1900] _ CULTURES OF UREDINE4 IN 1899 273 
May 4, Teleutospores from A. furcatus sown on Cnothera biennis; no 
infection. : 
May 15, AXcidiospores from P. pubescens sown on A. scoparius,; May 20, 
uredo 
8. PUCCINIA ANGUSTATA PA. 
The detection of the zcidium of this common rust on Scirpus 
was also due to a fortunate observation. It was noticed that 
some plants of Lycopus, growing within a few feet of Scirpus 
atrovirens covered with last year’s teleutospores, were well 
besprinkled with ecidia (4cidium Lycopi Ger.), while plants 
some distance away were free. Sowings of ecidia were made on 
the leaves of the Scirpus and characteristic uredo obtained. The 
hint was secured so late in the season that only one sowing was 
possible, but the result is thought to be measurably reliable. 
May 23, AE cidiospores from Lycopus Americanus sown on Scirpus atrovirens ; 
June 6, uredo. 
g. Puccinta WINDSORIZ Schw. 
This rust occurs, often in great abundance, upon the much 
benamed grass, Triodia cuprea (Sieglingia seslerioides Scrib.), 
which in the days of Schweinitz was standing in the genus Wind- 
soria. The name of the rust was applied in Burrill’s Parasitic 
Fungi of Illinois fourteen years ago, to the very different rust on 
Muhlenbergia, hence great confusion has arisen, and in nearly all 
recent lists and treatises the name is misused. 
The hint that led to successful cultures came from an obser- 
vation upon proximity, as in the previous cases. A small shrub 
of Prtelea trifoliata was made conspicuous by the bright yellow 
Spots of 4cidium Ptelee B. & C., and not ten feet away was a 
large clump of the grass with the dead stems and leaves black 
with teleutospores. Successful sowings of ecidiospores were 
made on the grass, but the season by this time had advanced so 
far that germinating teleutospores were no longer obtainable 
with which to try the reverse cultures. The dates are as follows: 
May 15, Teleutospores sown on Ambrosia trifida ; no infection. 
May 17, Teleutospores sown on Wapea dioica, no infection. 
June 8, AEcidiospores sown on Triodia cuprea ; June 15, uredo. 
June 16, “Ecidiospores sown on Triodia cuprea ; June 23, uredo. 
