476 J. C. ARTHUR 
143. PucciNiA FucHSiAE Syd. & Holw. (on Onagraceae). 
Fuchsia microphylla H.B.K., Quezaltenango, Jan. 19, 191 7, 75J. 
Lopezia hirsuta Jacq., San Rafael, Dept. Guatemala, Jan. 9, 1915, 
J4; Antigua, Dept. Sacatepequez, Dec. 28, 1916, 64^ (with 
some Uredo Fuchsiae). 
A short-cycle rust, heretofore known only from the type collection 
by Professor Holway, made in central Mexico. 
• 
144. PucciNiA Hydrocotyles (Link) Cooke (on Ammiaceae). 
Hydrocotyle Bonariensis Lam., San Lucas Toliman, 5100 feet alt., 
Dept. Solola, Feb. 3, 1915, II, 190. 
Hydrocotyle mexicana Schlecht. & Cham., San Lucas Toliman, 
6500 feet alt.. Dept. Solola, Feb. 3, 1915, II, i8q. 
A common long-cycle rust of both North and South America. 
Pycnia have not yet been found, and aecia probably do not occur in 
the life cycle. The aecia on Hydrocotyle that have been referred here 
are doubtless heteroecious. 
145. Puccinia Arracacharum (Lindr.) Arth. comb. nov. (on Am- 
miaceae) . 
Arracacia bracteata Coult. & Rose, Volcan de Agua, Dept. Sacate- 
pequez, Jan. 13, 1915, O, I, II, III, 86; same, March 7, 1916, 
O, I, II, iii, 55<?. 
This distinctive species is Eriosporangium-like in its general combi- 
nation of characters, and especially in having aecia without peridia, and 
pale teliospores germinating at maturity in the sorus. It is quite 
unlike P. imperspicua-Syd. on another species of Arracacia from Mexi- 
co, a species without uredinia, with a peridium in the aecium, and with 
thicker-walled teliospores. 
The species was described by Lindroth in 1891 (Medd. Stockholms 
Hogsk. Bot. Inst. 4: i, 5) from collections made by Lagerheim in 
Ecuador, S. A. During two years' observation Lagerheim did not 
find the aecia, which were very common, to be followed by uredinia 
and telia (cf. Lindroth, Die Umbelliferen-Uredineen, Act. Soc. Faun. 
FL Fenn. 22^: 142. 1902), and their genetic association was considered 
doubtful. The aecia were therefore described as Caeoma Arraca- 
charum (/. c.yp. i), and the uredinia and telia as Puccinia Arracachae 
(I. c, p. 5), in which disposition the Sydows concurred (Monogr. 
Ured. i: 360. 1902). In the Guatemalan collections by Professor 
Holway, cited above, all spore forms occur on the same leaves. More- 
