294 British UredinecB and Ustilaginece. 



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 lacunae, generally attached 

 laterally by a slender thread, olive." — Berkeley. 



Synonyms. 



Erysibe subterranea, Wallr. Regens., Bot. Zeit., 1S46, p. 119. 



Protomyccs tuberum solani. Martius's Die Kartoffel Epid., 1842, 

 p. 28, t. ii. figs. 9-13 ; t. iii. figs. 36-38. 



lubercinia scabies. 'S>qxV.., Jour. Royal Ho rt. Soc, 1846, vol. i. 

 p. 33, figs. 30, 31 ; An?i. Nat. Hist., No. 489. Cooke, "Hdbk.," 

 p. 516 ; " Micro. Fungi," 4th edit., p. 231, t. iii. fig. 54. 



Exsiccati. 

 Cooke, i. 445. 



On potatoes {Solamini ttiberosujn). 



I am unacquainted with this species. In my copy of Cooke 

 Exs. I can find no spores. 



LOASSANSIA. 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 

 X 8-1 o/x. Promycelial spores abundant, cylindrical. 



Synonym. 

 Doassansia alismatis. Cornu, Ann. Sc. N'at., 6th series, vol. 

 XV. p. 285, t. 16, figs. 1-4. Trail., Scot. N'at., Januar}-, 1884, 

 p. 124. Schrot., loc. cii., p. 286. 



