286 FUNGUS-FLOBA. 



Geotrichum candidum. Link. (fig. 17, p. 313.) 

 Tufts pulvinate, white, rather powdery; sterile hyphae 



creeping, somewhat continuous; fertile ascending, short; 



conidia cylindrical, truncate at both ends, 5-10 x 4, hyaline. 

 Geotrichum candidum, Link, Obs., i. p. 15; Sacc., Syll., 



n. 183. 



On the naked ground, also on damp, rotten paper, 



bones, &c. 



Geotrichum roseum. Grove. 



Hyphae creeping, white, interwoven ; conidia pale rose- 

 coloured, concatenate, shortly cylindrical, ends truncate, 

 16-30 x 9-10 p. or sometimes longer. 



Geotrichum roseum, Grove, Journ. Bot., tab. 266, f. 8 ; 

 Sacc., Syll., iv. n. 185. 



Forming dense small, round or oblong rosy spots at the 

 base of a species of Juncus. 



OIDIUM. Link (emended), (fig. 8, p. 313.) 



Growing on living plants. Mycelium creeping, conidio- 

 phores erect, sub-simple ; chains of conidia soon breaking 

 up ; conidia rather large, elliptical, colourless or coloured. 



Oidium, Link, emended by Saccardo, Mich., ii. p. 15; 

 Sacc., Syll., 40. 



Developing on living plants, chiefly on the leaves. Many 

 species have been proved to be the conidial condition of 

 ascigerous fungi belonging to the Perisporiaceae. 



L On Dicotyledons. 



Oidium erysiphoides. Fr. 



Broadly effused, indeterminate, white; tufts conspicuous, 

 rosy- white ; hyphae almost erect, very slender ; conidia 

 ovate, oblong, pellucid, internally granular, 30-45 x 13-20 p. 



Oidium erysiphoides, Fries, Syst. Mycol., iii. p. 432 ; Sacc., 

 Syll., iv. n. 189. 



On living leaves of various plants. The conidial phase of 

 a species of Erysiphe. 



Oidium leucoconium. Desm. (fig. 8, p. 313.) 

 Tufts broadly effused, white ; hyphae creeping with short, 

 erect, fertile branchlets ; conidia elliptical, 20-30 x 13-16 p.. 



