450 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
ITrocystis sorosporioides Korn. 
Urocystis sorosporioides Korn., Fckl. Symb. Myc., Nachtr., 3 : 10. 1875. 
Sori on stems, petioles, and leaves, usually forming pustules of 
considerable size and causing more or less distortion to host, upon 
rupture disclosing dusty brown black spore mass; spore balls dark 
reddish brown, irregular, oblong to subspherical, firm, chiefly 30- 
60 p , rarely 90 p, in length ; sterile cells smoky or yellowish tinted, 
usually completely covering spores, ovoid to subspherical, 8-15 p in 
length ; spores reddish brown, oblong to polyhedral or subspherical, 
usually 4—12, rarely 1—3, smooth, chiefly 13-17 /x, most elongated 
rarely 22 p, in length. 
Hosts: Aconitum Columbianum , Utah; Aquilegia caerulea , 
Utah; Delphinium scopulorum ,—; Delphinimn sp., Calif.; Tha- 
lictrum alpinum, Greenland ; T. Fendleri , Utah ; Thalictrum sp., 
Ariz., Mass. 
This species seems to be more common in the western than in the 
eastern part of the United States. It exhibits some variation on 
the different hosts. It is distinguished from Urocystis Anemones by 
its larger spore balls containing more numerous spores with a more 
complete covering of sterile cells, and by the more conspicuous 
sorus. 
Urocystis Violae (Sow.) Fisch. de Waldh. 
Granularia violae Sow., Engl. Fungi, t. 440. 1822 ? 
Uredo vesicaria Kaulf., Kunz.-Schm. Myk., 1 : 67. 1817. 
Erysibe arillata p Violarum Wallr., FI. Crypt. Germ., 2 : 211. 1833. 
Polycystis Violae B. & Br., Ann. Mag. Nat. Hist., n, 5 : 464. 1850. 
Sorosporium schizocaulon var. Violae Casp., Rab. Herb. Myc., 190. 1855. 
Urocystis Violae Fisch. de Waldh., Bull. Soc. Nat. Mosc., 40 1 : 258. 1867. 
Sori on stems, exposed rootstocks, petioles and veins of leaves, 
forming prominent irregular swellings often several cm. in length, 
lather permanently covered by the tissues but upon rupture disclos¬ 
ing black brown spore mass; spore balls reddish brown, rather irreg¬ 
ular, oblong to subspherical, chiefly 28-55 p in length; sterile cells 
yellowish tinted, with age sometimes becoming rather obscure, 
small, 6—10 p in length; spores light reddish brown, ovoid to spheri¬ 
cal or polyhedral, chiefly 4-8 in a ball, mostly 11-15 p in length. 
Hosts: Viola odorata , Canada; Viola sp.,? Minn. 
