GKOLOGY OF LA SALLE COUNTY. 



143 



which is o-ranulate or broken, apothecia very 

 small, yellowish, rufous or blackish, disk flat, 

 marofin thin. B. exigua, Chaub. Fr. L. E. 

 278. On oaks and hickories. 

 , B. rubella, Ehrh., Rabenh. Thallus yellowish or 

 o-ra^'ish oreen, effuse, confluent, apothecia luteo- 

 rufescent, or reddish brown, scattered or con- 

 o-reo-ate, becomino- tumid and marg-in excluded, 

 ^ the latter often whitish. Spores pluri-locular. 

 Lecidea, Schser. Spicil. 168. Bac^dia, Th. Fr. 

 Scand. 344. On basswood and elm along- rivers. 



B. fusco-rubella. Hoffm. Thallus ofranulate, ru- 

 gfose, chinky, ash-colored, apothecia medium 

 size, sessile, flat, disk of ten turg'id, rust-colored, 

 chestnut or even black. Bacidia, Th. Fr. Scand. 

 346. A variet}^ of the preceding-. 



B. suffusa, Fr. Thallus the same as in No. 91. 

 Apothecia ample, reddish brown, suffused par- 

 tiallv or wholly with. white,- disk rufescent, be- 

 , - coming' darker, turg-escent, excludiJigf the mar- 

 g'in, suffused with white. Tuck. Gen. Lich. 

 166. On elm and other trees. 



B. inundata, Fr. Thallus scurfy, g-reenish, rimose- 

 areolate, apothecia minute, sessile or adnate, flat 

 . or convex, tumid-brownish, black, often exclud- 

 ing- the margfin, h:3^pothecium pale. Spores slen- 

 der. Secolig-a, Stizenb. Bacidia, Koerb. On 

 rocks and pebbles, also on old mortar. 



B. cyphalea, Tuckerm. Thallus thin g'ranulose, 

 cinerascent, apothecia small, dark reddish or 

 rust-colored. Tuck. Syn. Pt. 2. 51. Rare on 

 elms. 



B. calcivora, Moss., Nyl. On Trenton rocks, Ver- 

 million river. Apothecia immersed, thallus 

 confused. ' . : : ; : 



