Phragmidium Rosaceae. 187 



Teleutospores were found germinating on the living plant. The promy- 

 celium was stout and consisted of four cells with a basal cell, the contents 

 being greyish like the sporidiola. The sporidiola are subglobose and 7-8 p 

 diam. 



This fungus does considerable damage to the native raspberry, causing 

 the leaves to fall prematurely. 



(Plate XXVI., Figs. 234, 235 ; Plate I., Fig. 38.) 



Rubus. 

 123. Phragmidium longlssimum Thuem. 



Thuemen, Flora, p. 379 (1875). 



Cooke, Handb. Austr. Fung., p. 340 (1892). 



Sacc. Syll. VII., p. 750 (1888). 



Hamaspora longissima Koern. Hedw. XVL, p. 23 (1877). 



II. Uredosori hypophyllous, scattered or gregarious, or even confluent, 



clear orange, surrounded by a dense layer of paraphyses. 



Uredospores globose or obovate or shortly elliptical, pale yellow, 

 with thick epispore, 16 ^ diam. 



III. Teleutospores on both surfaces of leaf, agglutinated in long fila- 

 ments up to 6 mm. long, rather gelatinous when moist, but when 

 dry twisted up and silky-fibrillose, 4 to 6 celled, commonly 4-celled, 

 yellowish to cream-coloured, containing granular protoplasm, 

 cylindric acuminate, with apex sharply pointed and hyaline, 

 110-190 x 12-15 fj.', pedicel hyaline, tapering gradually towards 

 base to a fine point, hollow, just slightly narrower than spore, 

 10-12 /A broad, and reaching a length of 500 /.i. 



On leaves of Rubus moluccanus L. 



Queensland Eudlo Creek (Bailey 9 ). 



This species was first observed on Rubus in S. Africa, and destroys 

 the foliage of one of the blackberries indigenous to Queensland. Bailey 

 kindly sent me specimens in which the teleutospores are germinating in 

 situ. 



Scattered over the leaves are groups of silky-looking twisted filaments, 

 and OH being teased out are seen under the microscope to consist of innumer- 

 able spores with their long pedicels inextricably blended. 



The germinating spores are seen to have one germ pore in each cell, and 

 the order of germination is basipetal. The promycelial branches are stout, 

 elongated, and transversely septate, and they may either all arise on one 

 side of the spore, or partly only on one side. The promycelial spores are 

 subglobose, finely warted and 9-10 ft diam. 



The teleutospores were very commonly 140 /< long, and one 6 -celled in- 

 dividual attained a length of 190 p. As might be expected in such a long 

 and variously septate spore there is considerable difference in the lengths 

 recorded. It was originally given as 200-240 /<, then Massee reduced it to 

 70-130 n, and in the Queensland specimens I have found it to be 110-190 p. 

 The stalks are excessively long, and they may reach a length of 500 f.i 

 or more. 



The teleutospores agree with those of Phragmidium in being three or 

 more transversely septate, but they are agglutinated together into a 

 gelatinous cylindrical filamentous mass, and each cell only possesses one germ 

 pore. 



