48 Bulletin 313 



Venturia in^qualis (Cke.) Aderh. (= Fusicladium dendri- 

 ticum (Wal.) FcL, page 122). — On fruits, twigs and leaves of the 

 apple. Causes spotting and cracking of the fruit and a velvety 

 growth on twigs and under side of leaves. The conidial stage pro- 

 duces blackish-olive velvety patches (sometimes covering the entire 

 lower surface and sometimes on upper surface of leaves and on 

 twigs and fruit), of erect, closely septate brown, mycelium; conidio- 

 phores closely non-septate or 1 -septate, wavy or nodulose brown, 

 50-60 X 4-6 IX ; conidia single, terminal, obclavate, but sometimes 

 irregular in shape, yellowish olive, 30 x 7-9 /x; perithecia maturing 

 in the spring on the old leaves, globose, short-necked, smooth or 

 bristled above, 20-160 fi; asci cylindric, 40-70 fi long; the ascospores 

 yellowish-green, tmequally 2-celled. the upper cell shorter and 

 broader, 11-15 x 4-8 u. 



216. Infected apple leaf. 217. Infected apple. 218. Mycelium from culture, 

 1/12. 219. Conidiophores and conidia from culture. 1/6. 1/12. 220. Conidia 

 from fruit, 1/12. 221. Infected apple t\vips (conidial stage) collected in 

 early spring. 222. Cross-section of same, 2/3. 223. Conidiophores and coni- 

 dia from same, 1/12. 224. Asci, 1/12. 225. Ascospores, 1/12. 



Venturia gaultheri^ E. &- E. — On the leaves of Gaidtheria 

 procumhens. Causes orbicular or irregular dark brown spots with 

 grayish centers, 1/3 mm. in diameter. Perithecia scattered, orbicu- 

 lar, membranous, 75 (x in diameter, with few- black spreading 

 bristles; asci ovate to oblong, slightly curved, 30-35 x 8-11 p.; 

 conidia ovate to oblong, septate, slightly constricted, 3-4 guttulate, 

 slightly curved, hyaline, 11-14 x 3 /a. 



226. Infected leaf of Gaidtheria procumhens. 227. Perithecia, 2/3. 228 

 Asci and ascospores, 1/12. 



Ventura pirina Adler (= Fusicladium pirinum (Lib.) Pel., 

 page 122). 



Leptosph^.ria coniothyrtum (Pel.) Sacc. (= Coniothyrium 

 fuckelii Sacc, page 80). 



