Hemmt : On the Die-back Disease of Paulownia tomentosa. j^t 



If-C Conceptaculum ^mto Euvalsa 5g^ JCj^t: {i|Sc7)[^S^:T^iPi3 iC Ltl . ^f- 



schke^'-'^ ^ if^Kii^^Bk:iMKK^^\L Monostichae ^K Circinatae ^^l/f 

 ;fi-^i^^i5t: Macrosporae hf^t^^ ^^KUMto 



-t -C -^mm /2 6 -< ^ ^ Pg S ^ ^ n /2 ^ B m'^m^U ^ ^ ^ f^«/^« Pauloivniae 

 Miyabe et Hemmi. h^^^ b . 'MlM.'X^^W^y^o 



Valsa Paulowniae Miyabe et Hemmi, sp. n. 



Stromata scattered, produced at first under periderm, then erumpent, conical 

 or wart like with round or elliptical bases, grayish-black or brownish-black with 

 many black ostioles of perithecia on the surface ; subcoriaceous, greenish-black or 

 dark-brown in the inside, consisting, at the upper part, entirely of the mycelial- 

 tissue and at the lower part mostly of the host-tissue, with the mycelium inter- 

 mingling in it; average size is about 2-2.5 "^'^^ i'^ diameter at base and 1-2 mm 

 in depth. Perithecia immersed, subglobose with long neck, compactly arranged 

 in concentric circles, about 15 in a stroma, i 50-300 /i in diameter. Asci cylindri- 

 cal or clavate, subsessile or short stalked, 32-52 x 8-10/^ (commonly 44 x 8.8//), 

 hyaline, eight-spored, evanescent in old perithecia ; spores mostly biseriate, some- 

 times irregularly arranged, allantoid with rounded ends, hyaline, 10-18 x 2-4/^ 

 (commonly 14-16 x 3.2 ^«). 



Pycnidia : stromata scattered, produced at first under periderm, then erump- 

 ent, a special flask-like shape, with rounded base; pycnidial cavity single in a 

 stroma, not lobed, forming the base of a stroma, depressedly globose or napiform, 

 about 1.5 mm in diameter and 0.6 mm in depth, thick-walled, with a single exit; 

 pycnospores hyaline, allantoid, rounded at both ends, 2.85-8.75 x 0.88-1.75 « 



