36 Dr. Deakin on new species of Verrucaria and Sagedia. 



white, in a thin black tunic ; sporidia fusiform, six-celled, pale 

 yellow. 



Thallus thin, in unequal-sized indeterminate patches of a dark 

 olive-green, unchanged by moisture, sometimes of a brownish 

 hue, uneven and somewhat warty, but smooth, not polished ; 

 beneath the outer coat is a green granular layer upon a white 

 substratum. Apothecia scattered, sometimes several are crowded 

 together, very small, scarcely visible to the naked eye, promi- 

 nent, globose or hemispherical, black with a brownish hue, some- 

 times glossy. Perithecium dimidiate, incurved at the base, the 

 pore very minute, often not visible, but in an old state it becomes 

 large and open. Nucleus white, in a very thin black tunic. 

 Sporidia in asci eight, fusiform, tapering at each end, pale yel- 

 low, six-celled, with five septa. 



Hab. Rocks near the sea, Torquay, Devonshire. 



Notwithstanding the close affinity in the general appearance 

 and the structure of the thallus and apothecia with V. trachona, 

 Tayl., the sporidia are very distinctly diiferent ; they are more 

 tapering at the extremities, and have six cells and five septa, 

 while in V, trachona, Tayl., they are obtusely pointed at the 

 ^;?dir)Qfl|uties^ have four cells and three septa. 



V. viridis. (Plate III. fig. 7.) 



Thallus crustaceous, very thin, grayish-green, cracked into 

 angular areolae, indeterminate ; apothecia small, scattered, black, 

 at length depressed and umbilicated; perithecium prominent, 

 dimidiate, neither incurved nor spreading at the base ; nucleus 

 white, in a pale tunic; sporidia elliptical, two-celled, yellow, 

 granulated. 



Thallus crustaceous, very thin, spreading in indeterminate 

 patches of a dull grayish-green, becoming yellowish- green when 

 moist and somewhat gelatinous, cracked when diy into an- 

 gular areolse, the internal substance scattered throughout with 

 green granules. Apothecia minute, black, prominent, scattered, 

 hemispherical, becoming depressed, and the minute pore widely 

 umbilicated. Perithecium dimidiate, short, neither incurved nor 

 spreading at the base. Nucleus white, and hyaline when moist. 

 Sporidia in asci eight, elliptical, two-celled, yellow, and granu- 

 lated with the ultimate sporules. 



Hab. Red Sandstone rocks, Torquay, Devonshire. 



The three following species, though not new, have not been, 

 I think, fully illustrated. 



V. plumheaj Ac\i. (Plate III. fig. 8.) 



Thallus crustaceous, lead colour, terminated by a black margin 

 cracked into small angular areolae ; apothecia small, black, sub- 



