Dr. Deakin on new species of Verrucaria and Sagedia. 35 



narrow, black, often indistinct margin ; the surface a dull dark 

 brownish-olive, even and smooth, more or less cracked into 

 angular areolae, which are not visible when the plant is moist- 

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

 white substratum. Apothecia immersed in the thallus, which 

 swells about its base; the apex at length becomes naked, 

 and more or less prominent, sometimes conical, but afterwards 

 depressed or flattened ; pore minute. Perithecium thick, clumsy- 

 looking, and often so swollen and spreading at the base as to 

 appear to entirely envelope the nucleus, but upon careful exami- 

 nation it is found wanting at the base, and the nucleus only 

 separated from the stone by a thin black tunic. Nucleus black, 

 becoming white and hyaline when moistened. Sporidia in asci 

 eight, ovate, single- celled, pale yellow, granulated or clouded 

 from the contained sporules. 



Hab. Calcareous rocks near the sea, Torquay, Devonshire. 



V.fugax. (Plate II. fig. 5.) 



Thallus crustaceous, very thin, continuous or scattered, mi- 

 nutely scaly, fugacious, greenish-olive ; apothecia minute, scat- 

 tered, hemispherical, glossy black ; pore minute, becoming um- 

 bilicated, large and open ; perithecium dimidiate, incurved at the 

 base; nucleus pale brown, in a pale tunic; sporidia ovate, 

 single-celled, pale yellow. 



Thallus crustaceous, very thin, spreading in indeterminate 

 patches, continuous, or sometimes here and there cracked into 

 minute areolae, apparently soon falling away, leaving a few scat- 

 tered scales especially about the apothecia, and then pulverulent ; 

 it is of a dull brownish-gray when dry, olive-green when moist ; 

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

 substratum. Apothecia numerous, scattered, minute, hemisphe- 

 rical, prominent, glossy black, the base only immersed in the 

 thallus ; pore minute, becoming umbilicated, at length open, the 

 top falling awayj leaving the remains, a minute ring. Perithecium 

 dimidiate, incurved at the base, and enveloping the nucleus 

 except a small space at the bottom. Nucleus pale brown, white 

 and hyaline when moist ; tunic pale. Sporidia in asci eight, 

 ovate, pale yellow, single-celled, often clouded from the con- 

 tained sporules. 



Hab. Calcareous rocks, Torquay, Devonshire. 



V. perminuta. (Plate II. fig. 6.) 



Thallus dark olive- green, thin, indeterminate, continuous, 

 uneven, rugose and warty ; apothecia scattered or crowded, mi- 

 nute, prominent, brownish-black, globoso-hemispherical ; pore 

 minute ; perithecium dimidiate, incurved at the base ; nucleus 



3* 



