OBSKRVATIONS ON ARIZONA FUNGI. I 5 



arid portions of the territory during the dry seasons at 

 least, it certainly cannot be said of the mountain regions, par- 

 ticularly of the Chiricahuas with which I am familiar, since 

 without giv'ng particular attention to the fungi, I collected 

 during the months of July and August, 1907, nearly 100 

 species, and in one hour in August over 59 distinct forms. 

 The validity of this thesis will appear from the following 

 general account of some of the most striking of the fungi 

 whose names unfortunately cannot be given as the plants 

 have not as yet been completely worked up. 



Mildews were found on SoUdago and Anoda; a bluish- 

 gray fungus was found abundantly on Erodiiim cicutarium. 

 In one case a shelf-fungus was found attached to a living and 

 apparently healthy specimen of the semi-desert Oiierciis em- 

 oryi. On another oak (O. arizonica) a remarkable globu- 

 lar mass was observed which was over 15 cm. in length. 

 The surface of this fungus was made up of cylindrical projec- 

 tions with colored tips ; it was whitish beneath and toward the 

 upper surface brown, while a pinkish color ranged midway. 

 The same species of oak, and Q. gambelii also, each supported 

 two more fungi belonging to the Poly poms type. In addi- 

 tion to the abov^e shelf fungi were found also on living 

 specimens of the ash {Fraxiuus .^), sycamore {Platanus 

 Wrightii) ^ locust {Robinia neo-mexicana) ^ and manzanita 

 {Arctostaphylos pungens). 



A rust was very conspicuous in the fall of 1906 on a 

 small rosaceous shrub, and a fungus, black when mature, 

 infested a species of Cylindropuntia. Leaf spots appeared on 

 many plants of which none were more interesting than those 

 which infested the leaves of the mistletoe {Phoradendron 

 flavescens) which was parasitic on the walnut {Jiiglans rupes- 

 tris) . The case of a mushroom parasitic on another mush- 

 room, to which attention has been called recently by Profes- 

 sor Atkinson,* was looked for but was not found. In all 23 



*A mushroom parasitic on another mushroom, Plant World, 10: 121, 

 1907. 



