THE FUNGI WHICH CAUSE PLANT DISEASE 581 



arranged, simple, or brarxched; conidia, numerous, in heads 12-15 

 H across, oblong or ovate-oblong, 16-18 x 7-7.5 ii, hyaline or di- 

 lute colored. 



It is reported as the cause of considerable injury to peonies in 

 different parts of the United States. The greenish-black flat 

 sclerotia are found inside the stems. 



It is mentioned by Bos ^^* as parasitic on young peony stems and 

 on lily-of-the-valley and lilac. 



B. longibrachiata Oud.^^^. «« 



White, sparse, cespitose, 1.5-2 mm. high; mycelium creeping, 

 branched; fertile hyphse, verticillate, hyaline, much branched 

 and apically inflated; conidia numerous, hyaline, oval, 4.5-5.5 x 

 2.5 It. 



It was reported by Thaxter ^^ as the cause of stem rot of to- 

 bacco in the curing house. The affected stems are covered with 

 white velvety patches of mycelium which soon spread to the 

 veins. 



The same fungus is reported by Aderhold on ferns. ^^^ 



This is perhaps a form of B. cinerea. 



B. douglassi Tub. on fir may be B. cinerea and =Sclerotinia 

 fuckeliana. See p. 140. 



B. citricola Brizi, closely related to B. cinerea, attacks oranges 

 and citrus fruits resulting in mvunmies. 



B. diospiri Brizi attacks the persimmon fruit near time of ripen- 

 ing and prevents maturity. 



B. patula S. & Ber.^^" 



Cespitose, minute, greyish-white, spots cottony, suborbicular; 

 fertile hyphse assurgent, continuous, filiform, branching, panicu- 

 late; conidia large, globose or globose-elliptic. 30 n in diameter, 

 light yellow. On raspberries. 



B. infestans (Hazsl.) Sacc. is common on hemp in Europe. It 

 sometimes is associated with Sclerotinia libertiana which has led 

 some to assume its connection with that fungus; but no such 

 genetic relation is probable. 



B. galanthina Lud. occurs on snowdrops. It is said to belong to 

 Sclerotinia galanthina, see p. 141, but the asci have not been seen. 



Undetermined species are reported on carnations, Ribes and 

 mangold."" 



