LICHEN COMMUNITIES 



375 



It will only be possible to give a few typical associations from the many 

 that have been published. Crustaceous forms are the most abundant. 

 On granite and on quartzite not disintegrated Malinowski' listed : 



Acarospora chlorophana. Lecidea tumida. 



Lecanora glaucoma. Biatorella sporostatia. 



Rhizocarpon viridiatrum. Biatorella testudinea. 



On granite and quartzite disintegrated : 



Aspicilia cinerea. 



Aspicilia gibbosa. 



Aspicilia tenebrosa. 



Buellia coracina. 



Catillaria {Biatorina) Hochstetteri. 



Rhizocarpon petraeum. 



Rhizocarpon geographicum vars. 



Biatorella cinerea. 



Lecatiora badia. 

 Lecanora cenisia. 

 Lecidea confiuens. 

 Lecidea fuscoatra. 

 Lecidea platycarpa. 

 Lecidea lapicida. 

 Haematomma ventosum. 



On these disintegrated rocks there is a constant struggle for existence 

 between the various species ; the victorious association finally consists of 

 Lecanora badia, L. cenisia and Lecidea confluens with occasional growths of 

 the following species : 



Aspicilia cinerea. Biatorella cinerea. 



Haematomma ventosum. Lecidea platycarpa. 



Rhizocarpon geographicum vars. 



A number of rock associations have been tabulated by Wheldon and 

 Wilson^ for Perthshire. Among others they give some of the most typical 

 lichens on granitic and eruptive rocks : 



Sphaerophorus coralloides. 

 Sphaerophorus fragilis. 

 Platysma Fahlunense. 

 Platysma commixtutn. 

 Platysma glaucwn. 

 Platysma lacunosum. 

 Parinelia saxatilis. 

 Parmelia omphalodes. 

 Parmelia Mougeotii. 

 Parmelia stygia. 

 Parmelia tristis. 

 Parmelia lanata. 

 Gyrophora proboscidea. 

 Gyrophora cylindrica. 

 Gyrophora torrefacta. 

 Gyrophora polyphylla. 



Gyrophora Jlocculosa. 

 Lecanora gelida. 

 Lecanora atra. 

 Lecanora badia. 

 Lecanora tartarea. 

 Lecanora parella. 

 Lecanora ventosa. 

 Lecanora Dicksonii. 

 Lecanora cinerea. 

 Lecanora peliocypha. 

 Pertusaria dealbata. 

 Stereocaulon Delisei. 

 Stereocaulon evolutum. 

 Stereocaulon coralloides. 

 Stereocaulon denudatum. 

 Psorotichia lugubris. 



Lecidea inserena. 

 Lecidea panaeola. 

 Lecidea contigiia. 

 Lecidea confiuens. 

 Lecidea lapicida. 

 Lecidea plana. 

 Lecidea mesotropa. 

 Lecidea auriculaia. 

 Lecidea diducens. 

 Lecidea aglaea. 

 Lecidea rivulosa. 

 Lecidea Kochiana. 

 Lecidea pycnocarpa. 

 Buellia atrata. 

 Rhizocarpon Oederi. 



On siliceous rocks in West Lancashire the same authors^ depict the 

 lichen flora as follows: "There are many grey Parmeliae and Cladoniae 



' Malinowski 1911. ^ Wheldon and Wilson 1915. ^ Wheldon and Wilson 1907. 



