360 A. Barclay — List of the Uredinese occurring ['No. 3, 



from one another, with green normal tissue between them — at least, I 

 could not trace any mycelial connection between them. The secidial 

 fructification consists of groups of secidia on the margins of the leaves. 

 The portions of the leaf blade bearing these quickly wither and dry up 

 after the aecidia ripen. The secidia break through both the upper and 

 lower surfaces of the leaf, but more frequently from the lower. Sper- 

 mogonia of the usual form are frequently present, especially on the 

 petiole when this is affected, and they are placed usually close by the 

 Bide of the aecidia. 



The cecidiospores are pale yellow and very irregular in size and 

 shape, varpng from round to oval, often faceted and irregularly 

 angular. Their average measurements when moistened are 22 x 158 /m- 

 The epispore is finely punctated (Fig. 6, PI. XIII.). Placed in a decoction 

 of cow-dung (Brefeld) several in 24 hours threw out short germinal 

 tubes of an average diameter of 5'3 /a, but the greater number of 

 spores would not germinate. 



The uredospores are oval or pear-shaped and pale yellow in colour 

 (Fig. 7, PI. XIII.). They are produced in little circular yellow pustules, 

 which are situated on both surfaces of the leaf. The external surface 

 of the epispore is beset with prominent tubercles. The moistened 

 spores measured on an average 21 x 17 /a. Placed in a decoction of 

 cow-dung, only two were found to have germinated on the 5th day, 

 whilst those placed in water did not germinate at all (Fig. 8, PI. XIII.). 

 The teletitospores are contained in little black pustules situated close to 

 the sDcidial fructifications. They were produced on both the upper and 

 lower surfaces of the leaf blade, but more frequently on the lower sur- 

 face, as in the case of the aecidia. The spores are dark brown, two- 

 celled bodies, puccinia, easily detached from their beds, breaking off 

 with only a small fragment of stalk adhering (Fig. 9, PI. XIII.). The 

 average measurements of these spores when moistened were as fol- 

 lows : — whole length 31'7 fx ; length of upper cell 158 fx, and breadth of 

 same 22*4 yw, ; length of lower cell 15*8, and width of same 21 /u,. The 

 stalks bearing these spores are from 2 to 2J times the whole length of 

 the spore. Amongst these teleutospores a few uredospores occurred of 

 the characters above given. The teleutospores were sown in a decoc- 

 tion of cow- dung, as well as in water, but they did not germinate. On 

 one occasion, in autumn (November), I found a single leaf of this plant 

 plentifully covered with teleutospore-pustules. I did not succeed in 

 getting them to germinate. 



From want of sufficient material, I could not experimentally de- 

 termine a genetic relationship between these different spores, but the 

 close proximity of the teleutosporic sori to the aecidial fructification and 



