ORGANIZATION OP THE TELIAL SORUS IN THE PINE 
RUST, GALLOWAYA PINICOLA ARTH 1 
By B. O. Dodge 
Pathologist, Fruit-Disease Investigations, Bureau of Plant Industry, United States 
Department of Agriculture 
INTRODUCTION 
The short-cycled pine rust now commonly referred to as Gallowaya 
( 2 ) 2 was first reported under the name Coleosporium pini by Galloway 
(9), who later ( 10) described its effects on the host Pinus virginiana. 
Although he was not fully aware of the exact nature of the germina¬ 
tion of the teleutospores, he figured in some detail various stages in 
the development of the elements of the sorus and brought out some 
of the most characteristic features of the fungus. The writer was 
enabled to make a further study of the fungus from material furnished 
by W. W. Diehl, who collected quantities of the rust for him in the 
viciility of Washington, D. C. It will be shown that there is formed 
a distinct and persistent peridial buffer structure which functions 
in rupturing the leaf tissues overlying the young sorus and that, 
following cell fusions, teleutospores are borne in chains. The spores 
are not sessile in the sense that only one spore is cut off from a basal 
cell as in Coleosporium. Neither does the basal cell bud to form 
the spores as in Puccinia. , , T 4 
THE GAMETOPHYTIC ELEMENTS 
As no one had questioned the results of Galloway’s infection work 
in demonstrating that the rust is short-cycled, it was to be expected 
that the cells of the mycelium in the pine leaf would be uninucleated. 
This is clearly the case. The hyphae are readily stained, although 
the waxy nature of the ypung sorus renders it difficult always to get 
good fixation of later stages. Each cell contains a single nucleus 
(fig. 1, B). 
Vestigial spermogonia are to be found occasionally, but the host 
tissues above them (pi. 1, A) are not fully ruptured and spermatia 
are seldom formed. The few spermogonia seen in the sections were 
located beneath stomata. This may be of no significance, as they are 
rather broad and the stomata are scattered along parallel lines on the 
flat side of the leaf. The weft of hyphae just below the base of the 
primordium is a little denser than that which is to produce a telium. 
The end cells which are somewhat enlarged send out smaller branches 
which converge slightly so that they appear to be directed toward the 
stomatal opening. Galloway’s Figure 10 (10) might very well have 
been drawn from a section of a spermogonium. 
1 Received for publication Nov. 13,1924; issued December, 1925. 
2 Reference is made by number (italic) to “Literature cited,” p. 651. 
Journal of Agricultural Research, 
Washington, D. C. 
( 641 ) 
Vol. XXXI, No. 7 
Oct. 1, 1925 
Key No. G-503 
