104 TWENTY-SEVENTH REPORT ON THE STATE MUSEUM. 



It seems to prevent the development of the annoying 



spikes of spiny involucres of the grass. If this be really 



the case the fungus ought to be classed among the useful 

 species. 



Uredo Smilacis ScJiw. 



Leaves of Lilium Canadense. Buffalo. August. Clinton. 



Uredo Empetri D. C. 



Leaves of the crowberry, Empetrwn nigrum. Summit of 

 Haystack Mountain. August. 



JGcidium JSTes^eje Gerard. 



Stems and leaves of Nescea verlicillata. Poughkeepsie. 

 Gerard. Buffalo. Clinton. 



JEcidium dubium Clinton, n. sp . 



Spots scattered, suborbicular, yellow or purplish ; peridia 

 small, subcircinating, crowded ; spores yellow. 



Lower surface of leaves of Calystegia. Squaw Island. 

 June. Clinton. 



Very near M. Compositarum, and in the dried state 

 scarcely to be distinguished from that species except by the 

 habitat. 



Peridermium elatinum L7c. {Mcidium elatinum A. & S.) 

 Living leaves of balsam trees, Abies balsamea. Indian 

 Lake. July. The leaves attacked by this fungus scarcely 

 exceed half the usual size. 



Peridermium balsameum n. sp. 



Spots indefinite, whitish or pale yellow ; peridia subro- 

 tund, slightly elevated, generally arranged in two rows, at 

 first entire, then lacerated at the apex ; spores subglobose, 

 rough, white, about .001' in diameter. 



Lower surface of balsam leaves. Adirondack Mountains- 

 August. (Plate 2, figs. 24-26.) 



The affected leaves attain the usual size, but, by their pale 

 color, contrast beautifully with the healthy ones, and give 

 the foliage a variegated appearance. The fungus was 

 observed on young trees only. 



Peridermium decolorans n. sp. 



Spots indefinite, yellow, generally discoloring the whole 

 leaf ; peridia subrotund or oblong, pustulate, at length rup- 



