408 PLANT DISEASES 



(1880). Sori pulvinate, minute, often densely gregarious, 

 orange ; spores subreniform, convex, free portion warted, 

 remainder smooth, 30-35 x 10-12 /x. 



The sterile cysts mentioned by the authors are only 

 young, still smooth spores ; the same occurs in H. 

 vastatrix, when the pustules are examined while young. 



Hemileia canthii, Berk, and Broome, Journ. Linn, Soc. 

 (Bot.) xiv. p. 93 (1875). Sori scattered on pale spots, 

 hypophyllous ; spores subreniform, free convex surface 

 warted, remainder smooth, 2 5-30 x 10-12 p. 



Cronartium, Fries. Aecidia produced on conifer leaves, 

 pseudosporidia elongated, aecidiospores concatenate ; 

 uredospores included in a pseudoperidium, brown; teleuto- 

 spores i-celled, aggregated into a column which springs 

 from the sorus of uredospores. 



Cronartium ribicolum, Deitr., Arch. Naturk. Liv. Esth. 

 und Kur lands ) ii. p. 287. Aecidiospores large, epispore 

 warted, one part smooth ; sori of uredospores forming 

 pustules, orange-rufous, minute, rounded, pseudoperidia 

 hemispherical, perforated at the apex, uredospores ellipti- 

 cal or ovoid, 19-35X14-22 /*, epispore hyaline, aculeate, 

 contents orange ; teleutospores forming a columella up to 

 2 mm. high, curved, yellowish-rufous. 



Cronartium asclepiadeum, Fries, Obs. Myc., i. p. 220. 

 Aecidiospores 22-26, rarely 30X16-20 /x, epispore partly 

 reticulated, partly warted; uredospore sori hypophyllous, 

 scattered, brown ; uredospores variable in form, echinate, 

 16-32x12-18 //., pale orange; columella of teleutospores 

 terete up to 2 mm. long ; teleutospores oblong, truncate- 

 obtuse, 12 /x broad ; sporidiola globose, smooth, pale 

 yellow, 



