478 
J. C. ARTHUR 
characters are quite dissimilar. Coulter and Rose (Contr. U. S. 
Nat. Herb. 3 : 306) consider the host of this rust to be somewhat like 
Arracacia and Smyrnium, but not closely allied to any genus of the 
family. The life cycle could not be completed from the material in 
hand. The germination of the teliospores does not seem to take place 
in the sorus at maturity. 
147. PucciNiA OBLIQUA Berk. & Curt, (on Asclepiadaceae). 
Philihertella crassifolia HemsL, Laguna, Lake Amatitlan, Feb. 8, 
1915, igy, 198. 
Asclepiad vine, San Rafael, 7000 feet alt., Dept. Guatemala, Jan. 9, 
1915, 45 ; same, between San Lucas Tollman and Patalul, Feb. 4, 
1915, ig2\ Mazatenango, Feb. 21, 1915, 519. 
An exceedingly variable short-cycle species in both gross and 
microscopic characters. The two collections from Lake Amatitlan 
are quite unlike in gross appearance. Number 198 has large, compact 
sori, each often with a ring of smaller sori about it, in contrast to the 
groups of numerous, small, pulvinate sori generally seen. This form 
with large sori corresponds to a similar form of Puccinia Asteris, 
which was once given the name of P. monoecia. The same species 
was collected by Kellerman on P. crassifolia at Laguna, Lake Amatit- 
lan, Feb. II, 1905, 4348 (Kellerm. Fungi Sel. Guat. 5), and again at the 
same place Jan. 20, 1906, 5437, and reported by Kern in Journ. Mycol. 
/. c. under the name of P. Cynanchi Lagerh., a name now treated as a 
synonym. 
148. Puccinia Marsdeniae Diet. & Holw. (on Asclepiadaceae). 
Marsdenia mexicana Decaisne, San Lucas Tollman, 5100 feet alt., 
Dept. Solola, Feb. 2, 1915, II, iii, 17/; same, Jan. 4, 1917, II, 
III, 677. 
This striking rust was previously known only from the type 
locality at Cuernavaca, Mexico. Its initial stage has not yet been 
seen. 
149. Puccinia nocticolor Holw. (on Convolvulaceae). 
Ipomoea fistulosa Mart., Mixco, Dept. Guatemala, Jan. 9, 1915, 
I, III, 40. 
This long-cycle rust has heretofore been known only from a number 
of collections on /. intrapilosa, all made by Professor Holway in Mexico. 
No pycnia are yet known, and uredinia do not occur. The aecio- 
spores are sometimes thickened up to 12 above. The species has 
been published as Allodus nocticolor (Holw.) Orton. 
