Unxinula 107 



ous, 50-160, yi-^i the diameter of the perithecium, simple, 



colorless, aseptate, becoming more or less thick-wallcd through- 

 out, smooth, delicate, 3-4 ii wide, slightly attenuated upwards, 

 apex simply uncinate ; asci 5-8, broadly ovate with or without a 

 short stalk, 50-64 x 34-38 /i ; spores 4-7, usually 6, 20-24 



X IO-I2/i. 



Hosts. — Celds Americana, C. occidcntalis. 



Distribiitiun. — North America : United States — New York, 

 New Jersey, South Carolina, Indiana, Alabama (12), Illinois, Mis- 

 sissippi, Missouri, Iowa, Kansas (386), Washington. " From the 

 Atlantic coast to Washington ; not apparently abundant, but often 

 collected from widely separated localities" (Burrill (60)). 



An interesting species (endemic to North America), distinct 

 from U. salicis in the small perithecia with shorter, more delicate 

 and narrower appendages, which become more or less solid through 

 obliteration of the lumen at maturity. 



8. U. MACROSPORA Pcck 



U. macrospora Peck, Trans. Albany Inst. 7: 215./. 4.-6. 1S72; 

 Peck, R-g. Rep. 25 : 96. 1873 ; Sacc. Syll. Fung. 1:7. 1882 ; 

 Burr. & Earle, Bull. 111. State Lab. Nat. Hist. 2 : 407- 1887; 

 Atkins. Journ. Elisha Mitch. Sci. Soc 7: 66. 1891 ; Burr.; Ell. 

 & Everh. N. Amer. Pyren. 18. 1892. 



U. intermedia Berk. & Curt. Grevillea, 4: 160. 1876; Sacc. 



Syll. Fung. I : 7. 1882. 



Exsicc: Ell. N. Amer. Fung. 426 ; de Thum. Myc. Univ. 

 2053; Rab.-Wint. Fung. Eur. 3244; *Seym. & Earle, Econ. 

 Fung. 154, 156a, 156b; *E11. & Everh. Fung. Columb. 223,414. 



Amphigenous; mycelium evanescent, or subpersistent and 

 pruinose, rarely forming circumscribed patches on the upper surface 

 of the leaf; perithecia closely gregarious In small patches, or scat- 

 tered over the surface, globose-depressed or lenticular, 95-165 ft 



in diameter, averaging ^30 n, cells about 10 /^ wide ; appendages 



numerous-, 50-130 or more, varying in length from }i the diame- 

 ter of the perithecium to a little more than Its diameter, smooth, 

 colorless, aseptate, simple, thick-walled at base, thin-walled above, 

 not or scarceh- enlarged upwards, apex usually simply uncmate, 

 but sometimes subhelicoid ; asci 8-14, rarely 14-20, sub-pynform 



15-18 «. 



