RINODINA. 209 



finally turgid and excluding the paler, entire, obtuse margin. 

 Spores ^ raic. 



On various trees of the Pacific Coast. California, Bolancler. 



Oregon, Hall. In a part of the specimens the apothecia shew 



a white bloom ; but there is no trace of this in the majority. 



Apothecia O mm -, 8 to l mm -, 2 wide. 



10. E. Bischoffii (Hepp.) Koerb. ; thallus thin, mealy or 

 granulose, or obsolescent; whitish, ash-coloured, or brownish; 

 apothecia small, zeorine, sessile, flat, or finally convex j the disk 

 blackening ; the entire thalline margin also blackening, and the 

 fruit at length lecideoid. Spores broad-obtuse-ellipsoid ; the 

 wide interval between the spore-cells suggesting a dark band ; 

 ^ m i c> Koerb. Parerg. p. 75. Th. Fr. Scand. p. 204. 



Lime-rocks, Texas (Wright), Tuckerman Gen. 1872. Kan- 

 sas, Hall. Rocky Mountains, Hayden in Jib. Willey. 



11. E. flavo-nigella, Tuckerrn. in litt.\ thallus tartareous, 

 contiguous, granulate-rugose ; from greenish- becoming bright- 

 lemon-yellow ; apothecia smallish, appressed, zeorine, flattish ; 

 the scabrous disk brownish-black, at length convex j the thalline 

 margin sub-entire. Spores -^ mic. 



Rotten wood. Gainesville, Florida, Eavenel. Cotoosa River, 



Fla., Austin. Mobile, Alabama, Dr. Mohr. Apothecia O mm - , 



8 to l mm -, 2 wide. 



12. E. aterrima (Krerapelh.) Anz. ; thallus effuse, thin, 

 granulose or scurfy; dark-greenish-black, consisting of brown 

 gonidia ; apothecia minute, lecanorine, innate-sessile, very black. 



Spores soleseform, ^ mic. Anz. Symb. Lich. Ear. p. 11, & 



Licli. Langob. n. 4G1. Microthelia Metzleri, Koerb. 



Granitic rocks, Yosemite Valley, California, abundant, Bo- 

 lander. San Diego, Cal., Miss Plummer in hb. Farlow. 



Spores Varely 4-locular. But this can hardly be taken for suffi- 

 cient to make two species of the lichens cited. Compare Lahm 

 Anmerk. in Rabenh. Lich. Eur. Fasc. 29 ; and also Hedwigia, 

 1867, p. 154-5. 



13. E. Thomce, Tuckerm. in litt. ; thallus tartareous, chinky; 

 smooth; straw-coloured; on a black hypothallus; apothecia 

 small, lecanorine, adnate, flattish ; disk black ; the entire, ob- 



14 



