1922] ARTHUR—UREDINALES 63 
17. PUCCINIA ANTIOQUINENSIS Mayor, N.A.F. 347.—On 
Cyperus diffusus Vahl, Sangre Grande, April 1913, III, Thaxter 51. 
18. PUCCINIA ARECHAVALETAE Speg. Ann. Soc. Ci. Arg. 12:67. 
1881.—On Urvillea Seriana (L.) H.B.K., St. Claire, Port of Spain, 
February—April 1913, Thaxter 28. 
19. Puccinia corticola Arthur and Rorer, sp. nov. 
O. Pycnia amphigenous, rather few, seen in groups of 2 or 3, 
inconspicuous, subepidermal, flask-shaped, 74-96u broad by r10- 
115m high; ostiolar filaments agglutinated. 
III. Telia amphigenous and caulicolous, on leaves and young 
twigs, few, scattered, confluent in groups of 6-8 or more, on leaf 
blades rounded, on midribs and stems oblong or lenticular, 
0.2-1.3 mm. long, on trunk and branches much larger, rather early 
naked, dark brown, pulverulent, ruptured epidermis evident; 
teliospores ellipsoid, 19-24 30-424, rounded above and below, 
slightly or not constricted at septum; wall cinnamon or chestnut 
brown, 2-2.5u thick, slightly thicker at apex, coarsely and sparsely 
verrucose, the markings more pronounced above, pedicel ‘colorless, 
fragile. 
On Cordia Gerascanthus L. (Ehretiaceae), Arima Forest Reserve, 
December 1915, Rorer. 
The host, Mr. Rorer writes, is “‘a timber tree, which yields a wood known 
as Cypre. The disease is of economic importance here, as it not only attacks 
the leaves and young twigs, but the older branches as well, and causes large 
lesions on the main trunk of the tree.” Figs. 3 and 4 show the injury to five 
year old trees. This interesting short cycle species is the only rust in Puccinia 
known to attack the trunks and larger branches of trees, although some species 
of Gymnosporangium show such behavior. 
20. Puccinta Evupatortr Diet. Hedwigia 36:32. 1897.— 
On Eupatorium iresinoides H.B.K., Diego Martin, 1913, Thaxter 32. 
21. Puccinta GovantAE Holway, Ann. Myc. 3:21. 1905.— 
On Gouania polygama (Jacq.) Urban, Maraval Valley, March 1913, 
Il, Thaxter 30a; Roxborough, Tobago, May 8-9, 1913, II, iii, 
Thaxter 30b. 
22. Puccinta HELIcONIAE (Diet.) Arth. Bull. Torr. Bot. Club 
45:144. 1918.—On Bihai Pstttacorum (L.) Kuntze (Heliconia 
Psittacorum L.), La Seiva Valley, April 1913, II, Thaxter 11. 
