THE LICHEN-FLORA OF CHICAGO AND VICINITY. 29 



62. L pfivigna, (Ach.) Nyl. , var. pruinosa, (Auctt.) Apothecia 

 small, appressed, sunken; disk gray-pruinose. Sarcogyne, 

 Koerber. Lecanora, Nyl. 



On sandstone boulders near Lemont. This, and the two pre- 

 ceding forms, are so nearly related that one is puzzled to 

 distinguish them without a familiar acquaintance with suites 

 of specimens from different localities. The most perfect 

 representations of the variety are from the Trenton rocks of 

 LaSalle County, Illinois, and from Tennessee. 



The variety clavus, Koerber, should be found in our limits 

 also. 



63. L, perproxima,* Nyl. Spec. nova. Resembles L. erysibe, 

 Ach., nevertheless the spores are larger, .014-18 by .007 

 mm., and the hymenial gelatine with iodine is a beautiful blue, 

 becoming deep blue. In appearance it resembles L. c^sio- 

 cinerea, Nyl. 



On calcareous rocks at Joliet and elsewhere. 



64. ]_. erysibe, Ach. Thallus cinerous, thin, diffract; apothecia 

 fusco-rufous, plane or convex. 



On calcareous rocks in Will County; abundant. 



Rinodina, Mass. Stizenb. Tuckerm. Thallus crustaceous, apoth- 

 ecia scutellaeform, often zeorine, then lecideine. Spores ellip- 

 soid, bilocular, brown. 



65. R, sophodes, (Ach.) Nyl. Thallus gray or cinereo-fuscescent; 

 apothecia small, appressed; disk flat, fuscous-black; margin 

 entire. Nyl. Scand.. 148. Th. Fr. Scand. 199, Tuck. Syn. 

 207. 



On boulders near Lemont. I have not met with it elsewhere 

 so far north. 



66. R, bischoffi, (Hepp.) Koerber. Thallus ash-colored or fusces- 

 cent; thin, farinose; apothecia small, sessile, flat or convex; 

 margin fuscescent or cinerascent. Spores broad, fruit finally 

 lecideoid. Th. Fr. Scand. 204. Tuck. Syn. 209. 



On calcareous rocks at Joliet and Lemont. A little known 

 species. Occurs more abundantly further south and west. 



*L. perproxima, Nyl. Spec. Nova. Proxima L. erysibe, Ach. Sporis nonnihil 

 majoribus, long, o,oi4-l8, crass. 0.007 millim., et gelatina hymenialis. lodo bene 

 coerulescente, coerulescentia persistente. Facies fere Lecanora cassio-cinerea, Nyl. 



