332 
1.—Tilletia caries Tul. Bunt. On grains of wheat, &e. Tul. 
Anu. Scien. Nat., 1847, VIL, t 5, fig. 1—16. The only 
species. 
| GENUS 170. Ustilago Zk.* 
Plant deeply seated. Spores simple, springing from delicate 
threads, or produced in the form of closely-packed cells, which 
ultimately break up into a powdery mass. 
1.—Ustilago segetum Ditton. Very common on seeds of corn 
and grasses. Tul. Ann. Scien. Nat., 1847, t 3, fig. 1—12. 
2.—Ustilago urceolorum. Tul. On seeds of Carices, near Bristol. 
Tul. Ann. Scien. Nat., 1847, VII., t 4, fig. 7—10. 
3.—Ustilago longissima Tui. On leaves of Poa aquatica, Bath- 
easton. Tul. 1. c. Cooke M. F. t 5, fig. 105—107. 
4.—Ustilago receptaculorum Fr. On receptacles of Tragopogon, 
Bathampton. Tul. 1. ¢. t 4, fig. 1. Four species out of 
fifteen in the “ Outlines.” 
GENUS 117. TUBURCINIA. Fr. t 
Plant deeply seated. Spores multicellular, subglobose or 
conchiform. Cooke M. F, t 3, fig. 54. Neither of two British 
species have occurred here. 
ORDER 16. ACIDIACEL+ 
Peridium distinctly cellular. 
GENUS 172. RASTELEA. £ebd.§ 
Peridium elongated, the component cells at length separating . 
or lacerated. 
1.—Restelia lacerata Tul Grev t 209. On leaves of hawthorn, 
Batheaston. The only species out of three British. 
* Ustilago, from ustulo to scorch. 
} Tuburcinia, from tuburcinor to devour. 
} Keidiacei from Acidium, the typical Genus. 
§ Restelia from raister, a destroyer. 
