Puccinia Gramineae. 



Hordeum* 



430 and 



51. Puccinia simplex (Koern.) Eriks. and Henn. 



Eriksson and Henning, Getreider. p. 238 (1896). 

 Me Alpine, Journ. Dep. Agr. Victoria I, pp. 



529 (1902). 



Sydow, Mon. Ured. I, p. 756 (1903). 

 Sacc. Syll. XVII, p. 377 (1905). 

 Puccinia straminis Fckl. var. simplex Koern. in Land und 



Forstwirtsch. Zeit. (1865). 



II. Uredosori very minute or up to ^ mm. long, sparingly scattered 01 



sometimes numerous on both surfaces of leaves, but mostly on 

 upper, citron yellow. 



Uredospores subglobose or ellipsoid, echinulabe, yellow, relatively 

 thick walled, with numerous scattered germ-pores, 4-7 on one 

 face, 21-24 p diam, or 24-30 X 17-20 u. 



III. Teleutosori covered by the epidermis, amphigenous, numerous, 

 minute, punctiform, mostly oblong and confluent, black, somewhat 

 longer on leaf sheath than on leaf, divided into compartments 

 brown paraphyses, often strongly enlarged and thickened towards, 

 the apex and spread out horizontally. 



Teleutospores oblong clavate to clavate, dark chestnut brown, 

 smooth, usually rounded or truncate at apex, or obliquely conical, 

 and slightly thickened at apex, but may sometimes reach 6 p, an<~ 

 slightly constricted at septum, 40-54 X 17-24 p ; upper eel 

 oblong, generally as broad as long, 15-21 X 17-22 p ; lower cell 

 tapering towards pedicel, sometimes quite narrow at base, long* 

 than upper, 21-33 x 15-18 p ; pedicel short, slightly tinted. 



X. Mesospores very numerous, similarly coloured and similarly 

 thickened at apex to teleutospores, asymmetrical, sometim< 

 elongated, saccate or inversely triangular, very variable, 24-45 x 

 15-24/z. 



On Hordeum vulgare L. 



Victoria Port Fairy, Warrnambool, Nov.-Jan. 



This form was first described in 1865 by Koernicke as a variety, but now 

 Eriksson and Henning have raised it to the rank of a species. 



A very characteristic feature of it is the great predominance of unicellub 

 spores. A sorus may consist entirely of these or there may be a few norm* 

 teleutospores intermixed. They are produced alongside the two-celled forms 

 and are quite similar to them except that they are one-celled, and thei 

 evidently show the transition from the one-celled to the two-celled teleul 

 spore. There is usually a slight thickening at the apex of both, but it rareb 

 exceeds 4-6 p. It was early recognised as an exceptional form, and 

 named Uromyces hordei by Nielsen in 1875, and Puccinia anomala by Rostru] 

 in 1876. 



The teleutospores only germinate after a period of rest, according 

 Eriksson and Henning 1 . 



(Plate I, Figs. 1, 4, 9 ; Plate B., Figs. 9, 10.) 



