178 KEY. R. ABBAT ON HEMILEIA TASTATKIX. 



protruded through, the stomate. The most immature of the spo- 

 ranges have few or no papillae on them. Sometimes they contain 

 no red granular protoplasm. At other times they are filled with 

 it, as is seen in fig. 9, which represents a cluster of sporanges 

 subjected to pressure until nearly the whole of the sporanges 

 have been detached. Up to the present point only specimens 

 from Ceylon have been described. On diseased leaves from 

 Sumatra I have found a form of growth in connexion with the 

 clusters of sporanges of a very remarkable nature. In PL XIII. 

 fig. 10 is seen a cluster of sporanges similar to those described. 

 To the left there is apparently a remnant of a branch of mycelium 

 attached below to the cluster, whilst all round is a series of trans- 

 parent bodies somewhat resembling the barren cysts in Lecytliea 

 and JSIelampsora, only they are here prolonged into fine tubes 

 divided towards their extremities by a septum, beyond which are 

 minute particles of red granular matter, as seen in PL XIII. 

 fig. 11. It would appear from fig. 11 that there is a tendency to 

 the growth of a new mycelium, which, like the old, contains dark- 

 red granular protoplasm. One of the clusters from which most of 

 the sporanges have been detached after being treated with potash 

 may be seen in fig. 11. The dark-red mass which bears the spo- 

 ranges is of an exceedingly compact character and its structure 

 is very indefinite, some indistinct lines radiating from the centre 

 being alone distinguishable. The attachment of one of the barren 

 cysts is seen in fig. 12. 



When the sporanges have been detached from the mass on 

 which they grow, a portion of the pedicel is sometimes seen to be 

 still attached to them, as in PI. XIV. figs. 1 and 2, the latter re- 

 presenting an immature sporange devoid of papillae. These 

 sporanges vary considerably in shape, apparently on account of 

 the varied pressure to which they are subjected during growth. 

 They are papillated on all sides except the inner or concave sur- 

 face. The sporange itself consists of an outer coat and an inner 

 transparent membrane, which sometimes, but very rarely, become 

 detached from each other entire. More frequently the outer 

 coating disintegrates, and the inner membrane opens out and 

 slowly dissolves away. Generally, however, the outer coating 

 remains, even when immersed in water at a temperature of 90° F. 

 for weeks, and at last falls to pieces, the inner membrane appa- 

 rently disappearing at the same time, or having disappeared pre- 

 viously. The papillae are very minute bodies, pointed at the 



