226 
S. ITO. 
have also studied about it. This species has been a subject of considerable 
confusion, as it is often found mixed together with Puccinia Magnusiana. 
PLOWRIGHT, after many infection experiments during 1882-1885, proved the 
relation of this Puccinia to the yEcidium on Rumex hydropathum Huds., R. 
conglomeratum Murr., R. obtusifolium L., R. crispus L., and Rheum offici- 
nale Bail. And he also proved on the other hand, that the ASc'idium on 
Rumex acetosa or Ranunculus sps. have no relation at all to this species. 
Puccinia Trailii Plowr. (/Ecidium on Rumex acetosa) differs from the 
present species only in biological characters, the teleutospores of both species 
being exactly the same in general morphological character. 
I successed in infecting Rumex domesticns by the basidiospores of the, 
present species. 
42 . Puccinia okatamaensis S. ltd. n. sp. — (PI. XII. Fig. 2.) 
Teleutosori, on the sheath and culm ; medium or large sized, oblong or 
linear, often confluent, gregarious, sometimes 1.5 gm in length, naked, with 
torn epidermis, compact, thick, prominent, somewhat pulvinate or immersed 
in the tissue, black. Teleutospores, oblong or long fusiform, apex thickened 
(7 — 10//), apiculate or rarely rounded, base attenuated, more or less con- 
stricted at the septum, smooth, cinnamon-colored, 50 — 78x11—20//; epi- 
spore rather thick ; pedicels light yellowish brown, conspicuous at the upper 
portion, thick, persistent, 94 p in length. 
Halb. On Phragmites communis Trin. 
Hokkaido. — Prov. Ishikari : Okatama (III. March 21, I £91. K. Miyabe) ; Ebetsu (III. April 
25, 1908. S. Suwa). 
Honshü. — Prov. Echigo : Okawazu (III. April 13, 1903. K. Yoshino). — Prov. Musashi : Toda- 
hara (III. Nov. 5, 1899. T. Nishida).— Prov. Mino : Gifu (III. March 24, 1893. S. Hori). 
Distrib. Japan. 
Remarks. The species always forms long, conspicuous, confluent sori 
on the sheath and culm, but not on the blade. Sometimes the sori of Puc- 
cinia Magnusiana are found together on the leaf blade of the same plant. 
The cases of the sorus immersed in the tissue and forming a long line 
are not found in other related species. Puccinia Phragmitis forms also an 
elongated teleutosorus on the sheath but is not so gregarious and narrow as 
the present species. While comparing our plant with other species of Puc- 
