ON GRAMINEHX 2538 
the forms which grow upon wild grasses ; according to Eriksson this is 
absolutely true of his “f. sp. Zriticz,” but Carleton found that the uredo 
from wheat would infect certain wild grasses and that the uredo from 
some of them, in turn, would infect the wheat. Most of these races can 
equally infect the Barberry ; yet Wheat-Rust abounds in South Africa, 
Australia and in parts of India, where no species of Berberis are indigenous. 
McAlpine in particular finds P. graminis on 27 species of Graminez, yet 
he was unable to infect the Barberry-plants imported from England, even 
though wheat planted closely around them was covered with the Puceinia. 
He comes to the conclusion that the Wheat-Rust of Australia may be a 
biological race which has lost the power of producing ecidia owing to the 
absence of its zcidial host. According to the evidence at present available, 
this seems also to be the case with other species, ¢.g. the xcidial host is 
not known in Australia for P. Agrostidis, P. bromina, P. Festucae, P. Loli, 
and especially P. Pourum. The latter case is the most striking, since the 
Coltsfoot does not exist in Australia, and the uredospores on Poa have 
been found there all the year round. 
The only practicable remedy for this disease is to plant seeds of 
varieties which have been shown to be immune: a certain progress has 
already been made by Professor Biffen and others in the production of 
these, and McAlpine mentions a variety, “ Rerraf,” which has been found 
to be rust-resistant in many of the Australian States, though it lost that 
power when transferred to other countries. In the year 1889, which had 
a wet and “muggy” spring, the loss due to rust for the whole of Australia 
was estimated to be between two and three million pounds sterling. 
DIsTRIBUTION: In every country of the world. 
118. Puccinia coronata Corda. 
Acidium crassum Pers. Syn. Fung. p. 208 p.p. Cooke, Handb. 
p. 5388; Mier. Fung. p. 196 p.p. 
4G. Frangulae Schim. Pl. Sall. ii, 225. 
-Puccinia coronata Corda, Ic. Fung. 4. 6, pl. 2, f. 96. Cooke, Handb. 
p. 494; Micr. Fung. p. 2038, pl 4, f 60—2. Plowr. Ured. 
p. 163 pp. Sace. Syll. vii. 623 p.p. Sydow, Monogr. i. 699. 
Fiséher, Ured. Schweiz, p. 373, f. 270. 
Spermogones. Epiphyllous or amongst the ecidia. 
cidiospores. icidia hypophyllous or on the petioles, in 
roundish groups or irregularly scattered, on yellow or purplish 
spots, producing distortion especially of the petioles, cylindrical, 
with a white torn revolute margin; spores very delicately 
verruculose, orange, 16—25 x 15—20 p. 
Uredospores. Sori amphigenous, but mostly epiphyllous, 
