REPORT OF THE BOTANIST. 115 



USTILAGO UTRICULOSA Tul. 



A form of this species was found in Forestburgh, having 

 the spores rather larger than nsual and their reticulations 

 smaller and less distinct. It inhabits Polygonum sagitta- 

 tum. Nine species of this genus are now known to occur 

 in the State. They are injurious to the plants they attack 

 and are worthy of careful study. To facilitate the identifi- 

 cation of the species, the following analytical synopsis and 

 list of host plants is subjoined : 



a. Spores produced in the leaves only b. 



a. Spores produced in the flowers, fruit or ovaries c. 



b. Spores produced in suborbicular swellings or blotches . . . Erythronii. 



b. Spores produced in long lines longissima. 



c. Spores intensely black in the mass d. 



c. Spores black, generally tinged with brown e 



c. Spores black, tinged with purple utriculosa. 



d. Inhabiting Jnncus Junci. 



d. Inhabiting Carex urceolorum. 



e. Place of spore formation, much swollen or distended Maydis. 



e. Place of spore formation, not much swollen f . 



f. Generally affecting but few of the ovaries Montagnei. 



f . Generally affecting whole spikes or panicles g. 



g. Spores smooth, .0002 inch in diameter Carbo. 



g. Spores rough, .0004 inch in diameter Syntherismae. 



i 

 Ustilago Erythronii Clinton. Inhabits Erythronium Americanum 8m. 



U. longissima Tul. " Glyceria aquatica 8m. 



U. utriculosa Tul. " Polygonum (several species). 



U. Junci 8chw. " Juncus tenuis Willd. 



U. urceolorum Tul. " Carex (several species). 



U. Maydis Cd. " Zea Mays L. 



U. Montagnei Tul. " Rhynchospora alba Vahl. 



( Triticum vulgare Vill., etc. 

 U. Syntherismse 8chw. " Cenchrus tribuloides L. 



I have seen U. utriculosa on Polygonum Pennsylnanicum 

 and P. sagittatum. In Europe it occurs on other species. 



U. urceolorum is found with us on Carex Pennsylvania 

 and C. umbellata. In Europe it attacks other species. U. 

 Maydis Cd. is the same as U. Zem Schw., and U. Carbo Tul. 

 equals U. segetum Ditm. U. SyntTierismm is said to occur 

 also on Digitaria and Andropogon. 



In closing this report, grateful acknowledgments are ren- 

 dered to C. F. Austin, Esq., for aid in the determination of 

 Hepaticse, and to H. Willey, Esq., for aid in the determination 

 of lichens, and to all the botanists whose names appear in the 

 preceding pages, for their kind cooperation in the investiga- 



