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



Such is the normal state of the apothecia, but by age they 

 become much larger, the pore gradually expanding into the 

 appearance of a small disc and minutely granulated, the margin 

 of the perithecium forming an elevated border ; but in this state 

 I have not been able to find any sporidia in the asci, nor is the 

 nucleus changed by moisture, as it is in the young state, but 

 remains black ; in some of the asci, in those apothecia which 

 are not so fully expanded, T have found sporidia, and they are 

 of a darker colour with the margin and septa brownish. 



It is probable that the old state of the apothecia, as above 

 described, was the reason why Sir J. Smith considered his plant 

 an Urceolaria, and allied it to U. Acharii, to which they have 

 a great resemblance ; and it may have been also the reason why 

 Fries was so doubtful respecting it (see Lich. Europ. p. 193). 

 I have ventured to keep the name of V. Gagei for the above 

 reasons; but in Leighton's Brit. Angio. Lich. p. 63, he says 

 that "the specimens of V. Gagei, Borr., and V. Harrimanni, 

 Ach., in herb. Borr., showed only on section a black, flat perithe- 

 cium, with a roundish-yellow spot underneath, no trace of asci 

 or sporidia being discernible .'' 



The sporidia resemble those of V. prenophora, Ach. (see Leight. 

 Brit. Angio. Lich. p. 54. tab. 23), but the apothecia are very 

 much smaller and of a different shape, and the perithecium is 

 entire and not dimidiate as in that species. 



V. Harrimanni, Ach. (Plate III. fig. 9.) 



Thallus crustaceous, thin, mouse-coloured, continuous, termi- 

 nated by a narrow black margin, the sux'face minutely dotted 

 and powdery-looking; apothecia minute, black, immersed, the 

 apex prominent ; pore at length widely umbilicated ; perithecium 

 dimidiate, very short; nucleus pale brown, in a pale tunic; 

 sporidia ovate, single-celled, colourless. 



Verrucaria Harrimanni, Ach. Univ. 284. Syn. 93 ; Hook. 



Brit. El. ii. 153; Leight. Brit. Angio. Lich. 63; Schser. 



Lich. Enum. 216. 

 Verrucaria rupestris, b. Fries, Lich. Europ. 437. 



Thallus crustaceous, thin, spreading in in*egular-shaped small 

 patches, terminating with a narrow black margin ; the surface 

 gray with a reddish hue, minutely dotted and powdery-looking 

 when seen through a magnifying power ; beneath the outer coat 

 is a green granular layer upon a white substratum. Apothecia 

 minute, scarcely visible to the naked eye, scattered, immersed ; 

 the apex black, slightly protruded, hemispherical or flattish ; 

 pore at first very minute, becoming open and umbilicated. Peri- 

 thecium dimidiate, slightly immersed at the base. Nucleus pale 



