The Genus Ravenelia. By M. C. Coohe. 387 



consider them distinct species, tlie length of the component cells 

 and character of protospores must be taken also into consideration : 

 but of this hereafter. (Fig. 4.) 



There are still two other species to be named which differ mate- 

 rially from the foregoing. Ravenelia stictica B. and Br. on leaves 

 of Pongamia rjlahra and Tephrosia suherosa in Ceylon, has sessile 

 capitules, measuring 'OS- '09 mm. diam., with about four cells in 

 each direction. The sterile cysts are small and inconspicuous, but 

 the coloured cells differ from all the rest in having the exterior 

 surface rough with minute warts. (Fig. 7.) 



The last is Ravenelia macrocysiis B. and Br., which has only 

 been found upon Cassia tora in Ceylon. The capitules are convex, 

 surrounded by radiating filaments of mycelium, so that they are 

 perhaps more truly sessile than in any other species. As the name 

 indicates, the coloured cells of which the capitules are composed are 

 unusually large. This is the only species of which hitherto we 

 have seen no specimens. 



Of the eight species, five are found in Ceylon and one in India, 

 so that six are Asiatic, one is exclusively African, and one exclusively 

 North American, the other North American species being also 

 Asiatic. 



In describing one of the Ceylon species in 1873, the Bev. M. 

 J. Berkeley first mentions in connection with that species the 

 presence of other bodies. He writes, " The larger pseudospores 

 are accompanied by Uredinoid bodies which are minutely papillate." 

 About the same time Mr. C. H. Peck remarked with respect to the 

 common North American species, that it was often accompanied by 

 an Ureclo which probably bore the same relation to the larger 

 spores as Trichohasis to Puccinia, and Lecythea to Phragmidium. 

 Some time elapses before exotic species like these can be examined 

 under favourable circumstances, and it is only very recently that 

 we have been enabled to convince ourselves that nearly all the 

 species of Ravenelia are preceded by an Uredo condition, in the same 

 manner as Pucciyiia, Triphragmium, and Phragmidium, thus 

 establishing their affinity. In R. gland uh-vf or mis the protos^wres, 

 or Uredinoid spores, are subelHptical and rough, about • 025 x ' 016 

 mm. (Fig. 2). In Ravenelia Indica they are figured by Berkeley as 

 glol)ose and smooth In R. glabra they are elliptical and rough, 

 • 035 X ■ 012- "015 mm. (Fig. 10). In Ravenelia Hohsoni they lire 

 nearly globose and but slightly granular, •02-"02.')X '015 mm. 

 (Fig. 5). In R. aculeifera we have not as yet met with any proto- 

 spores. In R. stictica glol)Ose and rough, •02.") mm. diam., or sub- 

 globoso, "025 X '02 mm. (Fig. 8). In five species, therefore, proto- 

 sixjres of a yellow or orange colour have been observed, and whatever 

 may be the truerelationsbij»of the protospores to the septate spores 

 in Phragmidium (and this has not as yot been determined) the same 



