118 A Monograph of the Erysiphaceae 



U. aitstmlis is apparently distinct from U. salicis in the 8-spored 



asci. 



15. U. Delavayi Patouill. [Fig. 88] 



U. Delavayi Patouill. Journ. de Bot. 2: 217 {cum icon.). 



1888; Sacc. Syll. Fung. 9: T,6y. 1891. 



H}'pophyllous ; mycelium evanescent ; perithecia subgrega- 



rious, i-ounded-lenticular, 9S-1 36 fx in diameter, cells large, 15-20 

 p. wide, appendages very few, 6-12, usually shorter than the di- 

 ameter of the perithecium, rarely slightly exceeding it, simple, 

 stout, y-^ IX wide near the base, hyaline, thin-walled and enlarged 

 at the apex, becoming thick-walled, refractive and sometimes rough 

 towards the base, usually slightly curved throughout their length, 

 colorless, aseptate ; asci 4-1 1, broadly ovate or oblong, very 

 shortly stalked, 58-68x34-38 jx; spores 6 

 22 X 10-12 fx. 



Host. — Ailantlius sp. 



o- 



Dist) 



— Asia : China (Yunnan). 



Of a distinct habit in the short, stout, usually curved appen- 

 dages, not exceeding 12, and usually about 8 in number. U. Dd- 

 avayi is most nearly allied to U. Scngokui, which differs in the 



more numerous, crowded appendages, not or scarcely enlarged 

 upwards. 



I am indebted to M. Patouillard for a specimen (now in the 

 Kcw Herbarium) from which the above description w^as drawn up. 



M 



16. U. AusTRALiAXA McAlpine. [Figs. 94, 95] 



U. Australiana McAlpine, Journ. Linn. Soc. N. S. Wales, 24 : 

 302.//. ^j./. 5-p. 1899. 



Amphigenous ; mycelium persistent or subpersistent ; perithecia 

 usually gregarious in patches on the mycelium, sometimes more 



90-140 



o- 



s 7-20, usually about 1 2, about equal - 

 img me ammeter ot tlie perithecium, rarely i j^ times the diameter, 

 I -septate and colored pale- or dark -brown at the base (sometimes 

 one here and there aseptate and colorless), simple, smooth, thin- 

 walled, narrowed upwards when young, not enlarged upward w^hen 

 mature, about 5 ix wide in the upper half, apex usually helicoid ; 

 asci 3-5, broadly ovate to subglobose, with or without a short 

 stalk, 42-50 X 30-40 ,«; spores 5-7, rarely 8, 20-22 x 10-12 «. 



