DISCOVERY OE INTERNAL TELIA PRODUCED BY A 
SPECIES OF CRONARTIUM 
By Reginald H. Colley, 
Agent, Investigations in Forest Pathology, Bureau of Plant Industry, United States 
Department of Agriculture 
INTRODUCTION 
Adams (i) 1 has recently listed the reports of a number of investigators 
who have found rust sori developing internally in the host tissue. Both 
Adams (i) and Wolf (7) fail to mention the work of Bolley and Pritch¬ 
ard (2) and Pritchard (5, 6), who made careful studies of internal sori in 
wheat grains. A review of the literature shows that pycnia, aecia, 
uredinia, and telia have been found iqside the tissue of the host plant, 
producing what were apparently normal spores. Table I summarizes 
all the accounts of internal rust sori which are known to the writer. 
Table I. —Summary of accounts of internal rust sori 
Author. 
Parasite. 
Spore 
stages. 
Host. 
Where located. 
Adams, J. F. (1)... 
Nigredo caryophy- 
llina (Schrank) 
Arthur = Urom- 
II 
Dianthus caryo 
phillus It. 
In leaves. 
Atkinson, G. F., and 
Edgerton, C. W. 
ana Reddick, 
Donald (7). 
Bolley, Henry E., 
and Pritchard, 
F- J- (a)- 
Enksson, J., and 
Henning, E. (5) 
yces caryophili- 
nus (Schroeter). 
Nigredo caladdii 
(Schw.) Arthur 
— Uromyces ca¬ 
laddii Farlow.. 
Puccinia graminis 
tritici E. and H. 
Puccinia gluma- 
rum (Schmidt) 
Eriks, ana 
I 
Hand 
III. 
II and 
III. 
Peltandra vir- 
ginicia (E) 
Kunth. 
Triticum sp.... 
Cereal grains.... 
(?) 
Beneath bran lay¬ 
er and about em¬ 
bryo of seed. 
In pericarp. 
Fromme, Fred D. 
( 4 ). 
Pritchard, F. J. (6). 
Pritchard, F. J. (5). 
Reddick, Donald 
Smith, W. G. (5)... 
Wolf, F. A. (7). 
Henn. 
Puccinia claytoni- 
ata Peck. 
Puccinia graminis 
tritici E. and H. 
Puccinia graminis 
tritici E. and H. 
Puccinia graminis 
Pers. 
Dicaeoma poculi- 
forme (Jacq.) 
Kuntze = Puc¬ 
cinia graminis 
Pers. 
Puccinia graminis 
Pers. 
Puccinia angusta- 
ta Peck. 
0 
Claytonia vir- 
ginica E. 
III 
Triticum sp. 
III 
.do. 
I 
Berberis vulgaris 
E. 
II 
Secale sp. 
III 
Avena sp. 
I 
Lycopus virgin- 
icus E. 
Deep in parenchy¬ 
ma of stem. 
In seed near hi- 
lum. 
In pericarp of 
wheat grain. 
In fruit. 
In stem. 
Next to gluten 
layer of seed. 
In pith and paren¬ 
chyma tissue of 
petioles and 
stems. 
1 Reference is made by number to "Literature cited,” p. 332. 
Journal of Agricultural Research, 
Washington, D. C. 
he 
(3*9) 
Vol. vm. No. 9 
Feb. a6 f 1917 
Key No. G—107 
