462 PUCCINI A ON GROUNDSEL, 



II. Uredospores — not known. 



III. Teleutospores. — Sori for a long time covered by epidermis, 

 then bursting through and epidermis usually thrown off, or 

 remaining in shreds and patches, intermixed or running parallel 

 with aecidia, black, convex, often confluent in elongated lines, 

 causing swelling of stems, branches, leaves and flower-head stalks 

 and attacking flower-heads. 



Teleutospores chestnut-brown, pedicellate, elongated, slightly 

 constricted at middle, variously shaped but usually elongated 

 clavate; upper cell deep chestnut-brown, rounded or somewhat 

 oval, scoop-shaped or truncated, and thickened at apex, 17-32 x 

 15-25 /x; lower cell usually paler in colour, rounded at base or 

 tapering, often elongated relatively to upper, 18-38 x 12-20^. 



Size of teleutospore, 36-63 x 15-5-25 /x. 



Unicellular and tricellular teleutospores occasionally found. 



Unicellular — elongated oval or somewhat elliptical, apex 

 rounded or pointed and usually thickened, smootli, stalked, 

 varying in colour from pale yellow to golden yellow and chestnut- 

 brown, and sometimes colourless at apex. 29-44 x 13-17^. 



Pedicel colourless, persistent and somewhat longer than spore. 



Tricellular — elongated club-shape, and generall}^ resembling 

 ordinary teleutospores except in size. 48-73 x 22-25 //. 



Pedicels decidedly persistent, pale yellow tint to transparent, 

 sometimes longer than spore, occasionally 63 p., usually stoutish, 

 5 to 9 /i broad. 



Aecidiospores on stems and branches, extending from base of 

 stem to topmost flower-head, on upper and undersurface of leaves. 



Teleutospores on stems, branches, leaf-stalks, leaves and flower- 

 heads. 



On Senecio vnlyarls, L. Aecidiospores all the year round. 

 New South Wales, Victoria, Tasmania. Teleutospores April, 

 Domain, Hobart, Tasmania (Rodway, 64). Aecidiospores almost 

 all the year round and teleutospores, April to July only in Vic- 

 toria. 



I. The average size of the aecidiospores from Victorian speci- 

 mens of Groundsel is rather more than from Tasmanian specimens, 



