1887.] in the Neighbourhood of Simla. 353 



invaded by the mycelium are considerably thickened. At an early 

 stage of the affection, patches of pale yellow discoloration may be ob- 

 served on the leaf blades, which are usually convex above. On this 

 upper convex surface, a few spermogonia may be seen, whilst the seci- 

 dial fructification usually emerges from the lower or concave side. The 

 aecidia consist of short tubular peridia filled with reddish yellow 

 spores bursting at their summits in a stellate way. 



The spermoginia are remarkably few and their mouths are sur- 

 mounted by a tuft of paraphyses. 



The aecidial affection above described is met with abundantly 

 throughout the time the plants are in flower, but, as soon as the seeds 

 are being matured, towards the middle or end of May, this affection 

 disappears entirely. After an interval of some weeks from the time 

 the aecidial parasite has entirely disappeared, these plants are seen to be 

 attacked by a teleutospore-bearing mycelium also mainly on the radical 

 leaves, though occasionally also on others. This affection always ap- 

 pears on leaves which bear no trace of formerly having borne the 

 secidial parasite. The spores are extruded from dark brown pustules 

 of minute size, which usually occur in great numbers on each affected 

 leaf. Each pustule is surrounded by a zone of yellow discoloration. 

 At first, these spores are extruded only from the upper surface of the 

 leaf, but later also from the lower surface, exactly opposite the site of 

 the upper spore bed and therefore from the same mycelium. The 

 lower pustule is usually smaller than the upper. At first, when a spore 

 pustule exists only in the upper surface of the leaf, the affected area 

 bulges upwards (convex upwards) with a corresponding concavity 

 below ; but this disappears when the lower surface is also involved in 

 spore extrusion. 



jEcidiospores. — These are abstricted serially from basidia arranged 

 on a flat hymenium. They are pale orange-yellow round or oval bodies 

 measuring, when dry, 17 x 15 /u, and, after lying some time in water, 

 22 X 20 /u, (Fig. 12, PL XII.). The epispore is smooth and unmarked. 

 They do not germinate readily in water (Fig. 10, PI. XIII.). The peridium 

 consists of a layer of single cells. 



Teleutosjoores. — These are brown single-celled bodies — •Uromyces — • 

 borne singly on stalks (Fig. 13, PI. XII.). They are somewhat pear-shaped, 

 measuring when moist 25 X 22 /x, and the stalks bearing them are 

 about twice the length of the long diameter of the spore. The spores 

 are readily detached from their beds without any portion of the stalk 

 adhering to them. The epispore is firm and resistant and a little 

 thickened towards the base, where it joins the stalk. It is sparsely 

 beset externally with tubercles. A few fine paraphyses usually occur 



