Un'cinula 109 



Very variable in the size of the perithecia and number of the 

 appendages, but easily recognized by the abruptly undulated 

 upper half of the appendages (Fig. 8^) and the usually 8-spored 



asci. 



Saccardo's description of U. flcxiiosa, ''peritheciis 80-90 /i d., 

 appendicibus 15-25 '' applies only to the small form of the spe- 

 cies, such as, for instance, the specimen in the Kew Herbarium 

 from South Carolina (*'C. H. P., 192''), where the perithecia arc 

 frequently only ^o fx in diam., \vith 25 or fewer appendages. 

 Peck and Saccardo compare U. flextiosa with U. salicis, but there 

 is no close relationship between these two species, and it Is U, 

 Clintonii that is undoubtedly the nearest ally to the present spe- 

 cies. The small forms of U. flexitosa, mentioned above, approaches 

 certain examples of U. Clintonii very closely, and can only be 

 separated by the — In this form— slightly-undulated appendages, 

 which are shorter, and by the 8-spored asci. 



10. U. Clintonii Peck. [Figs. 81, 82] 



r 



U. Clintonii Peck, Trans. Albany Inst. 7: 216./. 13-15- 

 1872; Peck, Reg. Rep. 25: 96. 1873; Sacc. Syll. Fung, i : 7. 

 1882; Burr.; Ell. & Everh. N. Amer. Pyren. 15. 1S92. 



Exsicc. : Ell. N. Amer. Fung. 662 ; *Seym. & Earle, Econ. 

 Fung. 105 ; *Rab.-Wint.-Pazsch. Fung. eur. 4051 ; *E11. & 



Everh. Fung. Columb. 413. 



Hypophyllous, or amphigenous ; mycelium usually evanescent, 

 sometimes sub-perislstent ; perithecia gregarious or scattered, 80- 

 130 /i in diameter, rarely only 64-86 /^ (on Zdkai'd), cells rather 

 irregular in shape, 10-20 ,« wide; appendages IO-35, or rarely as 

 few as 7, usually about 20, 1-2, rarely 2^^ times the diameter of 

 the perithecium, often unequal in length on the same perithecium, 

 simple, colorless or sometimes brownish-amber at base, refractive, 

 thick-walled and often rough below, smooth, thin-walled ^ and 

 swollen above, measuring 20-30 /i across the simply uncinate 

 clavate apex; asci 4-10, or 2-4, usually 3 (on ZMofa),hroad]y 

 ovate to subglobose, very shortly stalked, 40^62 x 34-40 /i. ; 

 spores ^-2, usually 5-6, more or less crowded in the ascus, 20 

 -25 X 10-13 /I. 



Hosts.— Aphananthc aspcra, Tilia Americana, Zelko^-a acinm- 



nata. 



Distribution.— Asix : (on Aphananthc and Zclkoi'a) Japan. 



