196 MICROSCOPIC FUNGI. 



Aregma obtusatum, Tr. Strawberuy Brand; hypo- 

 genous, scattered, in minute tufts ; spores multiseptate, terminal 

 joint obtuse ; peduncles equal.— On leaves of barren Strawberry. 

 Autumn. Common. (Plate III. fig. 35.) 



Triphragmitjm, Lk. 



Spores trilocular, septa mostly yertical and horizontal. — Berk. 

 Outl., p. 332, 



Triphragmium Ulmarise, Lk. Meadow-sweet Beand ; 

 spots_ obliterated; sori at first subrotund, covered with the epi- 

 dermis ; at len^^th, when the cuticle has vanished, effuse ; spores 

 brown, subturbinate, divided by a vertical dissepiment, shortly 

 pedicellate. — On leaves of Meadow-sweet, Spircea idmaria. 

 Autumn. (Plate III. fig. 48.) 



PucciNiA, Pers. 



Spores miiseptate, supported on a distinct peduncle. — Berk, 

 OutL, p. 329. 



Puccinia graminis, Pers. Corn Mildew; spots pale, 

 diffuse; sori linear, confluent, amphigenous; spores at length 

 black, clavate, very slightly constricted. — On the leaves and culms 

 of corn and grass. Autumn. Yery common, and injurious to 

 corn. (Plate lY. figs. 57— 59.) 



Yar. ^. Arimdmis, Grev. Sori broad ; spores more constricted 

 nnd with longer peduncles. — On the leaves and sheaths of reeds. 

 Very common. 



Puccinia striola, Lk. Sedge Mildew ; spots pallid ; sori 

 linear, crowded, distinct, ^ subconvex ; spores at length black, 

 oblong and slightly constricted, or obovate, and not constricted. 

 — On Sedges, Kushes, &c. Autumn. Common. 



Puccinia coronata, Cd. Coronated Mildew ; spots pal- 

 lid ; sori linear, short, crowded, not confluent, surrounded by the 

 ruptured epidermis ; spores ^ shortly pedicellate, paUid ; the apex 

 surrounded by obtuse radiating teeth. — On various Grasses. 

 Autumn. Not uncommon. (Plate lY. figs. 60—62.) 



Puccinia truncata, B. and Br. Iris Brand ; spots 

 obliterated; sori oblong, brown, surrounded by tlie scarious 

 epidermis ; spores obovate-oblong, even, attenuated below, 

 upper cell abruptly truncate.— On Iris foetidissima. Autumn. 



Puccinia Asparagi, DC. Asparagus Brand ; spots none ; 

 sori reddisli-brown, generally on the stems, scattered and crowded, 

 surrounded by the ruptured epidermis; spores oblong, obtuse, 

 constricted ; peduncle white, long, thread-like. — On dead stems 

 of Asparagus. Autumn. 



