100 A Monograph of the Erysiphaceae 



rather irregular in shape, 10-20/^ wide, appendages very variable 

 in number and length, 7-32, rarely irregularly crowded and as 

 many as 40, 1-4 times the diameter of the perithecium, smooth, 

 simple, septate, thin-walled, light or dark amber-brown in the 

 lower half, flexuous and flaccid w^ien long, subrigid and straight 

 when shorter, apex more or less helicoid when mature, often 

 strongly so : asci 4-6, rarely 6-9, broadly ovate or ovate-oblong 

 to subglobose, with or without a short stalk, 50-60 x 30-40/^; 

 spores 4-7, 18-25 X IO-12/X 



" Hyphasma, tenuissimum album, floccis valde tenuibus, or- 

 biculatum, non constringens. Sporangiolis minutissimis, raris, 

 fusco-nigris, globosis. Ubi omnino evoluta, etiam haec species 

 destruit uvas ... in uvis Vitis Labniscac varietatibus cultis In 



vineis nostrls '* (Schwein, loc. cit.). 



He 



Koloniik 



Calift 



cordifolia (97) (249), V, flexiiosa, V. hedcracca {Ampclopsis qui?!- 

 quefolia)^ Vitis Labnisca and var. Cataivba, V. riparia (60), V. ru- 

 pcstris (373), V. vinifera. 



Distribution (of perithecial form only). — Europe: France. 

 Asia : Japan. 



North America : United States — M 

 *k, Pennsylvania, Maryland, New Ten 



Wis 



consin, Missouri, Iowa, Kansas, Texas (373), New Mexico, South 

 Dakota (151), California. Canada — Ontario. 



Uncimda meat or is at once known by the colored appendages, 



ry 



The form on 



Uncimda ampdopsidis of Peck iU, subfi 



cfolid) 



at first sight seems to be distinct in the shorter, fewer (7-22) ap- 

 pendages, 1-3, usually 1 1^ times the diameter of the perithecium, 

 not flexuous nor flaccid, and distinctly wider both in the lower 

 half (7-8/^ wide), and towards the apex (S-io /j). These charac- 

 ters are shown by most forms on this host-plant, and were they 

 confined to this might entitle the plant to a varietal rank. But, as 

 most American mycologists now admit, they are not so. In the 

 ordinary examples of U. nccator on Vitis Labnisca^ K vittifera, etc., 

 the long appendages are about 5// wide, flexuous and weak, but 



