16 



from both in the less blackened extremities. Future obser- 

 vations may induce us to unite the two species now described, 

 together with U. melaxantha^ thus giving a further proof of 

 the extensive range of country occupied by the same species 

 among the lower orders of the vegetable creation. 



^ 



jF/g. 1. 1. Plants {nat. size). Fig. 2. Stem and branches; and Fig. 3. 



Portion of a stem with a soredium : — magnified. 



