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П. On the Life-History of а remarkable Uredine on Jasyünum grandiflorum, L. 
(Uromyces Cunninghamianus, nov. sp.) Ву А. BaARCLAY, M.B., Bengal Medical 
Service. (Communicated by G. Murray, F.L.S.) 
(Plates XLIX. & L.) 
Read 16th January, 1890. 
WHILE on a visit to the small village of Sairi, twelve miles from Simla, but at a con- 
siderably lower elevation than the latter (about 4000 feet above the sea-level, Simla being 
about 7000 feet), I found on the 28th and 29th August, 1886, several bushes of Jasminum 
grandiflorum, a wild plant growing in great profusion on the outskirts of the village, 
largely attacked by ап ecidial fungus, which apparently at that time was nearly over, but 
has since proved to be one of exceptional interest. In 1887 I obtained the first speci- 
mens from nature on the 15th July—a few leaves with a few immature patches. The 
æcidial patches were bright yellow, and were found оп the flowers, leaves, and stems; but 
especially frequently on flowering heads, which were then very considerably distorted 
and hypertrophied. The patches on the leaves varied in size from a minute point to 4 
to 5 millim. in diameter and even more (Pl. XLIX. fig. 13, and Р]. L. fig. 1); but some 
were larger and without definite shape, probably formed by the early coalescence of 
originally distinet foci of attack. Опе such irregular patch over the middle of a leaf, 
involving the mid-rib, measured for example 13 millim. in length by 8 millim. in breadth, 
and was deeply concave above. The patches were mostly circular, reddish in colour 
above, and yellow below, and were bulged either upwards or downwards, though more 
frequently convex above. 
The peridia break through from both surfaces of the leaf, but most frequently from 
that surface which is convex. A single leaf bears usually from one to three patches, 
but as many as sixteen were counted in exceptional cases. І should here mention that 
only the young shoots of the present season’s growth are attacked, and never the older 
ones; and the youngest and most tender leaves and shoots are the most extensively 
attacked. 
The secidial patches on young stems or petioles involved either the whole structure 
uniformly (Pl. XLIX. fig. 14), and in that case the whole stem or petiole was uniformly 
hypertrophied, or the mycelium attacked only one side, forming well-defined tumours, 
resembling those I have described in Æcidium Urtice*, though not nearly so large 
(Pl. XLIX. fig. 3). The amount of hypertrophy and distortion caused was often very 
considerable, and the frequent attack of young buds, which were thereby destroyed, is 
* ‘Scientific Memoirs by Medical Officers of the Army of India,’ part ii. pp. 29, 38, 1886. 
SECOND SERIES.— BOTANY, VOL. III. U 
