TORREYA 



August, 1918 

 Vol.18 No. 72 



KEITHIA ON CHAMAECYPARIS THYOIDES 



By J. F Adams 



The genus KeitJiia was originally established by Saccardo* 

 to include Phacidiiim tetrasporum Phil. & Keith on Juniperus 

 communis. 



Durandt in his discussion of the genus included Stictis Tsiigae 

 Farlow on Tsuga canadensis and a new species K. thujina Durand 

 on Thuja occidentalis . The latter species was collected by Dr. 

 J. J. Davis in Wisconsin, 1908. The genus thus came to include 

 three species which are parasitic on the leaves of Juniperus com- 

 munis, Thuja occidentalis, and Tsuga canadensis. 



Since Durand's paper on the genus Keithia appeared Weirt 

 has reported K. Thujina on Thuja plicata and states that it is 

 widely distributed throughout the range of its host. The same 

 species has been collected on T. occidentalis in Walden, Vermont 

 (July 4, 191 7), by Professor C. R. Orton, which is the first report 

 of the species that far east. 



In the summer of 1915 Professor R. A. Harper and Dr. B. O. 

 Dodge collected a discomycetous fungus on Chamaecyparis 

 thyoides at Lakehurst, New Jersey,. which plainly belongs to the 

 genus Keithia. Material was turned over to the writer for cyto- 

 logical and morphological study and additional material was col- 

 lected June 14, 1916. 



The white cedars that were infected in 19 15 were carefully 

 examined in April, 1916, but no symptoms of infection were 



* Saccardo. Syll. Fung. lo: 49. 1892. 



t Durand, E. J. The Genus Ke///?/a. Mycologia 5: 6-12. 1913. 

 X Weir, J. R. Keithia Thujina, the cause of a serious leaf disease of the Western 

 Red Cedar. Phytopathology 6. 360-363. 1916. 

 [Xo. 7, Vol. 18 of TORREYA, Comprising pp. 127-156, was issued 15 August, 1918] 



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