UREDINALES OF GUATEMALA 
231. Aecidium guatemalensis Kern & Kellerm. (on Heliotropaceae). 
Heliotr opium indicum L. 
The type collection was made by Kellerman, at Gualan, 400 feet 
alt., Dept. Zacapa, March 12, 1905, 4326, and was described by Kern 
in Journ. Myc. I.e. No additional information has come to hand since 
the original collection was made. 
232. Aecidium seriatum sp. nov. (on Euphorbiaceae). 
Eumecanthus lancifolius (Schlecht.) Millsp. {Euphorbia lancifolia 
Schlecht.). 
Pycnia chiefly hypophyllous, numerous, in groups 1-3 mm. across, 
punctiform, noticeable, subcuticular, hemispherical, 80-115 ii in 
diameter by 40-75 yu high. 
Aecia hypophyllous, numerous, in more or less evident concen- 
tric circles surrounding the central group of pycnia, on spots 1.5-2 cm. 
across, yellowish below, reddish above, cupulate, 0.3-0.5 mm. in di- 
ameter, low, erect; peridium white, the margin irregularly torn; 
peridial cells nearly rectangular in radial longitudinal section, 15-22 
by 18-26 iJLj slightly overlapping, the outer wall smooth, transversely- 
striate, 6-8 11 thick, the inner wall closely and prominently verrucose, 
3-4/^ thick; aeciospores irregularly globoid, 12-18^1 in diameter; 
wall colorless, about i thick, very finely and inconspicuously verru- 
cose, often appearing smooth. 
The rust has the appearance of a heteroecious form, although the 
subcuticular pycnia indicate that it may be an autoecious form. 
The name is founded on a collection sent from the herbarium of the 
National Museum, made by H. Pittier, on Eumecanthus laneifolius 
(Schlecht.) Millsp. (Euphorbia laneifolia Schlecht.), between Cajval 
and Chimente, along Cahabor Rio, alt. 200 meters. Dept. Alta Vera 
Paz, March 4, 1905, 237. 
Index to Uredinales of Guatemala 
(New and newly combined names are in bold face) 
Aecidium albicans 230 
xA.ecidium seriatum 232 
singulare 229 
tubulosum 108 
tucumanense 166 
Alveolaria Cordiae 22 
Allodus noticolor 149 
Argomyces insulana 178 
parilis 167 
Byrsonimae 229 
Byrsonimatis 229 
Clibadii 65 
Cookeanum? 228 
guatemalensis 231 
Loranthi 228 
roseum 117, 189 
