LECAl^ORA. 185 



black-edged, but form no effigurate circumference; apothecia 

 soon turgid and heaped ; disk livid-brown, white-pruinose, the 



blackening margin soon excluded. L. Semitensis, Tuck. Obs. 



Lich. 4, I, c. p. 172. 



e. versicolor, Fr.; thallus reduced, thinner, concrete, very 

 pale, white-powdery. Nyl. Scand. I. c. 



Eocks (and rarely dead wood), a, northern and middle States, 

 Halsey View/ 1823 ; and, following the mountains southward, to 

 Alabama, Peters. Texas, Wright. Missouri & Kansas, Hall. 



California, Bolander. b, North Platte, Hay den. Nevada, 



Bolander. c, California, very common and varied, Bolander. 



d, Yosemite, Bolander ; not to be separated widely from c. 



e, confined to calcareous rocks ; Missouri, Prof. C. U. Shep- 



ard. Kansas, Hall. 



8. L. pinguis, Tuck. ; thallus incrassated-tartareous, adnate, 

 areolate-verrucose j dull-olivaceous-gray, becoming sulphur-col- 

 oured ; as always within ; areoles of the centre scarcely a little 

 discrete and squamiform, but becoming at the circumference 

 radious-plicate j apothecia ample, adnate ; the turgid, yellow- 

 ish-flesh-coloured disk sub-pruinose, the crenate margin at 



length flexuously lobed. Spores oblong, ^^ mic. Obs. Lich. 



3, 1. c. p. 268. 



Coast sandstones, Oakland, etc., California (Bolander), Tuck- 



erman I. c. 1864. Scarcely less emgurate than L. circinata, 



and now recalling even L. concolor to mind. Apothecia 2 mm -, 5 

 to 5 mm - wide. 



* * * Eulecanora. Thallus uniform. Spores ellipsoid, and 

 small, and, in the larger number of species, simple (n. 9-24), but, 

 in a few, bi-quadri-locular (n. 25-27), or they occur elongated and 

 needle-shaped, and 4-plurilocular (n. 28-30), or very large and 

 simple (n. 31, 32). Spermatia in the larger part long and bowed; 

 but short, and straight in n. 19, 20, and 28 ; as in n. 31 and 32. 



f Spores ellipsoid, simple. 



9. L. pallida (Schreb.) Scha3r.; thallus thin, membranace- 

 ous-cartilagineous, smoothish; cream-coloured and darkening; 

 apothecia sessile, tumid ; whitish-buflf, white pruinose, the thin, 



very entire margin disappearing. Spores ellipsoid, -^ mic. 



Parmelia, Scliar. Spicil. p. 396. L. albella, Auctt. 



