Arthur: Uredinales of Porto Rico 
193 
made by Hohvay at Kingston, Jamaica, Feb., 1915, 22 s, all three 
showing uredinia and telia. 
A specimen collected by Charles Wright in “ Cuba orientali, 
1856-7,” which is in the Curtis set at Harvard University, is 
labeled “ Uredo gemmata B. & C., var.” Through the kindness 
of Dr. W. G. Farlow I have been able to study this collection and 
believe it to be identical with the material on which Uromyces 
gemmatus B. & C. was founded, which was stated to be “ on the 
underside of leaves of Convolvulus etc.” With the aid of Mr. 
Percy Wilson of the New York Botanical Garden the host has 
been determined with certainty as Jacquemontia nodiflora. The 
fungus consists of uredinia only, and agrees exactly with the de- 
scription given by Sydow (Ann. Myc. 6 : 138. 1908), said to have 
been taken frorn a part of the type material, and also with the 
uredinia in the fine set of specimens collected by Dr. Stevens. A 
full description is given to aid in making the species better 
known. 
Pycnia epiphyllous, few in small groups on somewhat dis- 
colored spots, inconspicuous, subepidermal, globoid-flask-shaped, 
65-135/* broad by 96-170 /* high; ostiolar filaments 25-30/* long. 
Aecia uredinoid (primary uredo), chiefly hypophyllous, cir- 
cinate about the area occupied by pycnia, round or oblong, often 
confluent, otherwise like the uredinia. 
Uredinia hypophyllous, scattered or sometimes grouped, round, 
about 0.5 mm. across, soon naked, cinnamon-brown, somewhat 
pulverulent, ruptured epidermis noticeable ; urediniospores ellip- 
soid or obovoid, 24-27 by 31-35/*; wall cinnamon-brown, moder- 
ately thick, 2-3 /*, prominently echinulate, the pores about 6, 
scattered. 
Telia hypophyllous, similar to the uredinia but somewhat 
darker in color, often arising in the same sori ; teliospores ellip- 
soid or obovoid, 23-29 by 32-43/*, rounded above, somewhat 
narrowed below ; wall cinnamon-brown, thin at sides, i /*, greatly 
thickened above, 7-20 /*, smooth; pedicel nearly of quite colorless, 
thin-walled, one half to once length of spore. 
The Uredo Jacquemontiae P. Henn. from New Guinea is de- 
scribed as having considerably larger spores, with wall 5-7 /* 
thick, echinulate with hyaline points i /* long, and is clearly dis- 
tinct from the West Indian form. 
