294 British Uredinee and Ustilaginee. 
BIOLOGY.—The affected plants are taller and more slender in their 
form. In May and June they produce conidia on the under sides of 
their leaves. The stems are blackened by the presence of spores 
beneath the bark (see also p. 96). 
Tubercinia scabies. Berk. 
“Spores subglobose, composed of minute cells, forming together 
a hollow globe, with one or more lacunz, generally attached 
laterally by a.slender thread, olive.”—Berkeley, 
Synonyms. 
Erysibe subterranea, Wallr. Regens., Bot, Zeit., 1846, p. 119. 
Protomyces tuberum solani. Martius’s Die Kartoffel Epid., 1842, 
p. 28, t. il. figs. 9-13 ; t. iii. figs. 36-38. 
Lubercinia scabies. Berk., Jour. Royal Hort. Soc., 1846, vol. i. 
P. 33, figs. 30, 31; Ann. Mat. Hist., No. 489. Cooke, “ Hdbk.,” 
p. 516; “ Micro, Fungi,” 4th edit., p. 231, t. ili. fig. 54. 
Lxsiccati. 
Cooke, i. 445. 
On potatoes (Solanum tuberosum). 
Iam unacquainted with this species. In my copy of Cooke 
Exs. I can find no spores. 
DOASSANSIA. Cornu. 
Spores in dense masses, surrounded by an investment of sterile 
cells, not pulverulent, germination as in Entyloma. 
Doassansia alismatis. (Nees.) 
Spots rounded, yellowish, crowded with brown dots, on the leaves 
and stems. Spore-balls very numerous, 3 mm. across. Teleu- 
tospores roundish or polygonal, pale brown, smooth, 10-15 
xX 8-10. Promycelial spores abundant, cylindrical. 
Synonym. 
Doassansia alismatis. Cornu, Ann. Sc. Nat. 6th series, vol. 
xv. p. 285, t. 16, figs. 1-4. Trail., Scot, Mat, January, 1884, 
p. 124. Schrot., Zoe. cét., p. 286. 
