2o6 BOTANICAL GAZETTE [march 



5. Uromyces Tranzschelii Sydow; Tranzschel, Ann. Myc. 

 8:20. 1910. 



O. Pycnia hypophyllous, scattered among the telia, or in groups, 

 noticeable, subepidermal, dark yellow, globoid or flask-shaped, 

 100-145 jit in diameter by 75-130 /x in height; ostiolar filaments 

 dense, agglutinated into a truncate column, 50-80 fi in height, 

 50-70 /x in diameter at the ostiole. 



III. Telia hypophyllous, occasionally sparingly epiphyllous, 

 numerous, evenly scattered over large areas, or sometimes in groups 

 around the pycnia, roundish, o . 2-0 . 6 mm. across, early naked by a 

 central pore, pulverulent, chestnut-brown, surrounding epidermis 

 crateriform, conspicuous; teliospores globoid or ellipsoid, 15-22X 

 19-30 /x, rounded at the ends, wall cinnamon-brown, 1.5-2.5 m 

 thick, apex 3-5 /x thick with a low, sub-hyaline apiculus, minutely 

 verrucose, the markings often in irregular longitudinal lines; 

 pedicel colorless, deciduous. 



On Euphorbiaceae : Chamaesyce serpens (H.B.K.) Small {Euphorbia 

 serpens H.B.K.) , California; Tithymalus montanus (Engelm.) Small {Euphorbia 

 Montana Engelm.), Colorado, New Mexico, Utah, Wyoming; T. robustus 

 (Engelm.) Small {Euphorbia montana robusta Engelm.), Colorado, Utah, 



oming 



locality 



Distribution: From Wyoming to New Mexico, California, and Lower 

 California. 



Exsiccati: Barth., N.Am. Ured. 499; Ellis and Ev., Fungi Columb. 1069; 

 Ellis and Ev., N.Am. Fungi 2230; Garrett, Fungi Utah. 97. 



Literature: Tranzschel, Ann. Myc. 8:1-35. 1910; Sydow, Monog. 

 Ured. 2:171-172. 1910; Saccardo, Syll. Fung. 21:560-561. 1912; Dietel, 

 Hedw. 28:185-187. 1889; Arthur, Bull. Torr. Bot. Club 45:152. 1918. 



This rust passed as Uromyces scutellatus (Schrank.) Lev., a 

 European species, until Sydow's description in 1910. Tranzschel 

 pointed out that U. Tranzschelii is similar to U. monspessulanus 

 Tranz.; indeed, other similarities to various Euphorbiaceous rusts 

 are evident. In his study of the autoecious rusts upon Euphorbia, 

 Tranzschel stated that most European autoecious species with 

 telia from diffused mycelium had passed as two species, Uromyces 

 scutellatus or U. excavatus; he divided such forms into some 12 

 species, and found a total of 27 autoecious species of Uromyces 



