73 CONNECTICUT EXPERIMENT STATION REPORT, 



tion. On the stems of :the dead pines, and also somewhat on 

 the living ones, was a conspicuous felt of mycelium of a 

 hymenomycetous fungus which Professor E. A. Burt determined 

 as Coniophora byssoidea (Pers.) Fr. At first we thought that 

 this fungus was responsible for the death of the seedlings, but 

 we were unable to find any account of injury caused by it 

 elsewhere. A bunch of these young pines was kept in a crock 

 in the greenhouse for several months, and there was no indi- 

 cation that the fungus injured the healthy young pines on which 

 it originally occurred, or that it spread further. The fungus 

 evidently ran up on the stems merely as a saprophyte, from 

 various leaves on the ground on which it also occurred. The 

 pines in the seed beds were probably killed by the drought, 

 which was so severe in 1909, and the dead and injured seedlings 

 offered a better condition for the development of the fungus 

 than the surrounding mulch of leaves, as Professor Burt states 

 that out of nine specimens in his herbarium seven are on pine 

 and two on spruce. See Plate XXXV a. 



Frost Injury. Plate XXXV b. In examining the seed beds of 

 white pines at the station plantation at Rainbow in the fall of 

 1910, the writer found small spots scattered in the beds where 

 the leaves of this year's growth had been killed. The injury 

 was evidently caused by the late frosts of May and June of 

 that year, as these had killed the leaves of the scrub oaks in 

 this vicinity, as observed at the time. The young pines had 

 developed their terminal branches an inch or two in length, 

 and these had been severely injured or killed by the frost on 

 both the one- and two-year-old seedlings. The leaves of the 

 previous year remained uninjured. Afterwards these injured 

 pines put out several lateral buds from or below the injured 

 tip, but even as late as November i, when seen by the writer, 

 these had not usually attained a length of half an inch. This 

 injury had severely stunted the growth of the plants during 

 the season, as is indicated by the photograph, which shows 

 one of the uninjured plants, besides several of the injured ones 

 of the same age. A few seedlings of Pinus montana were also 

 injured, but not so extensively as were those of the white pine. 



PINE-CURRANT RUST, Cronartium ribicola Waldh. (I. Peri- 

 dermium Strobi Kleb.) Plate XXXVI a. In our article on Heter- 

 cecious Rusts of Connecticut, published in the Report for 1907, 



