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Peltigera canina (L.), Hoffm., var. membranacea, Ach. Earth, etc. Rapid City. 
Solorina saccata (L.) Ach. Moist earth among moss on rocks in deep cafions. 
Plentiful. Rapid City. 
Pannaria nigra (Huds.) Nyl. Common on rocks, particularly limestone. Rapid 
City. : 
Collema pulposum (Bernh.) Nyl. (?) Moist earth. Rapid City. 
Leptogium lacerum (Sw.) Fr. Among moss. Rapid City. 
Leptogium dactylinum, Tuckerm. Rocks. Custer City (Bessey) ; ‘Rape City. 
Leptogium pulchellum (Ach.) Nyl. (?) Rocks and among moss. Rapid City. 
Placodium elegans (Link) DC, Plentiful on rocks. Custer City (Rydberg, Bes- 
sey); Rapid City. ae 
LPlacodium murorum (Hoffm.) DC., var. miniatum,Tuckerm. Rocks. Custer City 
(Bessey) ; Rapid City. 
Placodium cirrochroum (Ach.) Hepp. This beautiful species occurs plentifully on 
rocks at Rapid City, but is always sterile. 
Placodium fulgens (Sw.) DC. Sterile and calcareous soils, Rapid City. Not rare, 
but not nearly so plentiful as in the Bad Lands. 
Placodium fulgens (Sw.) DC., var. bracteatum, Ach. With the species. ; 
Placodium mycrophyllinum, Tuckerm. Dead wood and bark of trees, Custer City 
(Rydberg); Rapid City. A common species. 
Placodium citrinum (Hoffm.) Leight. Very plentiful on rocks. Custer City (Bes- 
sey); Rapid City. 
Placodium ferrugineum (Huds.) Hepp., var. Bolanderi, Tuckerm. Rocks. Custer 
City (Bessey), rare. 
Placodium vitellinum (Ehrh.) Neg. and Hepp. Rocks. Custer City (Bessey) + 
Rapid City. Not uncommon. : ; 
Lecanora rubina (Vill.) Ach. Rocks. Custer City (Bessey, Rydberg); Rapid 
City. Very common. 
Lecanora rubina (Vill.) Ach., var. opaca, Ach. With the species. 
Lecanora muralis (Schreb.) Scheer. Rocks. Rapid City. : 
Lecanora muralis (Schreb.) Scher., var. saxicola, Scher. Rocks. Rapid City. 
Not uncommon. ‘ 
Lecanora frustulata (Dicks.) Mass. Rocks. Custer City (Bessey), and what 1s 
probably this species at Rapid City. 
Lecanora sordida (Pers.) Th. Fr. Rocks. Rapid City. 
Lecanora subfusca (L.) Ach. Trees, wood and stone. Rapid City. 
Lecanora Haydeni, Ach. Rocks and dead wood. Rapid yen Not uncommon and 
very variable. 
Lecanora melanaspis (Wahl.) Ach. Rocks. Rapid City, and what seems to be the 
same thing at Custer City (Bessey). Rare. 
Lecanora cinerea (L.) Sommerf. Rocks. Custer City (Bessey); Rapid City 
Common. 
Lecanora caicarea (L.) Sommerf. Rocks. Rapid City. 
Lecanora chlorophana (Wahl.) Ach. Rocks. Rapid City. 
Lecanora xanthophana, Nyl. Rocks. Rapid City. Common. a 
Lecanora xanthophana, Nyl., var. dealbata, Tuckerm. Rocks. Rapid sae? ens - 
occurs with the species. : 
