Arthur: Uredinales of Costa Rica 



143 



95. Puccinia exornata Arth. (on Carduaceae) 

 Baccharis rhexioides H.B.K., San Ramon, Jan. 13, 191 6, II, III, 

 4 2 3- 



A long-cycle species, having all spore forms, which occurs also 

 in Guatemala. 



96. Puccinia oaxacana Diet. & Holw. (on Carduaceae) 

 Conyza asperifolia (Benth.) Benth. & Hook. f. (Baccharis hir- 

 tella DC), San Jose, Dec. 10, 1915, I, ii, III, 253; same, Jan. 

 10, 1916, I, ii, III, 403; same, Jan. 18, 1916, I, ii, III, 446; 

 road to Volcan de Poas, Jan. 5, 1916, II, III, 366. 

 A long-cycle rust with all spore forms, occurring also in 

 Guatemala and Mexico. 



97. Puccinia Gymnolomiae Arth. (on Carduaceae) 

 Gymnolomia microcephala Less., San Jose, Dec. 27, 191 5, II, III, 

 301. 



A long-cycle species, extending northward into Mexico, but 

 the initial stage is yet unknown. 



98. Puccinia Tithoniae Diet. & Holw. (on Carduaceae) 

 Tithonia rotundifolia (Mill) Blake (T. tagetiflora Desf.), trail 

 to Volcan de Poas, Jan. 5, 1916, II, III, 569 ; San Ramon, 

 Jan. 13, 1916, II, III, 425. 

 A long-cycle rust of Mexico and Guatemala, whose initial stage 

 is yet unknown. 



99. Puccinia abrupta Diet. & Holw. (on Carduaceae) 

 Viguiera silvatica Klatt, San Ramon, Jan. 13, 1916, II, 424. 



A long-cycle species, very common in Mexico, whose initial 

 stage is unknown. It extends into Texas and into the West 

 Indies. 



100. Puccinia proba Jackson & Holway sp. nov. (on Carduaceae) 



Zexmenia frutescens villosa (Polak) Blake, San Jose, Dec. 11, 

 1915, II, III, 247 \ same, Jan. 3, 1916, II, III, 350, 351. 



