nyl. Very common on trees 

 everywhere. 



Sub-Order Pyrenocakpine.^. 

 Family Dermatocarpaceae. 

 Dcrmatocarpon sp. uncertain. On prairie bowlder near Des 

 Moines river. 



CLASS BRYOPHYTES. 



SUB-CLASS HEPATICE.-E. 

 Ricciclla fluitans (L.) Br. The Slender Riccia. Both the terres- 

 trial and the aiiuatic forms collected in small sloughs near Mud lake. 



