Josselyn Botanical Society 



17 



against the tree trunk, there was another rock of the same 

 material entirely destitute of the lichen. Another example 

 of the distribution of lichens by water currents was once 

 observed in the finding on the naked rocks of one of our hill- 

 sides of Gyrophora grisea. The colony of Gyrophora was 

 along a depression in the ledges down which water found its 

 way in times of rain. The plant was distributed along this 

 water way for a limited distance, and was to be found 

 nowhere else on the hill. It may be mentioned that there is 

 no other known station for Gyrophora grisea in eastern 

 America. 



At the base of our elm, visible on all sides, were some 

 magnificent specimens of Lobaria amplissima. It is doubtful 

 if another specimen of the species is to be found nearer than 

 a mile in distance, and its presence where found is a matter 

 of much interest. The specimens were without apothecia 

 and were greatly deformed by parasitic fungi. That the 

 spread of the plant on this particular tree must be purely 

 vegetative is entirely obvious. 



Another lichen, Leptogium tremelloides ', was found on 

 the tree near its base. The specimens were unfruited, and 

 while the species is vastly more common than the preceding, 

 it is difficult to account for its occurrence on an isolated tree. 

 The only lichen found on the tree with abundantly developed 

 apothecia was Par me Ha rudecta y and it was very luxuriant. 

 The specimens were densely isidiose and afforded the normal 

 reaction with calcium hypochlorite. The species is seldom 

 found with apothecia in Knox County, and then usually in 

 shaded situations. Parmelia sulcata was found infertile and 

 appearing as if crowded. The species is very impatient of 

 companionship and only to be found in its best development 

 when in a somewhat isolated relationship with other lichens. 



Physcia pulverulenta leucoleiptes was an inconspicuous 

 denizen of the tree, but was found in a great number of indi- 

 viduals. I do not remember ever to have collected this spe- 

 cies bearing apothecia, but in its best state, growing free from 

 entangling alliances, it is a rarely beautiful thing. In Amer- 

 ica, where it was first detected, it exhibits great variability, 

 but we have never dreamed of making sub-forms of its vary- 

 ing phases. It has remained for a French lichenist, who dis- 



