The Bristol Foray. 133 



Stemonitis fusca Roth., B. 



Comatricha nigra Schroet. and var. alta Lister, B., C. 



Brefeldia maxima Rost., B. 



Dictj-diaethalium plumbeum Rost., B., C. 



Reticularia Lycoperdon Bull., A., B., C. 



Liceopsis lobata Torrend, B. 



Lycogala epidendmm Fr., A., B., C. 



Trichia affinis de Ban-, C, persimilis Karst., A., B., C, varia Pers., A., C, 



decipiens Macbr., A., B., C, Botrytis Pers., C. 

 Hemitrichia clavata Rost., B. 

 Arc}Tia incamata Pers., B., C. 

 Margarita metallica Lister, B. 



THE LICHENS OF THE BRISTOL FORAY. 



By ir. Watson, DSc, A.L.S. 



Two of the excursions were to localities where the substratum 

 was mainly a calcareous one. In both localities a number of 

 rock-surfaces were exposed and therefore a fairly large number 

 of calcicolous lichens were noticed. The cliffs, rock-ledges and 

 screes of Cleeve Combe were especially interesting, and yielded 

 a nimiber of Hchens characteristic of such habitats. On the 

 Warren above the Combe some leaching had occurred and many 

 ground Hchens, more representative of a siliceous district, were 

 present. The only known British locality for Lecidea testacea is 

 near Cleeve Combe, but the exact spot, where it is still abundant, 

 was not \'isited. Cleeve Combe is also one of the two British 

 localities from which Leptogiiim placodiellum is recorded. It is 

 abundant on the talus but very seldom merits N^dander's specific 

 name of placodiellum, the thallus rareh' shoxWng the radiate 

 lobes distincth*, so that Krempelhuber's specific name of dif- 

 fradum is more appropriate. A number of lichens [e.g. Collema 

 flaccid urn, Thelotrema lepadinum, Urceolaria gypsacea, Lecidea 

 Metzleri, Biatorina Candida), which have been pre\'iously seen 

 in the Combe, are not given in the list as they were not observed 

 during our hurried survev. The corticolous Hchens were more 

 abundant in the Cleeve district than in the Bristol area, smoke 

 ha\ing its usual effect on them. Blaise Castle ^^'oods were 

 rather poor for Hchens, the}- were too damp and the shading 

 was too great. This locality is in Gloucestershire, the other two 

 are in Somersetshire. In none of the localities \'isited was an 

 altitude greater than 550 fee;t reached. 



^ = Ashton Court. B = Blaise Castle. C = Cleeve Combe, ir. =Wrington and 

 Wrington Warren. 



Calicium h}-perellum Ach., B., W. Collema pulposum (Bemh.) Ach., B., 



Sphinctrina turbinata (Pers.) Fr., C. C. 



Placynthium nigrum (Huds.) Gray, C. tenax (Sw.) Ach., A. 



A., C, W. C. cheileum Ach., A. 



