Dr. Deakin on new species of Verrucaria and Sagedia. 39 



yellowish- brown, hyaline when moistened, in a pale indistinct 

 tunic. Sporidia in asci eight, ovate, very minute, single-celled, 

 colourless. 



Hab. Limestone rocks near Torquay, Devonshire. 



Sagedia, Ach. (in part), Fries. 



Apothecia enclosed within the thallus, globose or obovate. 

 Nucleus gelatinous, deliquescing. Perithecium membranaceous, at 

 length becoming black. Pore distinct, attenuated into a slender 

 neck, dilated at the apex, perforated. Thallus horizontal, sub- 

 crustaceous or crustaceous. 



>S^. ampullacea. (Plate IV. fig. 11.) 



Thallus crustaceous, thin, indeterminate, greenish-gray, cracked 

 into angular areolae, slightly powdery on the surface, pale green 

 when moist; apothecia numerous, scattered, immersed, black, 

 ampullaform, the apex hemispherical, slightly protruded ; peri- 

 thecium entire; nucleus white; sporidia irregularly ovate or 

 elliptical, large, granulated, single-celled, pale yellow. 



Thallus spreading in large indeterminate patches of a greenish- 

 gray, cracked into unequal- sized, variable- shaped, angular areolae, 

 the surface when magnified having a powdery or minutely warty 

 appearance ; when moistened it becomes of a bright yellowish- 

 green, and somewhat gelatinous-looking ; beneath the outer coat 

 is a green granular layer upon a white substratum. Apothecia 

 numerous, scattered, immersed in the thallus, and forming a 

 cavity in the mortar beneath it, of a medium size and ampulla- 

 form shape ; the apex small, hemispherical, slightly protruded, 

 black, with a depressed central pore slightly thickened at the 

 top of the constricted neck. Perithecium thickish, entire, tough, 

 black. Nucleus white, hyaline when moist, in a pale thin tunic, 

 scarcely visible. Sporidia in asci eight, large^ ovate, oblong, 

 obovate or elliptical, single-celled, pale yellow, granulated. 



Hab. Growing on the plaster of an old gate-post near Ilsham, 

 Torquay, Devonshire. 



S. calcarea. (Plate IV. fig. 12.) 



Thallus crustaceous, thin, hardy continuous, indeterminate, 

 pinkish-gray, dusty-looking on the surface; apothecia small, 

 entirely immersed, the apex naked, globose, contracted into a 

 narrow neck; perithecium entire; pore slightly umbilicated; 

 nucleus dark brown; sporidia brownish-yellow, large, oblong, 

 two-celled, granulated, contracted in the middle. 



Thallus spreading in large indeterminate patches, hard and 

 stone-like, continuous; the surface smooth, even, and when seen 

 through a magnifying glass appearing dusty, of a pale pinkish- 



