112 Twenty-fifth Report on the State Museum. 



brown ; spores somewhat irregular, .OOl'-.OOlS' long, .0006'-.0007 

 broad. 



Leaves of Clintonia horealis. Adirondack Mts. July to Sep- 

 tember. 



The sori normally occur on the upper surface of the leaf, but 

 there are usually a few on the lower surface. I have seen no 

 description of this species, and depend upon the authentication of 

 my specimens by Rev. M. A. Curtis for the correctness of their 

 reference. 



3. P. YioLAEUM Lh. Violet Brand. 



Hypogenous ; spots yellowish ; sori small or minute, clustered or 

 scattered, at first covered by the epidermis, then surrounded by its 

 ruptured remains, brown ; spores broadly elliptical, .00r-.0013' 

 long, .0008'-.0009' broad. 



Leaves of violets. Common. July to September. 



A form with the sori minute and scattered over the whole under 

 surface of the leaves occurs on Yiola pubescens. The IJredo form 

 of this species is Trichohasis Yiolarum Lev. 



4. P. Mykehis Sohw. 



Amphigenous ; spots pallid or yellowish, sometimes none ; sori 

 small, scattered or loosely clustered, blackish-brown ; spores broadly 

 elliptical, .001'-.0013' long, .0008' broad. 



Leaves of sweet cicely, Osmorrhiza hrevistylis and 0. longistylis. 



Our specimens do not agree strictly with the perplexingly brief 

 description of Schweinitz, but they can scarcely be more than a 

 mere variety, differing in the color of the spores and sometimes in 

 the presence of spots on the leaves. The species is very close to 

 the next, differing chiefly in the smaller size of the spores, a dif- 

 ference which extends also to the Uredo form. 



6. P. Umbellifeeaeum DC. 



Amphigenous ; spots none ; sori small, scattered, dark-brown ; 

 spores somewhat irregular, slightly constricted, sometimes narrowed 

 toward the base, .0013'-.0016' long, .0008' broad. 



ljQ?iYe^ oi Archangelica atropurpurea. North Greenbush. July 

 to September. 



The dull color of the sori causes the leaf to appear as if mottled 

 with numerous small areas of dead tissue. The spores in our spe- 

 cimens agree exactly with those of European specimens. Tricho- 

 hasis Tlmhellatariim Lev. is the Uredo form. 



6. P. vAEiABiLis Grev. Variable Brand. 



Amphigenous; spots none; sori small, scattered, subrotund, 

 surrounded by the ruptured epidermis, blackish-brown ; spores 



