174 



Puccinia Polygonaceae. 



large, orange, blister-like clusters quite conspicuous against the green of the 

 leaf, and the rust-devouring Diplosis was ^frequently met with there and 

 probably scatters the spermatia. 



The aecidia are usually swarming with the Diplosis, dipping into them 

 as an insect inserts its proboscis into a flower, and sometimes it is entirely 

 inside the cups. The larvae are invariably coated with the aecidiospores. 

 Occur August to October and subsequently. 



Uredospores just beginning to appear in October, and the Diplosis was 

 also found on the sori. 



Teleutospores are scanty in October, and they occur on the same leaves 

 as uredospores. 



The uredo and teleutosori are often associated together in the same 

 cluster, and the three spore-forms may all occur on one leaf. 



(Plate XL, Figs. 88, 89.) 



POLYGONACEAE. 



Rumex. 

 105. Puccinia ludwigii Tepp. 



Tepper, Bot. Centralb., XLIIL, p. 6 (1890). 

 Cooke, Handb. Austr. Fung., p. 336 (1892). 

 Sydow, Mon. Ured. I., p. 581 (1903). 

 Sacc. Syll. XL, p. 196 (1895). 



II., III. Sori minute, circular, irregularly scattered or aggregated into 

 small groups, soon naked and girt by the ruptured epidermis, on 

 both surfaces of leaf, up to J mm. diam. 



II. Uredospores sub-globose to ovate, very finely echinulate, pale 

 yellowish-brown, 22-28 x 16-20 yu, or 19-22 /x diam. 



III. Teleutospores at first intermixed with uredospores, oblong to 

 ellipsoid, rounded at both ends, very coarsely warted, slightly con- 

 stricted at septum, not thickened at apex but generally with 

 hyaline apiculus, sometimes three or four celled, dark brown, 30-40 



x 20-25 ju, average 32 x 21 p; pedicel short, hyaline, deciduous. 



X. Mesospores similarly coloured to teleutospores, warted and with 



hyaline apiculus, oval, with short hyaline pedicel, 28-31 x 18-23 yu. 



On leaves of Rumex brownii Campd. 



Victoria Coromby, Oct., 1889 (Tepper). Shepparton, on river 

 flats, Nov., 1895 (Robinson). Flinders, Jan. Murramurrang- 

 bong Ranges, Dec. Killara, March. Myrniong, Aug. 



Queensland Ennogera (Bancroft). Brisbane, Sept., 1886 

 (Bailey 4 ). 



Tasmania Devonport, January, 1906 (Robinson). 



On Rumex flexuosus Sol. 



Victoria Warracknabeal, Oct., 1903 (Reader) 



I have had plenty of material of this species, both from Victoria and 

 Queensland, as well as some of the original material from Ludwig, and ex- 

 amination shows that it is the same fungus in each case. 



Mr. Bailey kindly supplied specimens from Queensland, and there is one 

 in the National Herbarium, Melbourne, sent from Queensland to Dr. Cooke 

 in 1886, and it is named in his own handwriting P. rumicis Lasch., 

 = P. acetosae (Schum.) Koern. It has the same characters as the others, and 

 on comparing it with P. acetosae from Syd. Ured. Exs., 1163, I find that it 



