294 



Journal of Agricultural Research 



Vol. V, No. 7 



made on injured and uninjured plants, which were then covered with bell 

 jars for 4 days. At the end of 12 days most of the plants showed signs of 

 rotting. Unlike the ginseng roots (Pi. XXVIII, figs, i and 2) previously 

 discussed, infection occurred not only on the injured, but also on the 

 uninjured plants. 



Fig. I. — Sderotinia libertiana: A, Camera-lucida drawing showing branched and unbranched paraphyses, 

 asci, and ascospores; B, camera-lucida drawing showing taethods of ascospore germination. Those 

 within the asci germinate by sending germ tubes directly through the walls of the ascus. 



BLACK-ROT OF GINSENG 



Van Hook (1904, p. 1 81-182) first mentions a species of Sderotinia as 

 the cause of a black-rot of ginseng. Rankin (1912) reports the discovery 

 of the apothecia and established a new specific name for the fungus. No 

 inoculations were attempted, either on the ginseng roots or on other hosts 

 known to be attacked by species of Sderotinia closely allied to this one. 



