Puccinia Rosaceae. j^i 



Teieufcospore brownish-yellow, smooth, fusiform to clavate, con- 

 stricted at sepfcam, epispore chestnut-brown, 30-40 x 13-18 u, 

 average 35 x 14 ^ ; upper cell elongated and tapering or 

 rounded, thickened at apex, 18-22 /* long; lower cell elongated 

 and tapering towards base, or bulging, 16-22 /z long; pedicel 

 pellucid, sometimes 54 p long. 



X. Mesospores occasional, coloured like teleutospores, elongated 

 ellipsoid to oblong, rounded and thickened at apex, occasionally 

 somewhat pear-shaped, and the basal portion prolonged like a, 

 stalk, as sometimes happens in the bicellular spore, 28-35 x 

 12-18 p. 



On living leaves of Geum renijolium F. v. M. 



Tasmania The Calf, Adamson's Peak, March, 1895 (Rod way 1 ). 

 The specimen was gathered on an out-of-the-way mountain, at an altitude 

 of nearly 4,000 ft. 



(Plate X., Fig. 82.) 



Prunus. 

 102. Puccinia pruni Pers. 



Persoon, Syn. Fung., p. 226 (1808). 

 Cooke, Grev. XL, p. 97 (1883). 

 Sydow, Mon. Ured. I, p. 484 (1903). 

 Sacc. Syll. VII., p. 648 (1888). 



II. Uredosori hypophyllous, occasionally epiphyllous, minute, light 



brown to cinnamon brown, orbicular, scattered, but often grouped 

 in patches and confluent, soon naked, pulverulent, usually seated 

 on discoloured spots, which also show on upper surface. 



Uredospores variable in shape, oblong to ovoid oblong, ellipsoid 

 to somewhat piriform, closely echinulate, yellowish, with two or 

 occasionally three sub-equatorial germ-pores on one face, apex 

 yellowish brown, thickened (average, 5-6 p, or papillate up to 9 /*) 

 with spines less prominent, bluntly conical or rounded, 25-38 x 

 12-18 jit, occasionally reaching a length of 40 p or more, average 

 30 x 15 /j, ; paraphyses intermixed, numerous, capitate, pale yel- 

 low, long-stalked, sometimes attaining a length of 70 p. 



III. Teleutosori hypophyllous, scattered or confluent, isolated or in 

 groups, very pulverulent, seal-brown, paraphysate, known from the 

 uredosori when fully developed by their dark, almost black 

 appearance. 



Teleutospores at first intermixed with uredospores, dark-brown, 

 oblong to ellipsoid or obovoid, densely warted, often composed of 

 two globose or depressed globose cells, readily separating from 

 each other, very rarely 3-celled, 25-45 x 17-25 p, average 

 36 x 25 p ; upper cell usually darker in colour, and broader than 

 lower, globose or depressed globose, often slightly thickened 

 at apex, and thickly studded with short stout spikes, average 

 16-22 p diam.; lower cell generally oblong to obovoid, and equal to 

 or longer than upper, 14-24 x 14-19 p ; pedicel short, hyaline, 

 deciduous. 



On leaves, fruits and stems of Peach (Prunus persica Stokes). 



On leaves and fruits of Almond and Apricot (Prunus amygdalus Stokes, 

 and P. armeniaca L.). 



