266 BOTANY OF PERTH. [November, 



the Sidlaw range. I have not once found it here in fructifica- 

 tion however. The varieties florida, ceratina, plicata, and dasy- 

 poga, seem to graduate into each other, and to be frequently in- 

 distinguishable ; it is often granulose-pulverulent or roughened 

 by soredic wartlets. This and many other species lose their 

 greenish tint, and acquire a yellowish, reddish, or brownish co- 

 lour in the herbarium. 



Cornicularia jubata is very plentiful in the same wood, and 

 associated with the preceding species ; var. prolixa is most fre- 

 quent ; var. chalybeiformis I have found on boulders and rocks 

 on Birnam Hill, one of the outliers of the Dunkeld Alps. I 

 have not met with the grey- coloured variety^ nor have I found 

 this species in fruit in this neighbourhood. 



Ramalina farinacea is abundant on roadside hedges, and on 

 trees in the hill-woods so common in this neighbourhood. It is 

 usually associated \nt\\ varieties of R. fraxinea, especially var. 

 fastigiata and calicaris. Schserer constitutes it into a distinct 

 species, but I am inclined, with Fries, to regard all the British 

 Ramalinas as varieties of a single species. R. fraxinea : I have 

 never seen this species in fruit, and believe it to be a sorediiferous 

 or sterile form of R. fraxinea, var. calicaris. R. fraxinea, espe- 

 cially its varieties above mentioned {fastigiata and calicaris) are 

 also common in the same habitats. I have frequently noticed, 

 on the same hedge, transition forms between these and R. fari- 

 nacea. Var. ampliata is common on trees of various kinds on 

 the banks of the Tay, above its junction with the Almond, and 

 in the grounds of various noblemen's residences in the district. 

 R. scopulorwn is a peculiar saxicolous species, having a rigid, 

 cartilaginous thallus^ the extremities of the thalline segments 

 being frequently roughened or tuberculated by the spermogones 

 of the plant. It grows chiefly on seacoasts, and attains consi- 

 derable size and thickness on the rocky coast- of Forfarshire. 

 Dwarf specimens are common on the rocky summit of Kinnoull 

 Hill. I have not found it in fruit in this district. 



Physcia furfur acea is common on trees in the hill- woods above 

 Muirhall and Kinfauns. It is seldom fertile, or much covered 

 by a furfuraceous or isidioid efiiorescence. P. prunastri is abun- 

 dant in the same woods. In fructification it is sometimes dwarfed, 

 deformed, and very sorediiferous. This condition I have found 

 most fully developed in specimens gathered in the wood around 



