120 A Monograph of the Erysiphaceae 



Host, — Fraxbms loitgicuspis. 



Distribution, — Asia : Japan (Sapporo, K. Miyabe, Sept., 



1893)- 



Among the collection of Japanese Erysiphaceae Professor 



Miyabe sent me specimens of the above plant under the mss. name 

 of U.fraxini, As it appears to be a distinct species hitherto un- 

 described, I have drawn up the above description from the mate- 

 rial sent. Professor Miyabe sent the following notes with the 

 specimens : " U. fraxini n. sp. Perithecia 82—98 // ; appendages 

 11-20, 170-225 fi long, slender; asci (6) 30 x 45-49 /^> ^" 

 spored ; spores 14-15 X j—^ju 



U. fraxvti may be known by the evanescent myce 

 line and thin-walled appendages, and the 8-spored asci. 



j> 



18. U. Sengokui sp. nov. [Figs. 64-68] 



Amphigenous ; mycelium evanescent, or subpersistent, very 

 thin and effused over the upper surface of the leaf; perithecia sub- 

 gregarious or scattered, 98-135 a in diameter, cells 10-15 /^ wide ; 

 appendages more or less crow'ded, 20-36, equally or (usually) 

 slightly exceeding the diameter of the perithecium, simple, color- 

 less, aseptate, or occasionally i -septate, stout, 7-8 /i wide in the 

 low^er half, not or scarcely enlarged upwards, often curved through- 

 out their length, hyaline abov^e, becoming refractive and thick- 

 walled at' the base; asci 7-12, ovate to broadly ovate, usually 

 shortly stalked, 48-58 x 30-34 «, spores 5-6, 18-20 x 10/^. 



Host. — Cclastrus articulatns. 



Distribution. — -Asia: Japan (Komaba, Tokyo, October, 1895, 

 K. Sengoku). 



Among the collection of Erysiphaceae sent to me from Japan 

 by Professor Miyabe, the above species of UncinuJa appears to be 

 n^\\\ Its affinity is undoubtedly with U. Delavayi^ but the more 

 numerous crowded appendages not or scarcely enlarged upwards 

 easily distinguish the present species. 



U. Sengokui^ except for the absence of color in the appendages, 

 much resembles certain Japanese forms of U. 7iccator. 



From all forms of U. CHntonii, the present species may be dis- 

 tinguished by the wider base of the appendages. 



