i68 



Puccini a Umbelli ferae. 



UMBELLIFERAE. 



Apium. 

 98. Puccinia thuemeni (Thuemen) McAlp. 



P. castagnei Thuemen, Rev. Myc. II., p. 86 (1880). 



O. Spermogonia on both surfaces of leaf, pale yellow, round, in groups 

 on minute raised yellow spots, about 150 /j. diam. 

 Spermatia hyaline, ellipsoid, 3*5-4 x 2-2-5 /z. 



II. Uredosori amphigenous, bullate, round or ellipsoid, scattered or 



crowded, and becoming confluent, surrounded or partially covered 

 by the ruptured epidermis, pulverulent, cinnamon-brown, 1 mm. or 

 more long. 



Uredospores obovate to ellipsoid, golden-brown, echinulate, with 

 thickened hood-like apex (7-8 /*), and three or four, more or less 

 equatorial germ-pores on one face, 25-38 x 19-22 p, average 30-32 

 x 21 fj, ; the hyaline pedicel may reach a length of 56 ^. 



III. Teleutosori similar to uredosori, dark-brown, also on both surfaces 

 of leaf, but more common on under. 



Teleutospores similarly coloured to and intermixed with 

 uredospores, shortly oblong to ovate-oblong, slightly or not at all 

 constricted at septum, finely warted, rounded at apex, and not per- 

 ceptibly thickened, 29-40 x 16-22 /*, average 32 x 20 p ; 

 lower cell rounded at base or slightly attenuated ; pedicel 

 hyaline, short, deciduous. 

 On stems and leaves of Apium prostratum Labill. 



Victoria Beaumaris, Dec.- July, II., III. (III. in April). 

 Portland, Jan., 1901, II., III. Sandringham, Jan. and Feb., 



1904, II., III. (III., very sparse). Mentone, Jan.-Sept., 



1905, II. III. 



Tasmania Hobart, Sept., 1905 (Rod way). Mersey River, January, 



1906 (Robinson). 

 It may be found in sheltered spots all the year round. 



On Apium graveolens L. 



Victoria Near Melbourne, April-Sept., II. III. 

 Tasmania Hobart, Sept., 1905 (Rod way). 



Very common in the early spring months. 



Spermogonia were only found on the native celery (Apium prostratum) 

 associated with uredospores and teleutospores. 



The germ-pores of the uredospores may be in a transverse band, or one 

 may be placed above the other. When fully developed the uredospores are 

 similarly coloured to the teleutospores, otherwise they are yellowish. On 

 Apium graveolens both uredospores and teleutospores agree almost exactly in 

 average size, though of the latter there are usually very few more than 33 ^t 

 in length. There are occasionally elongated teleutospores which reach a 

 length of 40 j.t. The finely warted epispore is a constant feature of the 

 teleutospores on both hosts. 



The illustrations of spores in PI. IX., Figs. 68-72, show that the rust on 

 the native celery (Apium prostratum), and on cultivated celery (A. 

 graveolens} is the same in Australia. Figs. 73, 74 show the smooth teleu- 

 tospores of P. apii Corda on Apium graveolens from Sydow's Ured. Exsicc., 

 558, which is quite distinct from the finely warted P. thuemeni, and Fig. 75 

 shows the very rough and knobby teleutospores of P. bullata (Pers.) Schroet. 



