208 
S. 1TO. 
TRANZCHEL (i) asserts that Puccinia on Poa nemoralis has no connection 
whatever with the vEcidium on Pctasitcs officinalis. 
In our Flora, Tussilago Farfara is not present. On Pctasites japonicus, 
however, the aecidial stage is very commonly found ; and in the vicinity of 
such an infected plant, there occur frequently different species of Poa badly 
attacked by Puccinia Poanmi. It is not unreasonable, therefore, to believe 
in this case in' the possibility of the relationship existing between two forms 
of rust fungi. In our country, no infection experiments have yet been made 
to prove their genetic connection. 
The JEcidium on Pctasites in our country agree in general characters to 
that on Tussilago in Europe ; and in the present paper, I have considered it 
provisionally as a stage of Puccinia Poarum. 
I got, from Mr. T. MIYAKE, a Saghalien specimen of zEcidium on 
Pctasites japonicus. It was found mixed with the sori of Puccinia expansa 
Link. But as Puccinia expansa belongs to Hemipuccinia, having no aecidial 
stage, and moreover as the Saghalien ./Ecidium coincides exactly with that 
of Hokkaido in their morphological character, it may well be regarded as a 
stage of Puccinia Poarum and not of Puccinia expansa. 
The uredosori of Puccinia Poarum are distinguished from those of other 
related species by the presence of characteristic capitate paraphyses. 
As it has been remarked by Lagerheim and Carleton, the uredo- 
spores of this species hibernate also in our country. In Sapporo, on Poa 
annua , only the uredospores seem to be formed and the teleutospores so far 
have never been observed. The uredospores in this case are formed 
throughout the year from early spring to late autumn and even under the 
snow in winter. 
The teleutospore of our plant is slightly larger than that of the European 
form ; but in other points they agree exactly. 
In 1903, DlETEL (7) regarded the Uredo on Poa pratensis , collected by 
Mr. Nambu at Nishigahara, as a different species from that of the present 
plant. I have no specimen in my hand which correspond to Dietel’s 
description. 
I have collected in our Botanical Garden a specie? of Puccinia, much 
reesmbling the present species, on Dcschampsia caespitosa, introduced by 
