178 Bulletin 313 



Uromyces howei (Peck) Arth. — On Asclepias sp. 



"O. Pycnia and aecia unknown. 



"II. Uredinia h}^ophyllous, scattered, roundish, 0.5 mm. across, 

 early naked, pulverulent, cinnamon-brown, ruptured epidermis evi- 

 dent; urediniospores globoid, 18-25 by 23-28 /*; wall golden brown, 

 thin, 1-1.5 fx, evenly echinulate, the pores 4, equatorial. 



"III. Telia hypophyllous, thickly scattered, roundish, 0.5 mm. 

 across, early naked, pulverulent, light chestnut-brown, ruptured 

 epidermis noticeable; teliospores broadly ellipsoid or globoid, 18-23 

 by 20-30 IX, rounded or somewhat obtuse at both ends ; wall chestnut 

 brown, rather thin, 1.5 fi, slightly thicker above owing to presence of 

 a small semi-hyaline papilla, finely and closely verrucose; pedicel 

 colorless, fragile, short." In North American Flora, v. 7, p. 264 

 (1912) as Nigredo howei. 



976. Uredospores, 1/12 from Asclepias sp. 977. TeletiLospores, 1/12. 



PucciNiA ANTiRRHiNi Dictcl & Holw. — On cultivated snapdra- 

 gon in greenhouses and in the garden. Producing on the average 

 uredospore sori which are chestnut-colored, uredospores elliptical 

 or globose, 23-30 x 21-25 /x, chestnut-colored, minutely echinulate, 

 germinating pores 2 rarely 3 ; teleutospore sori cushion-shaped, 

 dark, on pale spots on foliage or scattered upon dry spots, amphigen- 

 ous, particularly hypophyllous on the average or minutely irregu- 

 larly scattered on large stems, surrounded by a split epidermis, con- 

 fluent, teleutospores oblong or irregular, apices conical, rotund or 

 truncate, bases attenuate, rarely rounded, at septa moderately con- 

 stricted, epispore obscurely chestnut-colored or faintly dark, apices 

 somewhat thickened, covering smooth, 36-50 x 17 x 26 pedicel long, 

 Hedwigia, v. 36, p, 298 (1897). 



978. Infected leaves of Antirrhinum majtis. 979. Uredospores, 1/12. 980. 

 Infected stem of A. majiis. 981. Teleutospores, 1/12, 



PucciNiA ASPARAGi D. C. — On Cultivated asparagus. Described 

 by Holway as follows : 



"O. Spermagonia yellow, clustered in the center of the groups of 

 eecidia. 



"I. Aecidia on the stems, scattered or collected in irregular, ob- 

 long- groups, low margin incised not reflexed ; secidiospores yellow 

 globose to polygonal, finely verrucose, 16-28 /x in diameter. 



"II. Uredosori cinnamon-brown, oblong, sometimes confluent up 

 to 4 mm. in length, surrounded by the ruptured epidermis; uredo- 

 spores globose to ovate, minutely echinulate, 20-32 x 20-24 fi ; germ- 

 pores 5. 



