454 NOTES ON UROMYCES AMYGDALI, COOKE, 



the form under consideration. His Uromyces amygdali is simply 

 the uredo-stage of Puccinia p^'uni. 



Description. 



It only remains now to conclude with a description of the 

 fungus as found in Australia. 



Uredosj>ores. — Sori hypophyllous, small, light brown to rusty 

 brown, roundish, scattered but grouped in patches, often con- 

 fluent, soon naked, pulverulent, seated on yellow^ spots corres- 

 ponding to those on upper surface. 



Uredospores variable in form, from elongated-ovate to almond- 

 shaped, usually shortly stalked, but sometimes 22 ^ in length, 

 closely echinulate, yellowish, apex yellowish-brown, thickened, 

 with spines less prominent, bluntly conical or rounded, with at 

 least two opposite germ-pores situated just* behind thickened apex, 

 26-44 X 12-20 /i, intermixed with numerous capitate, jDale yellow, 

 long-stalked paraphyses, sometimes attaining a length of 60 /x. 



Teltutoayores. — Sori scattered or confluent, isolated or in 

 groups, punctulate, puh^erulent, seal-brown, known from the other 

 by their da,rk almost black apjDearance. 



Teleutospores composed of two spherical cells, apparently 

 flattened at their junction, lower usually smaller and paler than 

 upper, but sometimes similar in size and colour, sharjDly con- 

 stricted in the middle and cells readily separating. Epispore 

 uniformly thick, dark l)rown, thickly studded with short stout 

 ■spikes, 25-37 X 17-21 /x. Pedicels short, hyaline, deciduous or 

 persistent, from 4 to 8 ju long. 



On leaves of j^each, nectarine, plum, apricot and almond, and 

 occasionally on fruits of peach and apricot : December to June. 

 New South Wales, Victoria, Queensland, 8. Australia and 

 Tasmania. 



Synonyms. 



Puccinia ]rni7ii-i<pinosf8, Pers. (1797). 

 Uredo pru7iastri, DC. (1805). 

 Puccinia prunor nil), Link (1825;. 



