ARTHUR: NEW SPECIES OF UREDINEAE 121 
Uredo biporula sp. nov. 
II. Uredinia hypophyllous, chiefly scattered or somewhat 
gregarious, orbicular, 0.2—-0.3 mm. in diameter, soon naked, pul- 
verulent, dark cinnamon-brown; urediniospores triangular-obo- 
void, 21-23 by 23-26 w; wall dark cinnamon-brown, I-2 yu thick, 
moderately and finely echinulate, the pores 2, basal, and close to 
the hilum. 
On Salvia fulgens Cav., Amecameca, Mexico, October 31, 
1899, E. W. D. Holway 3758. This collection, in which the ured- 
inia are abundant and conspicuous, shows the unique character 
among Salvia rusts of two basal pores in the urediniospores. 
Uredo amicosa sp. nov. 
II. Uredinia hypophyllous, scattered, bullate, 0.2-0.4 mm. 
in diameter, opening by a central pore; paraphyses thickly im- 
bricated, the united bases forming a tissue-like lining to the sides 
of the sorus, the long free ends cylindric or fusiform-cyclindric, 
10-16 by 67-112 , acuminate or acute, the wall colorless, thick- 
ened to nearly or quite obliterate the lumen; urediniospores 
epedicillate, angularly oblong, ellipsoid, or obovoid, 23-34 by 
40-60 u; wall golden-brown, 2-3 u thick, sometimes twice as 
thick at apex, sparsely and strongly echinulate, the pores obscure, 
possibly 3 or 4 and equatorial. 
On Chrysophyllum Cainito L., mesas near Mayagiiez, Porto 
Rico, March 29, 1917, H. E. Thomas 264. There are many 
sapotaceous rusts, but this one on the common star apple of the 
tropics seems to be different from any heretofore described. The 
rather conspicuous sori are abundantly scattered over the under 
side of the leathery leaves. The spores may possibly be catenu- 
late, as no pedicels can be detected, either attached to the spores 
or at the bottoms of the sori. Two species of Uredo have been 
described on undetermined species of Chrysophyllum from Brazil, 
but both of them have much smaller spores and quite different 
sori, judging from the descriptions, no specimens having been seen. 
They are Uredo chrysophyllicola P. Henn. (Hedwigia 41: 106. 
1902) and U. Chrysophylli Sydow (Hedwigia 49: 78. 1909). 
i Uredo ignava sp. nov. 
II. Uredinia amphigenous, numerous on light brown dis- 
colored areas, roundish or oblong, 0.2-0.6 mm. across, pulverulent, 
