GEOLOGICAL SUEVEY OF THE TEEEITOEIES. 791 



Placodium vUellinunij (Ehrb.,) Acb. — On dead wood. (21.) 



Placodium luteo-minium, Tuckerra. Licb. Calif., p. 18. — A small Placo- 

 dium growing' among mosses, wbicb seems referable bere. (22.) 



Placodium , (?) — A few scattered apotbecia witb a plane ferru- 



giueoiis disk, in rocks among otber licbens, not sufficient for determina- 

 tion. (23.) 



Lecanora ruMna, Acb., var. peltata, D. 0. (24.) 



LecanGva riibina^ Acb., var. opaca^ Acb. — Tbe specimens of botb tbese 

 varieties abundant. {2la.) 



Leca)iora jnuraUs, (Scbreb.) Scbeer. (25.) 



Lecanora , (f) (2G.) 



Lecanora , ('?) (27.) 



Tbese two licbens belong to tbe section Squamaria, but I am unable 

 to identify tbem from tbe scanty fragments. Tbe tbalius resembles 

 tbat of L. cartilaginea, as described, but tbe apotbecia are like tbose of 

 L. subfusca ; in tbe one witb a convex, rufous fuscous disk and entire 

 margin ; in tbe otber witb a plane, black disk and llexuous margin. 

 Spores simple, .012-15 min. long,.one-balf as wide. Botb are perbaps 

 .forms of tbe same plant. 



Lecanora subfusca, Acb. — On stones and dead wood. (28.) 



Lecanora varia, Fr. — On dead wood. (29.) 



Lecanora Hagenij Acb. — On stones. (30.) 



Lecanora cinerea, L., var. Soffnianni, Acb. — Some of tbe specimens 

 have a plicate crust, but seem not separable. (31.) 



Lecanora rhagadiosa, Acb. [Acaraspora scahra/rii. Fr. Scaud., p. 208.) — 

 Eed Mountain, elevation 9,000 feet. j!:^ew to tbis continent, and, witb 

 Lecidia mamillaris mentioned below, an interesting addition to the few 

 licbens common to only tbe western slope of North America and Europe. 

 (32.) 



Lecanora xanthopliana, Nyl. — On rocks. (33.) 



Lecanora chlorophana, (Wabl.) Acb. — On rocks. 



Lecanora ScJdeicJieri, (Ach.,) ]S[yl. — On the earth, the specimens scanty. 

 (35.) 



Lecanora cervijia, (Pers.,) Somf., var. glaucocarpo., Somf. (35.) 



Lecanora cervina, (Pers.,) Somf., var. squaonulosa, Fr. — Some of the 

 specimens have prominent brownish black spermogones with minute 

 spermatia, .002 min. long. (36a.) 



Lecanora cervina, (Pers.,) Somf., var. glehora, (Kb v.) — The specimens 

 are numerous, some of them a|)proacbiug the var. disacta, Fr. (36&.) 



Lecanora , (?) Tbalius areolate verrucose, csesius pruinose. 



Apotbecia immersed, 1 to 3 in the areoles, the disk plane, black or 

 white pruinose. Thekes myriospborous. Spores elliptical, .005-006 

 min. long, one-half as wide. On rocks witb tbe preceding, from which 

 it is perbaps distinct. (37.) 



Rinodina sopJiodes, (Acb.,) var. exigiia, ISTyl. — On dead-wood. (38.) 



Einodina Biscliojti, (Hepp.,) Kbv. — On rocks. (39.) 



Cladonia pyxidata, Fr. (40.) 



Cladonia gracilis, Fr., var. verticillata, Fr., Charles H. Peck, esq, (40&.) 



Cladonia fumbriata, Fr. (40*.) 



Cladonia rangiferina, Hoffm. (41.) 



Cladonia squamosa., var. delicata, Fr. Charles H. Peck, esq., (41&.) 



Biatora decipicns, Fr, (42.) 



Biatora luridella, Tuckerm. (43.) 



Lecidea contigua, Fr. — A single specimen. (44.) 



Lecidea (?) — A small lichen on dead wood, with the habit of L. 



melancheuria, but with larger si)ores. Perhaps to be referred to L. sabu- 

 letorum, Fr. (45.) 



