78 LICHENES. [Baomyces. 



varies in thickness, is sometimes split and areolate. On the same 

 stipes three or four apothecia are sometimes borne ; the stipes is 

 at times exceedingly short, and the crust more of an ash colour, 

 constituting the var. termed roscidum by Acharius. 



2. C. sparocephalum, ACH. Thallus filmy, very thin, grey- 

 ish ; apothecia turbinate, at length subglobose, of a rusty brown, 

 the stipes elongate. Ach. Meth. Lich. p. 91. C. claviculare, 8. 

 spharocepkalum, Ach. L. Un. p. 235. Eng. Bot. t. 414. 



On decaying timber ; at Powerscourt, Dr. Whitley Stokes. This 

 species is often associated with Lecanora varia. 



4. BJEOMYCES. Pers. 



Thallus crustaceous or filmy, uniform, sometimes lobed ; apothe- 

 cia convex or orbiculate, terminal on solid, simple, soft foot- 

 stalks, not bordered. 



1. B. rupestris, PERS. Thallus crustaceous, wrinkled by gra- 

 nulations, pulverulent, of a light greenish ash, sometimes light 

 brown colour ; stipes short, somewhat compressed ; apothecia 

 convex, reddish brown. Pers. ap. Uster. in ann. d. Bot. St. 7, p. 

 19. Ach. L. Un. p. 573. Eng. Bot. t. 373. 



On stones and on the ground ; common. 



2. B. microcephalus. Thallus filmy, continuous, greyish- 

 white, the border greenish ; apothecia numerous, minute, nearly 

 globose, reddish brown, nearly black when dry ; stipes very 

 short, pellucid. 



On the surface of Hypnum myosuroides, on Carig mountain, 

 County of Kerry : also on Jungermannia dilatata. The patches, 

 rather orbicular, are from one to six inches in diameter, conspicuous as 

 white spots at some distance. When the thallus is moistened the 

 greenish parenchyma is here and there apparent in points. The sur- 

 face is uneven from most minute wrinkles. Apothecia minute, barely 

 observable with the naked eye, when young almost sessile, of a light 

 reddish brown, translucent and shining even in the dry state, when old 

 and dry they are nearly opaque and black, sometimes two on the same 

 stipes, globose. The stipes is scarcely two diameters of the apothe- 

 cium in length, strangulated in the middle, the upper portion more 

 brown, the lower paler. It has no affinity with any described species 

 with which I am acquainted. The patch at a little distance is very 

 like that of Lecidea vernalis, when this occurs investing mosses, but 

 the presence of the stipes and structure of the apothecia, widely dif- 

 ferent, remove all chance of confusion. 



3. B. furfuraceus. Thallus filmy, investing, whitish; buds 

 covering the entire surface as a greenish yellow powder ; apo- 

 thecia at length subglobose, brown, imrnarginate ; the disk dark 

 brown ; lamina proligera thick, nearly colourless. Calicium 

 furfur aceum. Pers. Tent. Disp. Fung. Supp. p. 60, Cal. Capitella- 

 tum Ack. L. Un. p. 241. Trichia furfuracea Wither. Arr. Mucor 

 furfuraceus, Linn. 



On sandy clay, near Belfast, Mr. Templeton. The apothecia at 



