46 



ved by v. Faber. ') When présent in any quantity Car r u- 

 thers saw the mycélium running in the wood as thin 

 black strands. ^) Like v. F a b e r, I am unable to confirm 

 this statement. 



In order to make a doser study of the fungus it had 

 to be grown artificially. With a stérile knife small pièces 

 were eut from the wood at the borde rs of the diseased 

 and the healthy tissues. Thèse were transferred to a 

 culturemedium in a sterilized dish. In a few days the 

 mycélium came forth from thèse pièces as a pure culture. 

 In this way the parasite could always be easily obtained. 

 Soon a conidial fructification developed; on a septate 

 mycélium appear branched conidiophores, from which oval 

 unicellular conidia are eut off (Fig. 6). I consider the 

 fungus as belonging to the genus Spicaria. 



The branching of the conidiophores is indeed not purely 

 verticillate ; sometimes it is even very irregular (Fig. 7). 

 yet it often is repeatedly trilatéral (Fig. 8 at y) and the 

 conidia form chains. 



Fusion of the hyphae is very common; in old cultures 

 the mycelial cells are so rounded off against each other, 

 that the fungus assumes a Monilia-Wke appearance. The 

 breadth of the hyphae dépends on the culture-medium on 

 which they develop. The size of the conidia may differ 

 considerably, als old and young conidia are found in the 

 same préparations. They measure from 7,5 — 10,5 n by 

 4 fi. In germinating they put out one or two germ-tubes. 



The conidia are developed in the air; in hanging drops 

 none or only a few are produced in the drop, but no 

 sooner has the mycélium grown out of it than they ap- 

 pear in large numbers. 



1) See V. F a b e r, p. 399. 



-2) See C a r r u t h e r s, 1902, p. 442. 



