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 Pucciiiia Illaginisiana. 

 I'LOWRIGHT, after many infection experiments during 1S82-1885, proved the 

 relation of this Puccinia to the /Ecidium on Riinicx Jiydropathiiin Huds., R. 

 conglomeratimi Älurr., R. obtusifoliuni L., R. crispits I^., and RJ/citm offici- 

 nale Bail. And he also proved on the other hand, that the ./Ecidium on 

 Riiviex acetosa or Ranunculus sps. have no relation at all to this species. 



Puccinia Trailii Plowr. (yEcidium on Runic x 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 Ruuicx doniesticus by the basidiospores of the 

 present species. 



42. Puccinia okatamaensis S. Ito. n. sp. — (i'l. XII. Fig. 2.) 



2V/t7//6'i-(3r/, on the sheath and culm; medium or large sized, oblonger 

 linear, often confluent, gregarious, sometimes 1.5 cm 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/-! in length. 



Hab. On PJtragniitcs coviniunis Trin. 



Hokkaido.— Piov. Ishikari : Okatania ('U. M.nrch :^i, i^yi. K. Mivaüe) ; Ebetsu (III. April 

 25, 1908. S. SuvvA). 



Honsliü. — Prov. Ecliigo : Okawazu (III. April 13, iQOj. K. YosiiiNO). — I'rov. Musa^hi : Toda- 

 liara (III. Nov. 5, 1S99. T. Nish IDA). — Prov. Mino: Gifu (III. March 24, 1S93. S. IIoiu). 



Distrib. Japan. 



Remarks. The species always forms long, conspicuous, confluent sori 

 on the sheath and culm, but not on the blade. Sometimes the sori oi Puc- 

 cinia J\iagnusiana are found together ori the leaf blade of the same jilant. 



The cases of the sorus immersed in the tissue and forming a long line 

 are not found in other related species. Puccinia Phi-agmilis 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- 



