420 PLANT DISEASES 



long ; others on the bark, often 6 mm. broad, saccate, torn, 

 crowded, white, spores various in form, up to 40 X 17-28 /*, 

 warted, orange ; sori of uredospores yellowish-rufous, soon 

 pale, pulverulent ; spores in short chains, soon separating, 

 elliptical or subcylindrical, orange, warted, 20-40 x 14-26 p; 

 sori of teleutospores forming waxy, slightly convex crusts, 

 yellowish-rufous then red, spores cylindrical or cylindric- 

 clavate, up to 110X17-35 /*, apex flattened, generally 

 4-celled, bright rufous-orange. 



Chrysomyxa, Unger. Teleutospores transversely many- 

 septate, arranged in a single series, or sometimes branched, 

 lower loculi sterile, coalescing in a yellow or reddish, 

 somewhat waxy, flat or slightly convex stratum ; pro- 

 mycelium generally 4-septate, each cell producing a 

 single secondary spore on the apex of a slender sterigma ; 

 uredospores as in Coleosporium ; aecidia as in Puccinia. 



Chrysomyxa rhododendri, De Bary, Bot. Ztg., 1879, 

 p. 809, t. x., f. 1-6. Aecidia on yellowish spots, in 1-2 

 rows on the needles ; pseudoperidia cylindric, margin torn, 

 white, up to 3 mm. long, cells much compressed ; aecidio- 

 spores variable in form, 17-45X12-22 /*, warted, orange- 

 yellow; uredospore sori rounded, oblong, or angular, 

 scattered or gregarious, on variously coloured spots ; uredo- 

 spores generally subpolygonal, globose, or oblong, i7-28x 

 15-22 fj., warted, orange-yellow; teleutospore sori convex, 

 irregularly arranged in large or small groups on reddish- 

 brown spots ; teleutospores 10-14 P- broad, not dilated 

 upwards, obtusely rounded. 



Chrysomyxa abietis, Unger, Beitr. zur Vergl. PathoL, 

 p. 24, fig. Sori of teleutospore stage (hybernating mycelium) 

 linear, seriate, waxy, reddish-yellow, seated on yellowish 



