ИТЕ NE 
THE LICHENs OF SOUTH LANCASHIRE. 111 
PHYSCIACE. 
XANTHORIA PARIETINA, Th. Fr. On walls, rocks, and (rarely) on the bark of 
trees. Very common, and fruiting well, on limestone in the Ribble 
Valley, but rare in other parts of the vice-county on siliceous rocks and 
masonry. The rarity in the greater part of our district of this common 
lichen is remarkable, and its scarcity on any but limestone rock seems 
good evidence of the favourable influence of a calcareous substratum on 
lichen-growth in our area. 
f. CINERASCENS, Leight. With the type, and very distinct from it, 
near Downham, June 1908, А. Wilson; on an old wall at the golf-links, 
Law Farm near Colne, 1910, М. Robinson ! 
Var. ЕСТАХЕА, Nyl. Опа limestone gate-post in a lane leading from 
Worston to Downham, March 1913. 
XANTHORIA POLYCARPA, Fisch.-Benz. 
Sparingly, on tree-stumps on the shore, Banks, May 1901. 
XANTHORIA LYCHNEA, Th. Fr. 
In a sterile coudition, on a limestone wall near the В. Ribble, Low 
Moor, Clitheroe, June 1914, C. B. Travis ў W. а. T. 
PHYSCIA PULVERULENTA, Nyl. Оп tree-trunks. Very rare, and always 
poorly developed. 
Littleborough, herb. Molineux (17) (specimen not seen by us), 
doubtless now extinct in that locality ; Kirkby, Vict. Hist. Lanes. p. 84 ; 
on an ash-tree near Chatburn Station, 1907. 
Puyscia PrrvREA, Nyl. Very rare and rupestral only. Sterile. 
Amongst moss on the horizontal surface of gritstone coping of a culvert 
„near Longton, Dec. 26, 1911. 
PHYSCIA STELLARIS, Nyl., var. LEPTALEA, Nyl. Contrary to its usual habit, 
rupestral only in South Laneashire. Sterile, and depauperate. 
Kirkby, Viet. Hist. Lanes. p. 84; rather common on limestone walls 
and gate-posts about Chatburn and Downham. 
Payscta TENELLA, Nyl. On rocks and walls, and (once only) on bark. 
Rare. Sterile. 
(Moseley Vale) F. P. Marrat, Hep. & Lichens of Lpool; “on 
ferrugineous rocks, Cliviger,? Fl. Todmorden; limestone walls, Chat- 
burn, Downham, and near Twiston ; on the bark of a tree near Smithies 
Bridge, Chatburn, March 1913. 
