728 CONNECTICUT EXPERIMENT STATION REPORT, 1909-1910. 



HORSECHESTNTJT, JEsculus sps. 



POWDERY MILDEW, Uncinula flexuosa Pk. This mildew was 

 found on a species of ^Esculus with colored blossoms, on an 

 estate at Chapinville in the fall of 1909. The conidial stage 

 formed a conspicuous whitish coating on the upper surface of 

 the leaves, while the perithecia were less prominent, though 

 abundant, on the lower surface. The fungus has not been 

 reported by us before, though Thaxter collected it in New 

 Haven in 1888 on another Cultivated species, ^Esculus Hippo- 

 castanum. 



MONKSHOOD, Aconitum Fischeri. 



STEM ROT, ? Hypochnus sp. In our Report for 1907, page 351, 

 we described this stem rot, which was found on a variety of 

 herbaceous plants in a local nursery. This year it was sent 

 to us from Westbrook, where it was injuring specimens of 

 larkspur, one of the hosts reported before. Since our first 

 report we have also found it on monkshood, in the same nursery 

 where it was found originally. So far we have been unable 

 to identify the fungus, as our cultures form only the sclerotial 

 stage small, reddish, usually subspherical bodies about 2 to 

 5 mm. in diameter. We have a similar fungus from potato 

 stems, forming considerable small sclerotia, that was given to 

 us by Morse of the Maine Station. While in Japan, we saw 

 in Professor Hori's laboratory artificial cultures of a number 

 of these sclerotial fungi, which he had described as species 

 of Hypochnus, though we are not sure of this identification 

 from what we have learned concerning them. 



PINE, Pinus sps. 



PINE-OAK RUST, Cronartium Quercus (Brond.) Schroet. 

 (I. Peridermium cerebrum Pk.) On specimens of jack pine, 

 Pinus Banksiana, in the nursery of the station forest plantation 

 at Rainbow in the spring of 1910, Mr. Filley, and later the 

 writer, collected the I stage of this fungus. These seedlings 

 were about four years old, and had been brought in 1908 from 

 Michigan, where no doubt they were originally infected, as 

 this fungus in none of its stages has ever before been found 

 in this state. The fungus on the pine forms conspicuous 



