240 FUNGOID PESTS OF CULTIVATED PLANTS. 



The later pustules are brown, small, dot-like or elongated, covered by 

 the epidermis. Teleutospores generally irregular in form, often elliptical 

 or ovate, with a smooth epispore, pale brown (17-25 x 25-40/<), on long 

 and rather persistent pedicels. 



Some authors consider this a form of Uromyces Dactylidis, otherwise 

 called Uromyces graminum, and perhaps they are right after all. 



It has a wide European distribution. 



Plowr. Brit. Urcd. p. 131 ; Sacc. Syll. vii. 1939. 



Sweet Grass Eust. 

 Puccinia Anthoxanthi (Fckl.). 



This is one of the recently recognised species which occurs on 

 Anthoxanthum odoratum. At present no cluster-cups have been asso- 

 ciated with it. 



The pustules of the uredo are either elliptical or linear, and of a dusky- 

 orange, soon exposed. Teleutospores in very small pustules, which are 

 mostly linear, and dark brown. Spores either elliptical or almost pear- 

 shaped. Upper cell thickened at the apex, or a little apiculate, lower cell 

 rounded, rarely wedge-shaped, smooth, of a chestnut-brown colour 

 (25-40 x 15-20/u), on long persistent pedicels. 



Eecognised in Britain and Germany. 



Plour. Brit. Ured. p. 194 ; Sacc. Syll, vii. 2300. 



This and the two following, with two or three others enumerated in 

 this work, are of such doubtful value as species, that we have not 

 attempted to give figures, since the distinctions relied upon for their 

 discrimination are not morphological, but are dependent upon some 

 feature in their life-history. We may be wrong, but we are fain to 

 believe that features which are too subtle to be portrayed by the pencil 

 should scarce be recognised by the pen. 



Foxtail Grass Rust. 

 Pucciuii perplexans (Plowr.). 



This parasite is developed on Alopecurus pratensis, and owes its name 

 and existence to the discovery of what are believed to be its cluster-cups 

 found on 1 lanunculus acris ; hence it is a creation of experimental culture, 

 and not of definite morphological character. 



The pustules of the uredo are oblong or rounded, sometimes confluent 

 and linear, of a golden-yellow. I'redospores globose, oval or somewhat 

 ovate, finely spinulose, and orange (20 25x30-35//). 



The final pustules are small, sometimes round, but generally elongated 

 or linear, covered by the cuticle, often in clusters, sometimes confluent, 

 black. Teleutospores very irregular in form and size, either club-shaped, 

 spindle-shaped, or oblong; upper cell rounded, either truncate or pointed, 

 often obliquely ; lower cell mostly wedge-shaped, clear brown 

 MO G0x 10 12/x), on short pedicels. 



Ai pit scut only recorded as British. 



Plowr. Brit. Ured. p. 179 ; Sacc Syll. vii. 2207. 



