Brachyp7iccinia. 1 8 



J 



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 Centaitrea 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 suavcolens^ 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 ( = /*. obtcgois^ Fckl.). The 

 variety on Ccntaiirca 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 Centaure?e 

 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.) 



Spermogonia — 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 20-25/A. 



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- 

 25/x. Pedicels deciduous. 



Synonyms. 



Puccinia bullata (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 cecidiiformis. Grev., "Flor. Edin.," p. 441. 



