Arthur: Uredinales of Porto Rico 
21 
Kuntze {Cynodon Dactylon Pers.), (Poaceae), Rio Pie- 
dras, June ii, 1915, II, /oop, Mayagtiez, June 16, 1915, II, 
7114. 
146. Uredo pustulata P. Henn., on Stenorrhynchus lanceolatus 
(Aubl.) Griseb. (Orchidaceae) , Las Marias, July 10, 19 i 5 > 
818^. The first record of this species for North America, 
hitherto known only in Brazil. 
147. Uredo Guacae Mayor, on Epidendrum difforme Jacq. (Or- 
chidaceae), Jejome Alto, July 17, 1915, 8434, Bandera, 
July 15, 1915, 8669. The same rust was collected on Epi- 
dendrum rigidum Jacq. at Summit Pass, south of Cayey, 
P. R., January, 1911, by E. W. D. Holway. It has not 
before been recognized as a part of the North American 
flora. 
148. Uredo venustula sp. nov. 
Uredinia hypophyllous, scattered, oblong or linear, o. 1-0.2 mm. 
broad by 0.3-0.8 mm. long, early naked, chestnut-brown, rup- 
tured epidermis evident ; paraphyses numerous, prominent up- 
right, clavate-capitate, 16-20 by 40-55 the wall chestnut-brown 
above, paler below, 1.5-3 /a along the stalk, 6-10 n above; uredi- 
niospores broadly ellipsoid or globoid, 18-23 by 22-27 /x; wall 
light chestnut-brown, 1-1.5/x thick, closely and finely echinulate, 
the pores quite distinct, 4, equatorial. 
On Poaceae: 
Andropogon brez’ifolius Sw., Las Marias, July 10, 1915. 
8147. 
A distinctive rust, with prominent sori, due to the great abun- 
dance of very dark paraphyses. The species is similar to Uredo 
Kaernbachii P. Henn., on Andropogon Schoenanthus, known only 
from the Bismark archipelago in the south seas. The color and 
size of both urediniospores and paraphyses are not materially dif- 
ferent in the two forms, but the West Indian species has much 
thinner walls to the spores, and the sori are more prominent. 
Although both are on tropical grasses of wide distribution, yet 
they belong to different sections of the host genus, or to different 
genera according to some authors. 
149. Uredo Olyrae P. Henn., on Oplismeniis hirtellus (L.) R. 
& S. (Poaceae), Las Marias, July 10, 1915, 8118. The 
