204 MICROSCOPIC FUNGI. 



yellowish ; sori minute, crowded into orbicular patches ; spores 

 brown-black, obovate-oblong, frequently constricted, with the 

 upper joint globose. — On the under surface of the leaves of various 

 species of Polygonum. Autumn. Common. The Uredo spores 

 of this species are I¥icho6asis Polygonoram. 



Puecinia vaginalimn, Lk. Knotgeass Beand ; spots 

 none ; sori hypogenous, subrutund or oblong, at first surrounded 

 by the ruptured epidermis; spores brown, obtusely ovate; 

 pedicels long, filiform. — On leaves and stems of Knotgrass, Poly- 

 gonnm avicitlare. Anturan. I have never been able to fiod a 

 Puccinia on Polygonum aviculare, and suspect that only the 

 Uromyces occurs with us. 



Puceinia AmpliilDii, Fckl. Sori at first tuberculate, 

 black, then splitting the cuticle, compact ; pseudo-spores oblong- 

 clavate, constricted in the middle, stem short. — On leaves of 

 Polygonum amphibium. 



Puccinia BistortsB, DC. Spots none: sori scattered, 

 minute, numerous, rufous, hypophyllous, suborbioular; pseudo- 

 spores ovoid or oblong, obtuse, rounded, bright-brown, stem very 

 short.— On leaves of Polygonum viviparum and P. Bistortce. 



Puccinia Thesii, Chaill. Bastaed-Toabplax Bjiand; 

 cauline and amphigenous ; sori blackish-brown, small, roundish 

 or oblong, convex, scattered or aggregate, surrounded by the 

 ruptured epidermis ; spores ovate, obtuse, scarcely constricted ; 

 pedicels elongated. — On Thesium humifusum, in company with 



Puccinia PrimulsB, Grev. Peimeosb Beand ; hypogenous 

 deep brown, solitary, scattered, or concentric and subconfluent 

 spores obovate-oblong, slightly constricted. — On Primrose leaves 

 Wot common. 



Puccinia 'Veronicarum, DC. Veeonica Beand ; spot 

 vellowish; sori subglobose, aggregate, or circinating, central on 

 large ; spores brown, obovate-oblong, more or less constricted. — 

 On the under surface of the leaves of several species of Veronica 

 Not common. 



Puccinia Gleehomatis, DC. GEOUND-Ivr Beand ; spot-s 

 brownish ; sori subrotund, scattered, hypogenous ; spots brown, 

 rather short, subelliptic, scarcely at all constricted.— On leaves of 

 Ground Ivy, Olechoma fiederacea. September and October. Not 

 uncommon. (Plate IV. figs. 73, 74.) 



Puccinia Menthse, Pers. Mint Brand ; spots obliterated 



