Puccinia Gramineae. 119-. 



It was likewise found by Magnus 5 that two kinds of uredospores 

 occur, the one thin- walled with numerous (up to 9) germ-pores and 

 echinulate, while the other is thick walled, with few (1-3) germ-pores and 

 either smooth or only with a few scattered spines. There were transition 

 forms between the two, and this shows how variable a description might be 

 according to the nature of the spores regarded as typical. 



(Plate III., Fig. 24.) 



Festuca. 



41. Puccinia festucae Plow. 



Plowright in Gard. Chron., p. 42 (1890) and Grev. XXL, p. 



109 (1893). 



Sydow, Mon. Ured. I., p. 752 (1903). 

 Sacc. Syll. XL, p. 194 (1895). 



II. Uredosori mostly on under surface of leaf, but generally present 



on upper as well, causing conspicuous yellow spots on upper 

 surface, minute, oblong to elliptic, scattered or confluent, orange- 

 yellow. 



Uredospores sub-globose to ellipsoid, echinulate, yellowish to 

 orange-yellow, up to 5 scattered germ-spores on one face, 20-25 x 

 16-18 fi. 



III. Teleutosori mostly on under surface of leaf, minute, scattered or 

 often in groups and confluent, oblong to linear, brownish-black. 



Teleutospores at first intermixed with uredospores, clavate to 

 cylindrical, brown, smooth, slightly constricted at septum, generally 

 tapering towards base, 40-60 X 15-20 ^u, often 60 X 16//; upper 

 cell more or less truncate and thickened at apex, surmounted 

 by a crown of 4-6 obtuse, straight or curved, sometimes bifid 

 processes ; lower cell generally elongated wedge-shaped ; pedicels 

 persistent, brown, stout, 15-25 ^ long. 



X. Mesospores very common, similarly coloured to teleutospores, clavate 

 to cylindrical to somewhat oblong, thickened at apex and sur- 

 mounted by processes, 31-46 x 11-14 p. 



On Festuca ovina L. 



Victoria Leongatha, July, 1903, II. III. 

 On F. rigida Kunth. 



Victoria Rutherglen, Nov., 1895, II. 



In 1890 Plowright experimentally proved that the aecidium on Honey- 

 suckle (Lonicera) was genetically connected with this species, and it has 

 since been repeatedly proved by Fischer and Klebahn. 



(Plate IL, Fig. 13.) 



Stipa. 



42. Puccinia flavescentis McAlp. 



McAlpine, Proc. Linn. Soc. N.S.W., XXVIIL, p. 558 (1903). 

 Sacc. Syll. XVIL, p. 380 (1905). 



II. Uredosori on upper surface of leaf, minute, linear, often confluent, 

 soon naked, p ulverulent, rusty brown, arranged along furrows of leaf. 

 438. E 



