222 BROOKLYN BOTANIC GARDEN MEMOIRS 
lamette Valley on the incense cedars planted for ornament and, in 
certain cases, will become a serious menace to cultivated pears and 
quinces. 
The life history of the species was first worked out by Arthur 
(Mycol. 1: 252. 1909; 4: 57. 1912). He succeeded in showing 
that aecia occurred on Crataegus and Amelanchier. ‘The telial material 
used for the cultures was collected at Eugene, Oregon, by Prof. A. R. 
Sweetzer. The writer has also studied this species in some detail 
(Phytopath. 4: 261-269. 1914; Ore. Expt. Sta. Biennial Crop Pest 
Rep. II: 204-212. 1915) and has reported the results of culture 
work and field observations. Similar work is also briefly reported by 
O’Gara (Science N. S. 39: 620-621. 1914). The previous records of 
the occurrence of this species on Malus floribundus Siebold and Sorbus 
sambucifolia Roem. made by the writer (1. c.) should be corrected to 
read Pyrus toensis and S. aucuparia respectively. For the correct 
determination of these hosts the writer is indebted to Prof. W. W. 
Eggleston. 
This species has since been successfully cultured in the greenhouse 
on Pyrus sinensis by Prof. H. P. Barss. The writer, using aecial 
material on quince, the result of infection experiments made in 1914, 
has obtained sparing infection on Libocedrus resulting in telia which 
matured in February 1915. The trees were kept in the greenhouse 
at the Oregon Agr. College. 
36. GYMNOSPORANGIUM HARKNESSIANUM (Ell. & Ev.) Kern, Bull. 
Ne Y Bot Gandy 440- “Tort: 
Roestelia Harknessiana Ell. & Ev. Kern, Bull. Torrey Club 34: 
A462: 1907. 
On MALACEAE: I. 
Amelanchter alnifolia Nutt.—Redmond, Crook Co., July 2, 1914, 
1303, Fort Rock, Lake €o,, Oct. 10, 1915, Wendover, 3375. 
This very interesting species has otherwise been reported only 
from northern California. The telia form is unknown. In the col- 
lection made by the writer listed above, the aecia occurred only on 
fruits and twigs. There was every evidence that this fungus is 
perennial. Some of the specimens show fresh aecia on branches having 
four annual rings, surrounding or extending from cankered areas 
bearing evidence of old aecial cups. There is slight hypertrophy. 
The branches are frequently girdled and killed. 
37. GYMNOSPORANGIUM JUNIPERINUM (L.) Mart. Fl. Crypt. Erlang. 
Ba2, LSi7: 
Tremella juntperina L. Sp. Pl. 1157. 1753. 
