Classification . 203 



spores forming a hollow sphere witli the wall irre- 

 gularly perforated here and there, 20-50 /^ diameter; 

 resting-spores firmly agglutinated together, spheri- 

 cal or subangular, smooth, pale olive or brownish, 

 4-5 /x diameter. 



BoYosporium scabies, Fischer de Waldheim, Aper^u, 

 p. 83 ; Sacc. Syll. vii. ii. n. 1879. 



Tuhercinia scahies, Berk. Journ. Roy. Hort. Soc. 

 1846, V. i. p. 33, figs. 30—31 ; Plow. Brit. Ured. and 

 Ustilag. »p. 294; Cke. Hdbk. p. 510; Cke. Micr. 

 Fung. t. iii. p. 54. 



(Type in Herb. Berk., Kew.) 



On potato tubers. 



The spore-clusters are very peculiar resembling in 

 miniature the young, partly expanded receptacle of 

 Clathrus cancellatus. 



APPENDIX. 



Species considered by some authors as showing 

 affinity with the Ustilaginem. 



Tuberculina, Sacc. 



Sporodochium minute, plano-pulvinate, often more 

 or less violet, at length becoming indurated and 

 sclerotiform ; gonidia globose or nearly so, acrogenous, 

 gonidiophores rather thick, simple or with a few short 

 branchlets. 



Tuberculina, Saccardo, Michela, vol. ii. p. 34 (April, 

 1880); Plow. Brit. Ured. and Ustilag. p. 299; Sacc. 

 Syll. vol. iv. p. 663. 



TJredinuIa, Speg. Fung. Argent. Pug. ii. p. 15 

 (May, 1880). 



