Arthur: Uredinales of Porto Rico 71 



37. Uromyces columbianus Mayor. 

 On Carduaceae : 



Melanthera canescens (Kuntze) O. E. Schultz, Mayagiiez, 

 March 13, II, 162, March 20, II, ioj; Anasco, March 

 28, II, 164; Maricao, March 25, II, 165; Yauco, March 

 31, II, 167; Barceloneta, April 6, II, 166. 



38. Uromyces bidenticola (P. Henn.) comb. nov. (U . Bidentis 

 Sydow, not Lagerh.). 



Uredo bidenticola P. Henn. Hedwigia 37 : 279. 1898. 

 On Carduaceae: 



Bidens leucantha Willd., Yauco, March 3, II, 136; Hormi- 

 gueros, March 11, II, J35; Barceloneta, April 5, II, 157. 

 Bidens pilosa L., Boqueron, March 11, II, 141; Maricao, 

 March 22, II, 140; San German, April 1, II, iii, 138; 

 Tanama River Valley, April 7, II, 142. 



39. Uromyces Bidentis Lagerh. (U. densns Arth.). 

 On Carduaceae : 



Bidens pilosa L., Maricao, in cemetery, March 25, ijo. 

 A few sori of Uromyces bidenticola occur on the same leaves 

 with the short cycle form, the latter being abundant and cinereous 

 from germination. Neither the original description nor type 

 material of Lagerheim's Uromyces Bidentis had been seen by the 

 writer until recently. It is now found that Lagerheim begins 

 his diagnosis (Bull. Soc. Myc. Fr. 11: 213) with the descriptive 

 word " Leptouromyces," and that the specimens which he dis- 

 tributed from the type locality, judging from the one in the 

 herbarium of the N. Y. Bot. Garden, fully establish the fact that 

 his name applies to the short cycle species. This requires that 

 the other, long cycle species be called Uromyces bidenticola, the 

 type locality being Jamaica, on Bidens leucantha. The applica- 

 tion of the short cycle name to the long cycle species was first 

 made by the Sydows (Monog. Ured. 1: 3. 1909). It appears 

 that the first clear recognition of the two forms was by Bubak 

 as early as 1904, for he says in connection with a specimen of 

 Uredo Bidentis from the Canary Islands, distributed in the 

 Austrian Kryptogamae Exsiccatae no. 937, that " on the Hohnel's 

 collection (Sydow, Ured. 164/) there also occurs Uromyces 



