182 



DECADES OF MAINE FUNGI. 



Puccinia, Pers. 



Spores of two kinds. Early spores, or Uredo spores, globose or nearly so, 

 unicellular, at first with a short peduncle which ultimately falls away, yellow 

 or brown. Later spores uniseptate, supported on a distinct peduncle. 



This genus is largely represented in North America. Very few are yet 

 known from Maine. 



Puccinia graminis, Pers. 



Uredo-form, (Trichobasis rubigo-vera, Lev.) 

 Spots yellow, heaps oval, scattered, generally on the upper 

 surface ; epidermis at length bursting longitudinally ; spores 

 sub-globose, reddish brown, easily dispersed. Ravenel, Fung. 

 Car. Ex. i. No. 100. 



Septate form — Spots pale, diffuse ; sori linear, confluent, am- 

 phigenous ; spores at length black, clavate, very slightly con- 

 stricted, uniseptate. On the leaves and culms of corn and grass. 

 (Westbrook, E. C. B. ; New York, W. TV". D.) 



( Uredo Rubigo. Scliweinitz Fung. Am. Bor. No. 2817.) 



(Puccinia graminis. Schw. Syn. Car. No. 492. Fung. Am. Bor. No. 2905. Lea, Pla'nts 

 of Cincinnati, p. 70. -Ravenel, Fungi Car. Ex. i. No. 99.) 



Puccinia striola, Link. 



Uredo-form — (Trichobasis Caricina, B.) 



Spots reddish; sori oval, minute, scattered, surrounded by the 

 ruptured epidermis; spores sub-globose, reddish, then brown. 



Septate form — Spots pallid ; sori linear, crowded, distinct, sub- 

 convex ; spores at length black,oblong and slightly constricted, 

 or obovate and not constricted. 



On sedges, rushes, &c. (Westbrook, E. C. B.) 

 (Schweinitz, Fung. Am. Bor. No. 2906.) 



Puccinia Circaeee, Pers. 

 Uredo-form — Uncertain. 



Septate form — Spots obliterated ; sori minute, semiglobose, crowded 

 into subrotund patches, occasionally confluent, generally covered 

 with the epidermis. 



On leaves of Circaza. (Westbrook, E. C. B.) 



(Schweinitz Syn. Car. No. 491. Fung. Am. Bor. No. 2938. Lea, Plants of 

 Cincinnati, p. 70.) 



Puccinia Violarum, Link. 



Uredo-form (Trichobasis Violarum, Berk.) Spots yellowish; 

 sori subrotund, scattered, generallj- on the under surface ; epi- . 

 dermis ruptured, persistent ; spores sub-globose, brown. 



Septate-form — Spots yellowish ; sori hypogenous, small, crowded, 

 ' covered with the epidermis, then surrounded by it ; spores brown, 

 elliptic, or broadly elliptic, slightly constricted, uniseptate. 



On Violet leaves, (Scarboro', Westbrook, E. C. B.) 



Both forms of spores are often present in the same pustule. 



