260 



ASCOMYCETES. 



larger and four smaller spores, the latter appearing to be rudi- 

 mentary and incapable of germination. 



Scl. baccarum Schroet.^ (Britain).^ The sclerotium disease of 

 the bilberry ( Face. Myrtillus). This varies from the other species 

 in having round conidia incapable of germinating in water, in 

 having more robust apothecial beakers, and in lacking rhizoids. 

 The spores are similar in number and arrangement to the 

 preceding species. 



Scl. megalospora Wor. The sclerotium disease of the crow- 

 berry {Umpdnim nigrum). This species is distinguished by the 



Fio. 138. — Sclerotinia -megalospora on Vaceinimn vMginosum. Partially withered 

 leaf with a white conidial cushion on the mid rib. A, Conidial chains produced 

 on a mycelium, resulting from an artificial culture of ascospores in plum-solution. 

 B, Isolated conidium with remains of disjunctors still attached. C, Twig with 

 upper mummified berry. E, Ascospores ; one in its gelatinous envelope, the other 

 giving off a germ-tube and sporidia. (After Woronin.) 



form of its conidia, and the manner of their germination ; in the 

 form of the sclerotium, and the absence of primordia ; in the 

 absence of rhizoids ; and, particularly, in having large ascospores 

 almost similar to each other. 



The " white berries " of the Vacciniaceae are distinct from the 

 mummified berries caused by Sclerotinia.^ 



Scl. aucupariae Ludw. The mummified fruits of Pyrus 

 Aucuparia, resulting from this fungus, were first observed by 



1 Schroeter, Hedivir/ia, 1879 ; Woronin (loc. cit. ). 



- Sclerotia of this species have been found in Hcothmd by Professor Traill. 

 ^Magnus and Ascherson, Berichte d. deutuch. hotan. Ges., 1889; also ZooL- 

 botan. Ges., Vienna, 1891. 



