158 NEW LICHENS. 
tata, minutissime granulata, granulis convexiusculis, ru- 
gosis, demum erumpentibus ; apotheciis convexis, immar- 
ginatis, pruina alba crassa tectis, disco carneo. 
Has. On bark; Brazil; Hook. Aerb.—' Thallus about two 
inches wide, whitish ash-coloured, not altered by moisture; 
- but the discs of the apothecia when wetted assume a 
deeper colour. The surface of the thallus is minutely | 
wrinkled or covered with contiguous flattish granules, 
which sometimes bursting at their tops, emit buds in the 
form of a whitish powder. Apothecia of the size of poppy 
seeds, at first covered with a coarse white powder. 
URCEOLARIA, Ach. 
1. U. citrina, Tayl. ; hypothallo atro; tliallo citrino, squamis | 
subrotundis, compressis, sublobatis, minutis ; apotheciis - 
immersis, punctiformibus, angulatis, pallidioribus, immar- 
_ gimatis, sub confluentibus. 
Has. On rocks, Swan River; Mr: James Drummond. — 
Patches of crowded scales several inches wide : the black 
 tertareous substratum rising up in the interstices of the 
scales. In most respects allied to U. Acharii, Ach.; but 
the colour is that of Lecanora citrina, Ach. Apothecia, soli- 
tary or two together, contorted, occur on each fertile s 
2. U. tessellata, Tayl.; hypothallo atro, sparso, crusta ri 
Se er rubella, areolis planis, levibus, 
oe e rl ne | The areoke ma 
= pee crowded. flattish warts; whose margins v 
re "fus Anh coast pa of the ap 
not pa beneath the lamina. Differs : 
dise ses of the = pote bane 
