204 MICEOSCOPIC FUNGI. 



yellowish ; sori minute, crowded into orbicular patches ; spores 

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

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

 species of Polygonum. Autumn. Common. The Uredo spores 

 of this species are Trichobdsis Polygo?iorum. 



Puccinia vaginalium, Lk. Knotgrass Brand ; spots 

 none ; sori hypogenous, subrotund or oblong^ at first surrounded 

 by the ruptured epidermis ; spores brown, obtusely ovate ; 

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

 gomim aviculare. Antumn. I have never been able to fiud a 

 Puccinia on Polygonum aviculare^ and suspect that only the 

 Uromyces occurs with us. 



Puccinia Amphibii, 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 Bistortse, DC. Spots none • sori scattered, 

 minute, numerous, rufous, hypophylious, suboroicular; pseudo- 

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

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



Puccinia Thesii, Chaill. Bastard-Toadflax Brand ; 

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

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

 ruptured epidermis; spores ovate, obtuse, scarcely constricted; 

 pedicels elongated. — On Thesium humifusum, in company with 

 Mcidium Them. 



Puccinia Primulse, Grev. Primrose Brand ; hypogenous 

 deep brown, solitary, scattered, or concentric and subconfluent 

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

 ISot common. 



Puccinia Veronicarum, DC. Veronica Brand ; spot 

 yellowish; sori subglobose, aggregate, or circinatmg, cttitral on 

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

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

 T\ot common. 



Puccinia Glechomatis, DC. Ground-Ivy Brand; spots 

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

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

 Ground Ivy, Glechoma hederacea. September and October. Not 

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



Puccinia Menthse, Pers. Mint Brand ; spots obliterated 



