Dec. 1903] Uredineous Infection Experiments in 1903 
229 
PUCCINIA CIRSII-LANCEOLATI Schroet. from 
CARDUUS LANCEOLATUS L. 
This species was described by J. Schroeter, in Kryptoga- 
men-Flora von Schlesien, 317, 1889, (pp. 257-384 published 27 
August 1887), aecidia, uredo and teleutospores being included. 
The Rust on the same host in this country has usually been listed 
as Puccinia cirsii Lasch by American authors, since the aecidial 
stage was not in evidence. Having suitable material for cul¬ 
ture experiments, work was begun with a view of searching es¬ 
pecially for aecidia, March 20th, using as host plants the same 
species which furnished the teleutospores, namely, Carduus lan- 
ceolatus, and many other Composite as indicated in the record 
below. No infections resulted except on Carduus lanceolatus. 
What at the time were somewhat doubtfully supposed to be 
spermogonia, are recorded in my notes, but I could not later 
verify the accuracy of the same; their occurrence is therefore not 
demonstrated and improbable. But a fair number of the pe¬ 
culiar aecidial sori appeared in due time on two or three leaves 
of the host plant. Later, uredo and teleutospores followed. 
Repetitions were not successful — but may have been owing to 
lateness of season when work was carried on. 
When inoculations were instituted specimens were sent to 
European authority, and the supposition that our material should 
be called Puccinia cirsii-lanceolati was approved; specimens of 
European material showing the aecidial stage are now at our 
service for comparison. The testimony is clear that we have to 
do with a Eu-Puccinia; it is autoecious. To avoid the necessity 
of using a ‘round about’ mode of expression when referring to 
the aecidial stage it is proposed to use the terminology as fol¬ 
lows : Aecidinm cirsii-lanceolati. Unfortunately Schroeter’s 
description is so meager as the following for the aecidia: “Ae- 
cidien in kleinen Gruppen zusammengestellt. Pseudoperidien 
sehr locker gefiigt, weit becherformig. Sporen elliptisch mit 
farbloser, feinwarziger Membran und hell orange-rothem In¬ 
halt.” Our material accords in the main with the above — but 
it is being subjected to more careful study and the results, in¬ 
cluding a fuller description, will be published later. Dates of 
cultures, etc., are as follows: 
Exp. 77. March 20. Teleutospores from Carduus lanceolatus L. ap¬ 
plied to Carduus lanceolatus L. Spermogonia (?) on two 
plants appeared March 28 ; aecidia developed April 3 ; uredo 
and teleutospores in considerable abundance were observed 
some time thereafter. (Record for Spermogonia is now con¬ 
sidered incorrect.) 
Exp. 78. March 20. Same to Lactuca virosa L. No infection. 
Exp. 79. March 20. Same to Taraxacum erythrospermum Andrz. 
No infection. 
