Dr. Deakiu on new species of Yerrucaria and Sagedia. 37 



hemispherical, immersed, becoming half-protruded, depressed at 

 the top ; pore minute, rarely umbilicated ; perithecium entire ; 

 nucleus pale brown or white ; sporidia elliptical, single-celled, 

 pale yellow. 



Vemicaria plumbea, Ach. Lieh. Univ. 285. Syn. 93 ; Fries, 

 Lich. Europ. p. 438 ; Hook. Brit. Fl. ii. 153 ; Tayl. Fl. Hib. 

 pt. 2. p. 91 ; Bohl. Lich. Brit. pi. 81. 



Verrucaria c<fn</e<7, DeCand. Fl. Franc, ii. 318 j Schser. Lich. 

 Enum. 216. Exs. 102. 



Lichen plumhosus, Sm. Eng. Bot. 2540. 



Thallus crustaceous, rather thin, in irregular-shaped patches, 

 terminated by a somewhat thickened black margin, the surface 

 even or slightly rugged, of a bluish lead-colour, becoming in an 

 old state darker and often brownish, cracked into small angular 

 areolae ; beneath the outer coat is a green granular layer upon a 

 white substratum. Apothecia numerous, scattered, one, sometimes 

 two, in an areola, small, black, immersed in the thallus, becoming 

 half-protruded, hemispherical, at length depressed, and a section 

 shows them to be almost square ; pore minute, occasionally 

 becoming open and umbihcated. Perilhecium entii-e. Nucleus 

 white or pale bro^vTi, hyahne when moist. Sporidia in asci 

 eight, elliptic ovate, single-celled, pale yellow, sometimes gra- 

 nulated. 



Hab. Limestone rocks in various parts of Europe. 



V. Gagei ? Borr. (Plate IIL fig. 10.) 



Thallus crustaceous, thin, indeterminate, a dull gray or brown- 

 ish-white, uneven, cracked into angular areolae ; apothecia minute, 

 black, half-immersed, globose, becoming much larger, open and 

 patelliform ; perithecium entire ; nucleus pale brown ; sporidia 

 oblong-ovate, four-celled, colourless. 



Lichen Gagei, Sm. Eng. Bot. 2580. 

 Verrucaria Gagei, Borr. Hook. Eng. Fl. ii. 153. 



Thallus thin, spreading in irregular-shaped indeterminate 

 patches, whitish-gray, and generally with a brownish hue, cracked 

 into small angular areola?, the surface more or less uneven, not 

 powdery ; beneath the outer coat is a green granular layer upon 

 a white substratum. Apothecia numerous, scattered, very minute, 

 scarcely visible to the naked eye, black and pohshed, half-pro- 

 truded, with an indistinct pore, globose or oblong. Perithecium 

 thin, entire. Nucleus black when dry, but pale brown and hya- 

 line when moist. Sporidia in asci 'eight, oblong-ovate, four- 

 celled, with the septa colourless. 



Hab. Sandstone rocks near Florence, Italy. 



