540 
J. C. ARTHUR 
227. Peridermium guatemalense Arth. & Kern (on Pinaceae). 
Pinus filifolia Lindl. 
Collections were made by Kellerman, at Antigua, Dept. Sacatepe- 
quez, Feb. 13, 1905, 4624, S324, S355^ and reported by Kern in Journ. 
Myc. I.e., under the name P. gracile. No collection of the species 
other than these is known. 
228. Aecidium Loranthi Thiim. (on Loranthaceae). 
Psittacanthus calyculatus (DC.) G. Don. 
A specimen was taken, Feb. 27, 1902, by William Trelease in 
Guatemala, no locality given, and reported by Kern in Mycologia, 
I.e. The specimen was seen in the herbarium of the Missouri Botanical 
Garden, and was labeled ''Aecidium Cookeanum ? on Loranthus." 
Dr. Trelease was consulted regarding the host, and under date of 
January 24, 1916, replied: ''My impression is that I got specimens of 
the orange-flowered mistletoe. . . . Your Guatemalan rust is pretty 
clearly on a Psittacanthus, and very likely on P. ealyeulatus.'' Type 
collections of mistletoe rusts have not been available for comparison, 
but as near as can be told by the meager description this collection 
should be referred to A. Loranthi Thiim. The species has much 
larger aeciospores than in Uromyees ornatipes Arth. It may belong 
to one of the species published for South America, but no suitable 
material for comparison is at hand. 
229. Aecidium singulare (Diet. & Holw.) comb. nov. (on Malpighi- 
aceae) . 
Byrsonima crassifolia (L.) H.B.K. 
The rust was collected by Kellerman at Sierra de las Minas, 
2000 feet alt., opposite El Rancho, Dept. Baja Vera Paz, March 10, 
1905, and reported by Kern in Journ. Myc. I.e., as A. Byrsoni- 
mae K. & K., and issued in Kellerm. Fungi Sel. Guat. 11. It was ear- 
lier published from Mexico as Endophyllum singulare Diet. & Holw. 
It is very similar to A. Brysonimatis P. Henn. from Brazil, and may 
be identical with it. The species is also known from Nicaragua. 
The morphological appearance suggests a possible connection with a 
Cronartium, as its aecial stage. 
230. Aecidium albicans Arth. & Holw. (on Euphorbiaceae). 
Phyllanthus acuminatus Vahl, Escuintla, Feb. 19, 19 16, I, 504?; 
San Felipe, Dept. Retalhuleu, Jan. 13, 1917, O, I, /op. 
The same rust occurs in Costa Rica and on the same host. 
