UnC INULA 113 



any young perithecia. On the whole, it must be left doubtful for 

 the present, for reasons stated in the preface whether Hydro- 

 pJiylliim appcndiculatiun is really a host-plant of U. genicidata. I 

 have gone fully into the above case because it affords an exact 

 parallel to that of the single occurrence of U. salicis on SaitcUaria 

 lateriflora. 



12. U. POLYCHAETA (Berk. & Curt.) ex. Ellis. [Fig. 89] 



Erysiphc polychacta Berk. & Curt. Grevillea, 4: 159. 1876. 



Uncimda Lynchii Speg. Fung. Argent. Pug. 2 : 17, 44. 1880. 



PleocJiacta Oirtisii Sacc. & Speg., Sacc. Michelia 2 : 373. 



1881 ; Sacc. Syll. Fung. I : 9 (partim). 1882 & Addit. ad vols, i- 



4: 2. 1886. 



Uncinula polychacta (Berk. & Curt.) ex. Ellis in Journ. Myc. 2 : 

 43. 1886 ; Tr. & Gall. Bot. Gaz. 13 : 29 syn. excl. partim. (cum 

 icon.) 1888 ; Massce, Greyillca, 17 : 78. 1889 ; Sacc. Syll. Fung. 

 9 : i^'j. 1 891 ; Atkins. Journ. Elisha Mitch. Sci. Soc. 7 : 6^. pi 

 I. f. S, II- 1 891 ; Burr. ; Ell. & Everh. N. Amer. Pyren. 18. 

 1892. 



Exsicc: Rav. Fung. Carol. Exsicc. fasc. 4, 68 & Ell. & Everh. 

 N. Amer. Fung. 21 13, sub U. polychacta Berk. & Curt.; *Seym. 

 & Earle, Econ. Fung. 149 ; *Speg. Dec. Myc. Argent. 39. 



Hypophyllous ; mycehum dense, forming irregular whitish 

 patches, or completely evanescent ; perithecia gregarious on the 

 patches of mycelium, or when these are absent, scattered over the 

 surface of the leaf; rounded-lenticular, very large, 215-320 [x in 

 diameter, averaging 255 ;/, cells obscure, appendages very numer- 

 ous, usually about 200, closely crowded, ^-^ the diameter of 

 the perithecium, smooth, thick-walled with the lumen more or less 

 completely obliterated, simple, colorless, narrowed upwards to the 

 closely uncinate apex, aseptate ; asci very numerous, 34-66, 

 cylindrical or subcylindrical, rarely oblong, more or less abruptly 

 attenuated into an evident stalk, 70-84 x 20-26 n\ spores 2-3, 

 (very rarely 4), 26-30 x 12-14 fi. 



Hosts.— Aphananthe aspcra, Celtis occidcntalis, C. tala, C. 



Mississlppiensis, Celtis sp. (Chinese). 



Dlstridution.—AsiA : China (Yunnan), Japan. 



North America : United States— South Carolina, Alabama, 



Mississippi. 



South America : Argentine (Buenos Ayres). 



