Jan. 1907] The Rusts of Guatemala 21 



Although all previous collections of this species have been 

 on Celosia, these specimens on Iresine agree so well with the type 

 specimen, and the similarity between the hosts is so great, that 

 they are placed here without hesitation. The hosts have been 

 detenmined by J. N. Rose and W. A. Kellerman. 



15. UROMYCES HELLERIANA Arth. — On Cayaponia 

 racemosa scaherrima Cogn. (host no. 5207, det. by John Donnell 

 Smith), Moran, Depart. Amatitlan, alt. 1205 m., Feb. 1906, no. 

 5436. 



16. UROMYCES INDIGOFERAE Diet. & Holw. — On 

 Indigofera miicronata Spreng. (host no. 5228, det. by J. M. 

 Greenman), Gualan, Depart. Zacapa, Dec. 28, 1905, no. 5444. 



17. PUCCINIA CYNANCHI Lagerh. — On Philihertella 

 crassifolia Hemsl. (host no. 4359, det. by John Donnell Smith), 

 Laguna, Depart. Amatitlan, alt. 1200 m., Feb. 11, 1905, no. 4348, 

 Jan. 20. 1906. no. 5437. 



This species is morphologically very similar to Puccinia 

 Gonolohi Rav., but differs in its habits of growth, spreading 

 evenly over the surface, extending to the young shoots and some- 

 times forming witches' brooms, while in P. Gonolobi the sori are 

 in small groups. 



18. PUCCINIA TITHONIAE Diet. & Holw. — On Ti- 

 thonia ttibaefonnis Cass, (host no. 4374, det. by John Donnell 

 Smith), Guatemala, Depart. Guatemala, alt. 1465 m., Feb. 3, 1905, 

 no. 4328; Laguna, Depart. Amatitlan, alt. 1200 m., Jan 30, 1906, 



no. 5425. 



19. PUCCINIA SENECIONICOLA Arth. — On Senecio 

 petasioidcs Greenm. (host no. 5200), Volcano Atitlan, Depart. 

 Solola, Feb. 16, 1906, no. 5442, (host no. 5201), Volcano Cerro 

 Quemado, Depart. Quezaltenango, Feb. 8, 1906, no. 5418, Senecio 

 Warszcixncsii A.Br. & Bouche (host no. 5206), Volcano Cerro 

 Quemado, Depart. Quezaltenango, Feb. 8, 1906, no. 5445. 



The hosts were determined by J. M. Greenman. 



20. PUCCINIA ROSEA (Diet. & Holw.) Arth. — On 

 Ageratum conysoides L., (host no. 4386), Mazatenango, Depart. 

 Suchitepequez, alt. 330 m., Feb. 28, 1905, No. 4346, (without host 

 no.) no. 5373: San Filipe, alt. 615 m., Depart. Retalhuleu, Feb. 

 4, 1906, no. 5446. 



This species is very similar in the uredinial and telial stages 

 to Puccinia conoclinii Seym, and has about the same host dis- 

 tribution. It may be distinguished by its larger spores, the 

 thicker walls and more pronounced umbo of the teliospores. 



