450 NOTES ON UROMYCES AMYGDALI, COOKE, 



to the numerous pustules, which contained teleutospores as well 

 as uredospores (fig. 1:^). Curiously enough the almond leaves 

 sent in June from Ardmona in the Goulburn Valley contained 

 only uredospores and these sparingly, wdiile almond leaves from 

 Netherby in the extreme west of the Colony, but practically in 

 the same degree of latitude, contained both uredospores and 

 teleutospores in al^undance. 



After diligent search in the Royal Horticultural Gardens, 

 Burnley, I cannot find any trace of the fungus on the almond 

 leaves there, and nine different varieties are grown. 



From a comparison of the uredospores and teleutospores on the 

 above different species of Pru7ius, there can be no doubt of their 

 identity or of their being Fuccinia jjruni, Pers. 



Further, the summer-spores (uredospores) are jDroduced in great 

 profusion, commencing as a rule in December and January, 

 succeeded by the winter-spores (teleutospores) in Ma}^ and June, 

 which represent with us the end of autumn and the beginning 

 of winter. In the uredospores the apex is not perforated by a 

 single germ-pore as in Uromyces, but there are at least two lateral 

 germ-pores. The teleutospores as noted in the British species 

 are apt to separate at the septum, so that numerous unicellular 

 spores are often to be seen, which might easily on a cursory 

 glance be mistaken for something else. Hitherto the teleutospores 

 are to be found most plentifully on plum leaves in Victoria, and 

 much more sparingly on the others. 



Germination of Spores. 



Both uredospores and teleutospores have been kept for some 

 time in a moist chamber and only uredospores have germinated. 

 This is in keeping w4th what we already know of this fungus, 

 that it belongs to the group Heitiipncchiia, having uredospores 

 and teleutospores, the latter only germinating after a period of 

 rest. No nutritive solution was used to stimulate germination, 

 only water (fig. 13). 



There was an average temperature of from 10° to 12° C. 



The fate of the teleutospores has not yet been traced. As show- 

 ing the practical importance of studying the life-history of these 



