118 MESSRS. J. А. WHELDON AND W. б. TRAVIS ON 
ACAROSPORA SIMPLEX, Jatta. 
On gritstone masonry of a canal-bridge, Aintree, Nov. 1905; the 
f. complicata, Cromb., in the same place, Oct. 1910; abundant and 
fruiting freely, on the faces of gritstone blocks in the masonry by the 
В. Alt by the main road between Aintree and Maghull, Oct. 1910 ; very 
common on sandstone copings of walls about Birkdale and Southport. 
PERTUSARIACE. 
PERTUSARIA AMARA, Nyl. 
Tree-trunks. Only known with us to occur sparingly, and in a 
poorly developed and sterile condition, in a few localities in the Ribble 
Valley area in the neighbourhood of Clitheroe and Chatburn. One of 
the few common corticole lichens which still linger in the least smoke- 
affected part of South Lancashire. 
PERTUSARIA COMMUNIS, DC. Tree-trunks. Very rare. 
On the bark of an elm by the R. Ribble near Clitheroe, June 1912 ; 
also observed on ash in the same neighbourhood, occurring along with 
Lecanora varia and Parmelia sulcata, and the moss Dieranoweisia cirrata. 
PERTUSARIA LEIOPLACA, Schaer. 
On the bark of a holly-tree in a hedge near Downham, June 1914, 
C. В. Travis  W. G. T. 
PERTUSARIA DEALBATA, Nyl. ex Cromb. On gritstone rocks. Very rare and 
sterile. 
In a discoloured and degenerate state on stones, Green's Clough, near 
Todmorden, May 1912; on gritstone walls, Whalley Nab, and other 
places about Whalley, March 1913 ; on sandstone walls, Rivington 
Pike, June 1914. 
THELOTREMA CEA. 
URCEOLARIA SCRUPOSA, Ach. Very rare. 
Rainford, Vict. Hist. p. 84; Clitheroe, 1906 ; on shady, limestone 
rocks, Worsaw Hill, Chatburn, May 1910. 
GY ROPHORACE. 
GYROPHORA POLYPHYLLA, Turn. et Borr. Very rare. Sterile. 
Occurs very sparingly, and in a depauperate state, on sloping rock- 
faces of Millstone Grit, Noyna, near Colne, alt. circa 950 ft., May 1913, 
H. Robinson, C. B. Travis, and W. G. T. The specimens were 
extremely stunted, and probably represent the last survivors in the 
vice-county of a species which, formerly, must have occurred on all the 
gritstone rocks on the summits of our higher hills. 
