Brachypuccinia. 183 
Exsiccati, 
Cooke, i. 73; ii. 54. Vize, “Fungi Brit.,” 64, 147; “ Micro. 
Fungi Brit.,” 323. 
On Carduus arvensis, April to November. A variety occurs 
on Centaurea cyanus. 
BIoLOGY.—The life-history of this fungus has been worked out by 
Rostrup. The first generation consists of roundish uredospores, 
spermogonia, and sometimes a few stray teleutospores. The mycelium 
invades the whole of the infected plant, and hybernates in the upper 
part of the root-stock, so that every shoot sent up from this root con- 
tains the mycelium, and bears spermogonia and the primary uredo 
(= Uredo suaveolens, Pers.). The affected plants appear sooner than 
the healthy ones, have a sickly pale-green colour, and do not bear 
flowers. The second generation consists of uredospores and teleuto- 
spores, and has only a localized mycelium (=P. odtegens, Fckl.). The 
variety on Centaurea cyanus was first described by Magnus, who 
does not consider it a distinct species, but that it is modified by the 
host-plant. It is in this country not very rare on cultivated Centaureze 
in gardens. I have gathered it in the public park at Aberdeen, and 
the Rev. Canon Du Port has also sent me specimens. 
Puccinia bullata. (Pers.) 
Spermogonta—Honey-coloured, in small roundish clusters. 
Uredospores—Sori on small, roundish, pale-brown spots, roundish 
on the leaves, elongated on the stems, sometimes circinating. 
Spores ovate, generally attenuated below, with two lateral, 
markedly thickened germ-pores. Membrane ochraceous, echi- 
nulate, thickened and hooded above, contents pale reddish, 
23-35 X 20-25p. 
Teleutospores—Sori roundish, or more often elongate, dark brown. 
Spores elliptical or clavate, rounded above, often attenuated 
below, apex slightly thickened, smooth, brown, 30-40 X 20— 
25u. Pedicels deciduous. 
Synonyms. 
Puccinia buliata (Pers.). Schrot., “Krypt. Flor.,” vol. iii. 
p. 335. Winter in Rabh., “Krypt. Flor.,” vol. iii. p. 191. 
Uredo bullata, Pers., “ Obs. Myc.,” vol. i. p. 68. 
Uredo ecidiiformis. Grev., ‘‘ Flor. Edin.,” p. 441. 
