66 BOTANICAL GAZETTE (yur 
The writer has not been able to obtain authentic material of this South Ameri- 
can Ravenelia, nevertheless he is assigning to this species the Texas Ravenelia 
collected on the same host (A. farnesiana), since its characters are practically 
identical with those described for the South American plant. 
RAVENELIA GRACILIS Arth. 
O. Pycnia not found in the Texas material. 
II. Uredinia epiphyllous, seated on slightly pallid areas, scat- 
tered, very small, less than o.4 mm. across, elliptical to irregularly 
oval, tardily naked, subepidermal, ruptured epidermis promi- 
nent; urediniospores ovate, ovate-fusiform to somewhat flask- 
shaped, usual shape ovate-flask-shaped, 15-21 by 30-45 mu, average 
for 20 spores 18.4 by 37.6; walls 2-2.5 uw thick, russet colored, 
sparingly echinulate, apex darker and slightly thickened, germ 
pores 4-6, in equator; paraphyses few, peripheral and also inter- 
mixed with the spores, hyphoid to subclavate, hyaline, walls thin, 
4-7 by 35-50 n 
Ill. Telia ection: similar in size and shape to the uredinia, 
blackish-brown, subepidermal; teliospore heads dark chestnut- 
brown, hemispherical, 60-87 by 37—40 yw thick, average for 20 heads 
73.8 by 39 wu, 5-6 spores across, 8-14 marginal spores, 4-12 inner 
spores, usual number per head 22-24, each spore on lower part 
of head bearing 2-4 small, hyaline tubercles, 2-5 » long, upper 
: portion smooth, or with 1-4 very short tubercles to each spore; _ 
_ cysts in 1 row, subglobose, few, as many as the marginal spores, 
united laterally and extending from periphery to stipe, sub- 
appressed, easily swelling and ome in ee; pedicel short, 
deciduous, colorless. — | 
ay Collected on Havardia brevifolias 6 miles from Brownsville, Texas, neat 
ave Pagans: November 10, 1916, by W. 4. Long | ae 6160). ‘Thndoce 
lyr Ff: ee te > cdliection which 4 
S; Mexico, on an unknown host. Ts . 
Texas, ions le sin to be the same - a 
