182 Bulletin 313 



or crowded, often confluent, sometimes arranged circularly, snuflf- 

 brown, average 1-1^ mm. diam., causing dirty-brown, indefinite 

 spots on upper surface of leaf, which gradually extend and ulti- 

 mately decay. 



"Uredospores ellipsoid to obovoid, yellowish-brown to golden- 

 brown, echinulate, with 3 equatorial germ-spores on the face, 28-35 

 X 22-25 fi (32 fx long very common, occasionally reaching a length of 

 4S fi) ; pedicels hyaline, rarely persistent, stout, long, up to 60 /x. 



"III. Teleutosori on both surfaces of leaf, but chiefly on under 

 surface, prominent, roundish, pulvinate, solitary or confluent in 

 groups, often concentrically arranged, dark-brown to black, soon 

 naked, compact. "Teleutospores at first sparingly intermixed with 

 uredospores, ellipsoid to pear-shaped or clavate, rounded or occa- 

 sionally truncate at apex, and thickened (up to 9 /x) mostly rounded 

 at base or sometimes slightly attenuated, chestnut-brown, v/ith 

 strong, finely punctulate epispore, 35-60 x 19-28 fi; pedicel hyaline, 

 stout, persistent, 40-80 x 7-9 /x." McAlpine — Rusts of Australia, p. 

 153 (1906). 



988. Infected leaf of chrysanthemum sp. 989. Uredospores, 1/12. 



PucciNiA CORONATA Cda. — On oats. Described by Sydow as 

 follows : 



"Aecidia hypophyllous, on the petiole, spots yellow or yellowish- 

 purple, depressed in a circular fashion or irregularly distributed, 

 distorting the foliage, and especially the petiole, cylindrical margin 

 white, lacerated, folded back, secidiospores angular to globose, deli- 

 cately verrucose, golden colored, 16-25 x 12-20 /*; uredosori hypo- 

 phyllous, scattered or in series, sometimes confluent, more or less ob- 

 long, pulverulent, golden-colored, uredospores globose, subglobose 

 or ovate, echinulate, yellow 20-30 x 16-24 fx possessing 3-4 germina- 

 tion pores, paraphyses few, intermingled, teleutosori hypophyllous 

 for the most part irregularly scattered, sometimes confluent, oblong 

 or linear, covered a long time by the epidermis, at length naked, 

 dark, teleutospores clavate, apices flattened, crowded with denticu- 

 late out-growths, middle not or very little constricted, base attenu- 

 ate, smooth, brown, 35-36 x 12-22 fi; pedicel short, somewhat 

 broad." 



Hab. Aecia on leaf blade and petioles of Rhamnus sp., uredo and 

 teleuto sori on leaves of oats, etc. 



990. Uredospores, 1/12. 991. Teleutospores, 1/12. 



