Jan. 1907] The Rusts of Guatemala 23 



The hosts of the first three collections were determined by 

 John Donnell Smith, that of the last collection by J. M. Green- 

 man. Only urediniospores could be found on any of the collec- 

 tions of Hyptis. Two collections, one on Hyptis urticioides, and 

 one on H. lilacina, are not included here, as they differ in having 

 urediniospores with more dense and finer markings and several 

 scattered pores. These have not been assigned to any species. 



32. PUCCINIA HELIOTROPII Kern & Kellerm. sp. nov. 



III. Telia hypophyllous, gregarious, densely crowded in 

 orbicular groups, 1.5-4 mm. across, often confluent, round, small, 

 0.1-0.2 mm. across, early naked, pulverulent, chestnut-brown, 

 becoming cinereous by germination, ruptured epidermis incon- 

 spicuous ; teliospores oblong, rounded or obtuse above, usually 

 narrowed below, 14-10 x 30-40 /a, somewhat constricted at sep- 

 tum, wall pale cinnamon-brown, thin, about i yu,, thicker at apex 

 (2-4 /a), smooth; pedicel colorless, about half length of spore. 



On Heliotropmrn indicum L. (host no. 4372), Gualan, De- 

 part. Zacapa, alt. 122 m.. Mar. 12, 1905, no. 4326 (type) and Dec. 

 30, 1905, no. 5422. 



Host no. 4372 was determined by John Donnell Smith and 

 the same collection also bears aecia which without doubt belong 

 to an entirely distinct species of rust. This species is of the or- 

 dinary leptopuccinia type. It differs from Puccinia heliotropi- 

 cola Speg. by the longer and more oblong spores with a thickened 

 apex. 



33. PERIDERMIUM GRACILE Arth. & Kern.— On 

 Pinus aiifolia Lindl., Antigua, Depart. Sacatepequez, Feb. 13, 

 1905, nos. 4626, 5355, 5324. 



One of the above collections (host) was submitted to C. S. 

 Sargent for identification, the others have been determined by 

 comparison. The type of the species was on the same host from 

 Oaxaca, Mexico. 



34. AECIDIUM CISSI Wint.— On Cissus sicyoides L, 

 (host no. 5223, det. by J. M. Greenman), Gualan, Depart. Zacapa 

 Dec. 28, 1905, no. 5440; Los Andes, Depart. Izabal, Jan. 17, 1905, 

 no 5335- 



35. AECIDIUM GUATEMALENSIS Kern & Kellerm. 



sp. nov. 



O. Pycnia epiphyllous, gregarious, abundant on discolored 

 spots opposite the aecia, inconspicuous, punctiform, subepidermal, 

 becoming dark brown, globoid, 100-115/A wide, 80-105/^ high; os- 

 tiolar filaments up to 6.Sju, long. 



