Micropuccinia. 209 
Puccinia senecionis.. Lib. 
Leleutospores—Sori small, crowded, chestnut-brown, at first hemi- 
spherical, then depressed in the centre, becoming perforate, 
at length pulverulent. Spores irregular in form, subovoid 
or elliptical, lower cell sometimes attenuated, upper gene- 
rally rounded, but often pointed, brown, smooth or granular, 
40-50 X 18-284. Pedicels short, hyaline, deciduous. 
Synonym, 
Puccinia senecionis, Lib. Cooke, “Micro. Fungi,” 4th edit., 
p. 207. 
Lxsiccati. 
Cooke, i. 37; ii. 236. Vize, “ Fungi Brit.,” 21. 
On Senecio aguaticus. 
September. 
BioLocGy.—The mycelium has a great tendency to follow the 
venation. The sori are enclosed in an indistinct pseudoperidium, which 
remains as a honeycomb-like matrix in the centre of the sori-clusters 
after the spores have fallen off. The sori are brown, not black as in 
P. glomerata. 
Puccinia glomerata. Grev. 
Teleutospores—Sori small, black, circinating, crowded, soon pul- 
verulent, in roundish or elongated clusters. Spores elliptical, 
elongated, or irregular, lower cell often smaller, constriction 
slight, upper cell rounded or attenuated, usually surmounted 
by a colourless papilla, smooth or granular when old, dark 
brown, 30-40 X 20-25), 
Synonym. 
Puccinia glomerata. Grev., “Flor. Edin.” Berk., “Eng. 
Flor.,” vol. v. p. 365. Cooke, “ Hdbk.,” p. 500 ; “ Micro. Fungi,” 
4th edit., p. 206. 
Lxsiccati. 
Berk., 220. 
On Senecio jacobea. 
August to November. 
