114: A Monograph of the Erysiphaceae 



Very distinct in the large perithecia — the largest in the genus 

 the closely crowded short appendages, more or less attenuated 

 upwards into the small closely involute apex, and the very numer- 

 ous 2-3-spored asci. 



U. polychacta has been recorded hitherto only from America, 

 but specimens sent to me as " Uncimda adtinca Lev. sur Celtis, 

 Yunnan, China (leg. Delavay)," by M. Patouillard prove to be- 

 long to the present species, and so give an interesting extension to 

 the range of this species hitherto supposed to be endemic to 

 America. Whilst agreeing in all other respects, the Chinese 

 specimens differ in having asci which are regularly 3-spored; in 

 American examples the asci, in my experience, are nearly always 

 2-spored, with rarely a rudimentary third spore present. Tracy 

 and Galloway (362), however, in their remarks on the American 

 plant, say "spores usually two, oval, subhyaline, nearly filling the 

 ascus. Sometimes three or even four spores are found in an as- 

 cus. When three occur in an ascus, two are of nearly the usual 

 size, and the third quite small, and when four occur all are small." 

 It would thus obviously be unsafe to separate in any way the 

 Chinese from the American plant. 



Since the above remarks were written Prof Miyabe has sent 

 me a plant named ''Uncimda n. sp. related to U. polychacta, but 

 trisporous. On Aphanauthe aspcra, Tokyo, Japan, October 29, 

 1895 (K. Sengoku)." In this Japanese example most of the asci 

 are 3-spored, although they may be frequently found only 2- 

 spored, and the fungus is evidently to be referred to U. polychacta. 



It is necessary to keep the specific name polychacta for the 

 present species. It was described as Erysiphe polychacta Berk. & 

 Curt, and stands first on the same page where Uncimda polychacta 

 Berk. & Curt, was published. The latter species has been re- 

 named U. confusa by Massee. 



The genus Plcochacta Sacc. and Speg. Michelia 2 : 373. 1881 

 must be rejected, being founded on young examples of the present 

 species m which the appendages were immature and without the 

 uncinate apex. Ellis (116) and Massee (238) have pointed this 

 out, and Saccardo himself has, in the Sylloge, 9 : 367. 1891 

 withdrawn the genus. {Plcochacta, however, is still kept up in a 

 subsequent paper by Saccardo (3 1 3) published in 1 896 and in the 



