1918] LONG & HARSCH—PUCCINIA OXALIDIS 477 
sweetish sticky liquid. In the spring when the aecia appear the 
pycnia are blackish brown. 
I. Aecia hypophyllous, seated on pallid to reddish brown spots 
which later become dark brown, crowded in irregular annular 
groups 4-8 mm. across, aecia orange color when fresh, cylindrical, 
I-1.25 mm. high by 0.15 too.2 mm. in diameter, peridium opening 
at apex very irregularly, very slow to open and very tough, seg- 
ments slightly if at all reflexed, usually falling away piecemeal, 
peridial cells not overlapping, in face view irregularly oblong to 
polygonal, 10-17 X 17-27 u, in side view pulvinate 14-17 X 20-24 y, 
inner wall verruculose 2-2.5 u thick, outer wall irregularly striate, 
3-4 mu thick, walls colorless, content of cells orange; aeciospores 
irregularly oval, ovate to subglobose, angular, 10-13 13-17 n, 
average for ten, 11X14.4 4; walls colorless, faintly verruculose to 
smooth, 1.5—2 u thick, pores indistinct. 
On Berberidaceae: Berberis repens from New Mexico as follows: Bear 
Canyon by R. M. Harsch, July 7, 1915 (no. 5554);' by Bartholomew and Long, 
June 22, 1917 (no. 6281), material used for inoculating Oxalis violacea plants; 
by Long. August 2, 1917 (no. 6284); Tejano Experiment sop by Long and 
Seay, June and July 1916 (nos. 6005, 6006, 6021, 6097); by Long, July 1917 
(no. 6285), material obtained by inoculating Berberis sists September 20, 
1916, with teliospores of Puccinia oxalidis from Oxalis violacea July 1917 
(no. 6286). 
II. Uredinia hypophyllous, subepidermal, in irregular to 
orbicular groups 2-6 mm. across, often confluent and covering 
entire surface of leaf, round, o.1-o.3 mm. across, soon naked, 
at first orange buff and waxy, later fading somewhat and becom- 
ing pulverulent, ruptured epidermis inconspicuous; urediniospores 
globoid or elliptical globoid, 15-20 17-25 4; walls thin, about 
IM, minutely echinulate, germ pores uncertain. 
III. Telia hypophyllous, in orbicular to irregular groups 
2-5 mm. across, often confluent over entire leaf surface, subepi- 
dermal, ruptured epidermis inconspicuous, soon naked, orange buff, 
waxy, round, 0.1-0.3 mm. across. Teliospore ellipsoid to oval, 
12-22 X 17-28 p, rounded or obtuse at both ends, slightly or not at 
all constricted at septum; septum often oblique; walls colorless, 
‘All herbarium numbers cited in this article refer to the herbarium numbers of 
the senior writer. 
