434 
J. C. ARTHUR 
scopic layer. They are extruded from the mouth of the sorus and ad- 
here in filaments to some extent, much as the teliospores Jo. 
Were it not for the agglutinating action of the outer coat of the 
spores and the dropping away from the pedicel of the teliospores, 
after the fashion of urediniospores, this rust would doubtless be called 
a species of Uromyces. The decision reached by the Sydows (Monog. 
Ured. 3: 331) to place the genus Skierka under the Aecidiaceae (Pucci- 
niaceae) appears to be well founded. The fortunate discovery of 
pycnia with the American material, thus completing the life cycle, 
adds to the understanding of its relationship. 
The author takes special pleasure in commemorating the extensive 
and fruitful explorations by Professor Holway, and his untiring de- 
votion to botanical science, by dedicating this unique species of rust to 
him. 
59. Sphenospora pallida (Wint.) Diet, (on Smilaceae). 
Smilax sp., San Felipe, Dept Retalhuleu, Jan. 14, 191 7, II, HI, 
yiS; Progreso, on the Puerto-Barrios-Guatemala City Ry., 
Feb. 12, 1917, II, III, 8s9. 
This waxy-looking rust also occurs in Costa Rica and South Amer- 
ica. 
Both uredinia and telia are subepidermal. The manner of septa- 
tion of the teliospore, by which the two cells are equally poised on the 
pedicel, and not to any extent superposed, appears to warrant the 
validity of the genus. The gross appearance of the waxy telia is very 
distinctive. Pycnia have not been seen, and the full life cycle is yet 
unknown. The germination of the teliospores appears to be apical. 
60. Baeodromus Eupatorii Arth. (on Carduaceae). 
Eupatorium Aschenhornianum Schauer, Chinautla, Dept. Guate- 
mala, Feb. 12, 1916, 4^8, 484. 
A short-cycle rust, heretofore known only from two collections 
made by Professor Holway in central Mexico. 
61. PucciNiosiRA PALLiDULA (Spcg.) Lagerh. (on Tiliaceae). 
Trmmfetta semitriloha L., Mazatenango, Dept. Suchitepequez, 
Feb. 21, 1916, 50Q. 
A short-cycle rust, very common in tropical America. It was 
collected by Kellerman on Triumfetta sp., at Guatemala City, Feb. 3, 
1905, 4608, and reported by Kern in Journ. Myc. /. c. 
