[Vol. 2 



650 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Parasitic in leaves, young shoots, and flowers of various 

 ericaceous hosts, and stimulating the infected parts to the 

 production of leaf, shoot, or flower galls which bear the 

 fructifications on their surface. Leaf galls are usually some- 

 what reddish on the upper side and bear the fructification on 



the lower side. 



From Newfoundland to Florida and westward to California 

 and Washington, also in Jamaica. 



I have referred here, with some doubt, the Exobasidium 

 causing yellow-buff leaf spot galls on Rhododendron albi- 

 florum, collected on mountains in Washington by W. N. Suks- 

 dorf. The basidia are 20-30x6 /i, with 4 prominent sterig- 

 mata; the basidiospores are mostly 18-21x4^-6 pi, and are 

 nearly all 3-septate. Some of these spores are germinating, 

 hence the septation of the spores may possibly be due to their 

 over maturity when collected, combined with weather condi- 

 tions at that time favorable to germination. Other collections 

 which show the full series of gall forms on this host are desir- 

 able and should give the needed information in regard to sep- 

 tation of the spores. 



Specimens examined: 



Exsiccati: Ellis, N. Am. Fung., 107, 722; Ell. & Ev., N. Am. 

 Fung., 1586a, 1586b, 1718, 2312a, 2312b; Ell. & Ev., Fung. 

 Col., 220, 1210; Bartholomew, Fung. Col., 1728, 2729, 3231, 

 3232, 3323, 3324, 3429, 3430, 3523 ; Seymour & Earle, Econ. 



Fung., 137a, 137b, 137c, 487, 488, 489; Shear, N. Y. Fung., 

 117; De Thuemen, Myc. Univ., 115, 210, 1110, 1808; 

 Eriksson, Fung. Par., 286b ; Jaczewski, Komarov & Tranz- 

 schel, Fung. Rossiae Ex., 72 ; Kunze, Fung. Sel. Ex., 302 ; 

 Krieger, Fung. Sax., 62, 665, 768; Rabenhorst, Fung. Eur., 

 1910 ; Romell, Fung. Scand., 38. 



Austria : On Rhododendron ferrugineum, Tyrol, P. Magnus 

 (in Mo. Bot. Gard. Herb., 4988). 



Germany: On Vaccinium vitis-idaea, Konigstein, Krieger, 

 Krieger, Fung. Sax., 62 ; Bavaria, De Thuemen, Myc. Univ., 

 910; on Rhododendron ferrugineum, P. Magnus; on Vac- 

 cinium Myrtillus, Leipzig, G. Winter, De Thuemen, Myc. 



